mirror of
https://codeberg.org/forgejo/forgejo.git
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740 lines
19 KiB
Go
Vendored
740 lines
19 KiB
Go
Vendored
// Copyright 2015 The Xorm Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package xorm
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import (
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"context"
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"crypto/rand"
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"crypto/sha256"
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"database/sql"
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"encoding/hex"
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"errors"
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"fmt"
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"hash/crc32"
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"io"
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"reflect"
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"strconv"
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"strings"
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"xorm.io/xorm/contexts"
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"xorm.io/xorm/convert"
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"xorm.io/xorm/core"
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"xorm.io/xorm/internal/json"
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"xorm.io/xorm/internal/statements"
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"xorm.io/xorm/log"
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"xorm.io/xorm/schemas"
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)
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// ErrFieldIsNotExist columns does not exist
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type ErrFieldIsNotExist struct {
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FieldName string
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TableName string
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}
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func (e ErrFieldIsNotExist) Error() string {
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return fmt.Sprintf("field %s is not exist on table %s", e.FieldName, e.TableName)
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}
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// ErrFieldIsNotValid is not valid
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type ErrFieldIsNotValid struct {
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FieldName string
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TableName string
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}
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func (e ErrFieldIsNotValid) Error() string {
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return fmt.Sprintf("field %s is not valid on table %s", e.FieldName, e.TableName)
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}
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type sessionType bool
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const (
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engineSession sessionType = false
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groupSession sessionType = true
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)
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// Session keep a pointer to sql.DB and provides all execution of all
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// kind of database operations.
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type Session struct {
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engine *Engine
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tx *core.Tx
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statement *statements.Statement
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isAutoCommit bool
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isCommitedOrRollbacked bool
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isAutoClose bool
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isClosed bool
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prepareStmt bool
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// Automatically reset the statement after operations that execute a SQL
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// query such as Count(), Find(), Get(), ...
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autoResetStatement bool
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// !nashtsai! storing these beans due to yet committed tx
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afterInsertBeans map[interface{}]*[]func(interface{})
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afterUpdateBeans map[interface{}]*[]func(interface{})
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afterDeleteBeans map[interface{}]*[]func(interface{})
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// --
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beforeClosures []func(interface{})
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afterClosures []func(interface{})
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afterProcessors []executedProcessor
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stmtCache map[uint32]*core.Stmt //key: hash.Hash32 of (queryStr, len(queryStr))
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lastSQL string
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lastSQLArgs []interface{}
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ctx context.Context
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sessionType sessionType
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}
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func newSessionID() string {
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hash := sha256.New()
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_, err := io.CopyN(hash, rand.Reader, 50)
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if err != nil {
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return "????????????????????"
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}
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md := hash.Sum(nil)
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mdStr := hex.EncodeToString(md)
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return mdStr[0:20]
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}
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func newSession(engine *Engine) *Session {
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var ctx context.Context
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if engine.logSessionID {
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ctx = context.WithValue(engine.defaultContext, log.SessionIDKey, newSessionID())
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} else {
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ctx = engine.defaultContext
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}
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session := &Session{
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ctx: ctx,
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engine: engine,
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tx: nil,
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statement: statements.NewStatement(
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engine.dialect,
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engine.tagParser,
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engine.DatabaseTZ,
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),
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isClosed: false,
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isAutoCommit: true,
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isCommitedOrRollbacked: false,
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isAutoClose: false,
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autoResetStatement: true,
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prepareStmt: false,
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afterInsertBeans: make(map[interface{}]*[]func(interface{}), 0),
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afterUpdateBeans: make(map[interface{}]*[]func(interface{}), 0),
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afterDeleteBeans: make(map[interface{}]*[]func(interface{}), 0),
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beforeClosures: make([]func(interface{}), 0),
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afterClosures: make([]func(interface{}), 0),
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afterProcessors: make([]executedProcessor, 0),
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stmtCache: make(map[uint32]*core.Stmt),
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lastSQL: "",
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lastSQLArgs: make([]interface{}, 0),
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sessionType: engineSession,
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}
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if engine.logSessionID {
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session.ctx = context.WithValue(session.ctx, log.SessionKey, session)
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}
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return session
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}
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// Close release the connection from pool
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func (session *Session) Close() error {
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for _, v := range session.stmtCache {
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if err := v.Close(); err != nil {
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return err
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}
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}
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if !session.isClosed {
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// When Close be called, if session is a transaction and do not call
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// Commit or Rollback, then call Rollback.
