1
1
mirror of https://github.com/go-gitea/gitea synced 2024-12-25 10:04:27 +00:00
gitea/vendor/github.com/go-xorm/xorm/session.go
2018-01-27 17:20:59 +02:00

845 lines
24 KiB
Go
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

// Copyright 2015 The Xorm Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package xorm
import (
"database/sql"
"encoding/json"
"errors"
"fmt"
"hash/crc32"
"reflect"
"strings"
"time"
"github.com/go-xorm/core"
)
// Session keep a pointer to sql.DB and provides all execution of all
// kind of database operations.
type Session struct {
db *core.DB
engine *Engine
tx *core.Tx
statement Statement
isAutoCommit bool
isCommitedOrRollbacked bool
isAutoClose bool
// Automatically reset the statement after operations that execute a SQL
// query such as Count(), Find(), Get(), ...
autoResetStatement bool
// !nashtsai! storing these beans due to yet committed tx
afterInsertBeans map[interface{}]*[]func(interface{})
afterUpdateBeans map[interface{}]*[]func(interface{})
afterDeleteBeans map[interface{}]*[]func(interface{})
// --
beforeClosures []func(interface{})
afterClosures []func(interface{})
afterProcessors []executedProcessor
prepareStmt bool
stmtCache map[uint32]*core.Stmt //key: hash.Hash32 of (queryStr, len(queryStr))
// !evalphobia! stored the last executed query on this session
//beforeSQLExec func(string, ...interface{})
lastSQL string
lastSQLArgs []interface{}
err error
}
// Clone copy all the session's content and return a new session
func (session *Session) Clone() *Session {
var sess = *session
return &sess
}
// Init reset the session as the init status.
func (session *Session) Init() {
session.statement.Init()
session.statement.Engine = session.engine
session.isAutoCommit = true
session.isCommitedOrRollbacked = false
session.isAutoClose = false
session.autoResetStatement = true
session.prepareStmt = false
// !nashtsai! is lazy init better?
session.afterInsertBeans = make(map[interface{}]*[]func(interface{}), 0)
session.afterUpdateBeans = make(map[interface{}]