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if session.tx != nil && !session.isCommitedOrRollbacked {
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if err := session.Rollback(); err != nil {
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return err
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}
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}
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session.tx = nil
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session.stmtCache = nil
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session.isClosed = true
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}
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return nil
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}
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func (session *Session) db() *core.DB {
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return session.engine.db
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}
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// Engine returns session Engine
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func (session *Session) Engine() *Engine {
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return session.engine
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}
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func (session *Session) getQueryer() core.Queryer {
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if session.tx != nil {
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return session.tx
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}
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return session.db()
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}
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// ContextCache enable context cache or not
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func (session *Session) ContextCache(context contexts.ContextCache) *Session {
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session.statement.SetContextCache(context)
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return session
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}
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// IsClosed returns if session is closed
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func (session *Session) IsClosed() bool {
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return session.isClosed
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}
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func (session *Session) resetStatement() {
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if session.autoResetStatement {
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session.statement.Reset()
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}
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}
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// Prepare set a flag to session that should be prepare statement before execute query
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func (session *Session) Prepare() *Session {
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session.prepareStmt = true
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return session
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}
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// Before Apply before Processor, affected bean is passed to closure arg
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func (session *Session) Before(closures func(interface{})) *Session {
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if closures != nil {
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session.beforeClosures = append(session.beforeClosures, closures)
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}
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return session
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}
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// After Apply after Processor, affected bean is passed to closure arg
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func (session *Session) After(closures func(interface{})) *Session {
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if closures != nil {
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session.afterClosures = append(session.afterClosures, closures)
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}
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return session
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}
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// Table can input a string or pointer to struct for special a table to operate.
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func (session *Session) Table(tableNameOrBean interface{}) *Session {
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if err := session.statement.SetTable(tableNameOrBean); err != nil {
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session.statement.LastError = err
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}
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return session
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}
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// Alias set the table alias
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func (session *Session) Alias(alias string) *Session {
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session.statement.Alias(alias)
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return session
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}
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// NoCascade indicate that no cascade load child object
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func (session *Session) NoCascade() *Session {
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session.statement.UseCascade = false
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return session
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}
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// ForUpdate Set Read/Write locking for UPDATE
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func (session *Session) ForUpdate() *Session {
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session.statement.IsForUpdate = true
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return session
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}
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// NoAutoCondition disable generate SQL condition from beans
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func (session *Session) NoAutoCondition(no ...bool) *Session {
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session.statement.SetNoAutoCondition(no...)
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return session
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}
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// Limit provide limit and offset query condition
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func (session *Session) Limit(limit int, start ...int) *Session {
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session.statement.Limit(limit, start...)
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return session
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}
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// OrderBy provide order by query condition, the input parameter is the content
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// after order by on a sql statement.
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func (session *Session) OrderBy(order string) *Session {
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session.statement.OrderBy(order)
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return session
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}
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// Desc provide desc order by query condition, the input parameters are columns.
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func (session *Session) Desc(colNames ...string) *Session {
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session.statement.Desc(colNames...)
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return session
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}
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// Asc provide asc order by query condition, the input parameters are columns.
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func (session *Session) Asc(colNames ...string) *Session {
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session.statement.Asc(colNames...)
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return session
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}
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// StoreEngine is only avialble mysql dialect currently
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func (session *Session) StoreEngine(storeEngine string) *Session {
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session.statement.StoreEngine = storeEngine
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return session
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}
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// Charset is only avialble mysql dialect currently
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func (session *Session) Charset(charset string) *Session {
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session.statement.Charset = charset
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return session
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}
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// Cascade indicates if loading sub Struct
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func (session *Session) Cascade(trueOrFalse ...bool) *Session {
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if len(trueOrFalse) >= 1 {
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session.statement.UseCascade = trueOrFalse[0]
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}
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return session
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}
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// MustLogSQL means record SQL or not and don't follow engine's setting
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func (session *Session) MustLogSQL(logs ...bool) *Session {
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var showSQL = true
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if len(logs) > 0 {
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showSQL = logs[0]
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}
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session.ctx = context.WithValue(session.ctx, log.SessionShowSQLKey, showSQL)
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return session
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}
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// NoCache ask this session do not retrieve data from cache system and
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// get data from database directly.
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func (session *Session) NoCache() *Session {
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session.statement.UseCache = false
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return session
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}
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// Join join_operator should be one of INNER, LEFT OUTER, CROSS etc - this will be prepended to JOIN
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func (session *Session) Join(joinOperator string, tablename interface{}, condition string, args ...interface{}) *Session {
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session.statement.Join(joinOperator, tablename, condition, args...)
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return session
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}
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// GroupBy Generate Group By statement
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func (session *Session) GroupBy(keys string) *Session {
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session.statement.GroupBy(keys)
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return session
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}
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// Having Generate Having statement
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func (session *Session) Having(conditions string) *Session {
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session.statement.Having(conditions)
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return session
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}
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// DB db return the wrapper of sql.DB
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func (session *Session) DB() *core.DB {
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return session.db()
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}
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func (session *Session) canCache() bool {
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if session.statement.RefTable == nil ||
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session.statement.JoinStr != "" ||
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session.statement.RawSQL != "" ||
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!session.statement.UseCache ||
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session.statement.IsForUpdate ||
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session.tx != nil ||
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len(session.statement.SelectStr) > 0 {
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return false
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}
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return true
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}
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func (session *Session) doPrepare(db *core.DB, sqlStr string) (stmt *core.Stmt, err error) {
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crc := crc32.ChecksumIEEE([]byte(sqlStr))
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// TODO try hash(sqlStr+len(sqlStr))
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var has bool
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stmt, has = session.stmtCache[crc]
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if !has {
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stmt, err = db.PrepareContext(session.ctx, sqlStr)
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if err != nil {
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return nil, err
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}
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session.stmtCache[crc] = stmt
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}
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return
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}
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func (session *Session) getField(dataStruct *reflect.Value, table *schemas.Table, colName string, idx int) (*schemas.Column, *reflect.Value, error) {
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var col = table.GetColumnIdx(colName, idx)
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if col == nil {
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return nil, nil, ErrFieldIsNotExist{colName, table.Name}
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}
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fieldValue, err := col.ValueOfV(dataStruct)
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if err != nil {
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return nil, nil, err
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}
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if fieldValue == nil {
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return nil, nil, ErrFieldIsNotValid{colName, table.Name}
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}
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if !fieldValue.IsValid() || !fieldValue.CanSet() {
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return nil, nil, ErrFieldIsNotValid{colName, table.Name}
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}
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return col, fieldValue, nil
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}
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// Cell cell is a result of one column field
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type Cell *interface{}
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func (session *Session) rows2Beans(rows *core.Rows, fields []string, types []*sql.ColumnType,
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table *schemas.Table, newElemFunc func([]string) reflect.Value,
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sliceValueSetFunc func(*reflect.Value, schemas.PK) error) error {
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for rows.Next() {
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var newValue = newElemFunc(fields)
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bean := newValue.Interface()
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dataStruct := newValue.Elem()
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// handle beforeClosures
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scanResults, err := session.row2Slice(rows, fields, types, bean)
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if err != nil {
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return err
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}
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pk, err := session.slice2Bean(scanResults, fields, bean, &dataStruct, table)
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if err != nil {
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return err
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}
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session.afterProcessors = append(session.afterProcessors, executedProcessor{
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fun: func(*Session, interface{}) error {
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return sliceValueSetFunc(&newValue, pk)
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},
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session: session,
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bean: bean,
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})
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}
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return rows.Err()
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}
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func (session *Session) row2Slice(rows *core.Rows, fields []string, types []*sql.ColumnType, bean interface{}) ([]interface{}, error) {
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for _, closure := range session.beforeClosures {
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closure(bean)
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}
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scanResults := make([]interface{}, len(fields))
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for i := 0; i < len(fields); i++ {
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var cell interface{}
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scanResults[i] = &cell
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}
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if err := session.engine.scan(rows, fields, types, scanResults...); err != nil {
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return nil, err
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}
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executeBeforeSet(bean, fields, scanResults)
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return scanResults, nil
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}
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func (session *Session) setJSON(fieldValue *reflect.Value, fieldType reflect.Type, scanResult interface{}) error {
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bs, ok := convert.AsBytes(scanResult)
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if !ok {
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return fmt.Errorf("unsupported database data type: %#v", scanResult)
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}
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if len(bs) == 0 {
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return nil
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}
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if fieldType.Kind() == reflect.String {
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fieldValue.SetString(string(bs))
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return nil
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}
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if fieldValue.CanAddr() {
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err := json.DefaultJSONHandler.Unmarshal(bs, fieldValue.Addr().Interface())
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if err != nil {
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return err
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}
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} else {
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x := reflect.New(fieldType)
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err := json.DefaultJSONHandler.Unmarshal(bs, x.Interface())
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if err != nil {
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return err
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}
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fieldValue.Set(x.Elem())
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}
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return nil
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}
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func asKind(vv reflect.Value, tp reflect.Type) (interface{}, error) {
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switch tp.Kind() {
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case reflect.Ptr:
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return asKind(vv.Elem(), tp.Elem())
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case reflect.Int64:
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return vv.Int(), nil
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case reflect.Int:
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return int(vv.Int()), nil
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case reflect.Int32:
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return int32(vv.Int()), nil
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case reflect.Int16:
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return int16(vv.Int()), nil
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case reflect.Int8:
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return int8(vv.Int()), nil
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case reflect.Uint64:
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return vv.Uint(), nil
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case reflect.Uint:
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return uint(vv.Uint()), nil
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case reflect.Uint32:
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return uint32(vv.Uint()), nil
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case reflect.Uint16:
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return uint16(vv.Uint()), nil
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case reflect.Uint8:
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return uint8(vv.Uint()), nil
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case reflect.String:
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return vv.String(), nil
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case reflect.Slice:
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if tp.Elem().Kind() == reflect.Uint8 {
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v, err := strconv.ParseInt(string(vv.Interface().([]byte)), 10, 64)
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if err != nil {
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return nil, err
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}
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return v, nil
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}
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}
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return nil, fmt.Errorf("unsupported primary key type: %v, %v", tp, vv)
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}
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func (session *Session) convertBeanField(col *schemas.Column, fieldValue *reflect.Value,
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scanResult interface{}, table *schemas.Table) error {
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v, ok := scanResult.(*interface{})
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if ok {
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scanResult = *v
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}
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if scanResult == nil {
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return nil
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}
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if fieldValue.CanAddr() {
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if structConvert, ok := fieldValue.Addr().Interface().(convert.Conversion); ok {
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data, ok := convert.AsBytes(scanResult)
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if !ok {
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return fmt.Errorf("cannot convert %#v as bytes", scanResult)
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}
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return structConvert.FromDB(data)
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}
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}
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if structConvert, ok := fieldValue.Interface().(convert.Conversion); ok {
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data, ok := convert.AsBytes(scanResult)
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if !ok {
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return fmt.Errorf("cannot convert %#v as bytes", scanResult)
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}
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if data == nil {
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return nil
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}
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if fieldValue.Kind() == reflect.Ptr && fieldValue.IsNil() {
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fieldValue.Set(reflect.New(fieldValue.Type().Elem()))
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return fieldValue.Interface().(convert.Conversion).FromDB(data)
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}
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return structConvert.FromDB(data)
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}
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vv := reflect.ValueOf(scanResult)
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fieldType := fieldValue.Type()
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if col.IsJSON {
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return session.setJSON(fieldValue, fieldType, scanResult)
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}
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switch fieldType.Kind() {
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case reflect.Ptr:
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var e reflect.Value
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if fieldValue.IsNil() {
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e = reflect.New(fieldType.Elem()).Elem()
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} else {
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e = fieldValue.Elem()
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}
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if err := session.convertBeanField(col, &e, scanResult, table); err != nil {
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return err
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}
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if fieldValue.IsNil() {
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fieldValue.Set(e.Addr())
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|
}
|
|
return nil
|
|
case reflect.Complex64, reflect.Complex128:
|
|
return session.setJSON(fieldValue, fieldType, scanResult)
|
|
case reflect.Slice, reflect.Array:
|
|
bs, ok := convert.AsBytes(scanResult)
|
|
if ok && fieldType.Elem().Kind() == reflect.Uint8 {
|
|
if col.SQLType.IsText() {
|
|
x := reflect.New(fieldType)
|
|
err := json.DefaultJSONHandler.Unmarshal(bs, x.Interface())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
fieldValue.Set(x.Elem())
|
|
} else {
|
|
if fieldValue.Len() > 0 {
|
|
for i := 0; i < fieldValue.Len(); i++ {
|
|
if i < vv.Len() {
|
|
fieldValue.Index(i).Set(vv.Index(i))
|
|
}
|
|
}
|
|
} else {
|
|
for i := 0; i < vv.Len(); i++ {
|
|
fieldValue.Set(reflect.Append(*fieldValue, vv.Index(i)))
|
|
}
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
case reflect.Struct:
|
|
if fieldType.ConvertibleTo(schemas.BigFloatType) {
|
|
v, err := convert.AsBigFloat(scanResult)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
fieldValue.Set(reflect.ValueOf(v).Elem().Convert(fieldType))
|
|
return nil
|
|
}
|
|
|
|
if fieldType.ConvertibleTo(schemas.TimeType) {
|
|
dbTZ := session.engine.DatabaseTZ
|
|
if col.TimeZone != nil {
|
|
dbTZ = col.TimeZone
|
|
}
|
|
|
|
t, err := convert.AsTime(scanResult, dbTZ, session.engine.TZLocation)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
fieldValue.Set(reflect.ValueOf(*t).Convert(fieldType))
|
|
return nil
|
|
} else if nulVal, ok := fieldValue.Addr().Interface().(sql.Scanner); ok {
|
|
err := nulVal.Scan(scanResult)
|
|
if err == nil {
|
|
return nil
|
|
}
|
|
session.engine.logger.Errorf("sql.Sanner error: %v", err)
|
|
} else if session.statement.UseCascade {
|
|
table, err := session.engine.tagParser.ParseWithCache(*fieldValue)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if len(table.PrimaryKeys) != 1 {
|
|
return errors.New("unsupported non or composited primary key cascade")
|
|
}
|
|
var pk = make(schemas.PK, len(table.PrimaryKeys))
|
|
pk[0], err = asKind(vv, reflect.TypeOf(scanResult))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if !pk.IsZero() {
|
|
// !nashtsai! TODO for hasOne relationship, it's preferred to use join query for eager fetch
|
|
// however, also need to consider adding a 'lazy' attribute to xorm tag which allow hasOne
|
|
// property to be fetched lazily
|
|
structInter := reflect.New(fieldValue.Type())
|
|
has, err := session.ID(pk).NoCascade().get(structInter.Interface())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if has {
|
|
fieldValue.Set(structInter.Elem())
|
|
} else {
|
|
return errors.New("cascade obj is not exist")
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
} // switch fieldType.Kind()
|
|
|
|
return convert.AssignValue(fieldValue.Addr(), scanResult)
|
|
}
|
|
|
|
func (session *Session) slice2Bean(scanResults []interface{}, fields []string, bean interface{}, dataStruct *reflect.Value, table *schemas.Table) (schemas.PK, error) {
|
|
defer func() {
|
|
executeAfterSet(bean, fields, scanResults)
|
|
}()
|
|
|
|
buildAfterProcessors(session, bean)
|
|
|
|
var tempMap = make(map[string]int)
|
|
var pk schemas.PK
|
|
for i, colName := range fields {
|
|
var idx int
|
|
var lKey = strings.ToLower(colName)
|
|
var ok bool
|
|
|
|
if idx, ok = tempMap[lKey]; !ok {
|
|
idx = 0
|
|
} else {
|
|
idx = idx + 1
|
|
}
|
|
tempMap[lKey] = idx
|
|
|
|
col, fieldValue, err := session.getField(dataStruct, table, colName, idx)
|
|
if err != nil {
|
|
if _, ok := err.(ErrFieldIsNotExist); ok {
|
|
continue
|
|
} else {
|
|
return nil, err
|
|
}
|
|
}
|
|
if fieldValue == nil {
|
|
continue
|
|
}
|
|
|
|
if err := session.convertBeanField(col, fieldValue, scanResults[i], table); err != nil {
|
|
return nil, err
|
|
}
|
|
if col.IsPrimaryKey {
|
|
pk = append(pk, scanResults[i])
|
|
}
|
|
}
|
|
return pk, nil
|
|
}
|
|
|
|
// saveLastSQL stores executed query information
|
|
func (session *Session) saveLastSQL(sql string, args ...interface{}) {
|
|
session.lastSQL = sql
|
|
session.lastSQLArgs = args
|
|
}
|
|
|
|
// LastSQL returns last query information
|
|
func (session *Session) LastSQL() (string, []interface{}) {
|
|
return session.lastSQL, session.lastSQLArgs
|
|
}
|
|
|
|
// Unscoped always disable struct tag "deleted"
|
|
func (session *Session) Unscoped() *Session {
|
|
session.statement.SetUnscoped()
|
|
return session
|
|
}
|
|
|
|
func (session *Session) incrVersionFieldValue(fieldValue *reflect.Value) {
|
|
switch fieldValue.Kind() {
|
|
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
|
fieldValue.SetInt(fieldValue.Int() + 1)
|
|
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
|
|
fieldValue.SetUint(fieldValue.Uint() + 1)
|
|
}
|
|
}
|
|
|
|
// Context sets the context on this session
|
|
func (session *Session) Context(ctx context.Context) *Session {
|
|
session.ctx = ctx
|
|
return session
|
|
}
|
|
|
|
// PingContext test if database is ok
|
|
func (session *Session) PingContext(ctx context.Context) error {
|
|
if session.isAutoClose {
|
|
defer session.Close()
|
|
}
|
|
|
|
session.engine.logger.Infof("PING DATABASE %v", session.engine.DriverName())
|
|
return session.DB().PingContext(ctx)
|
|
}
|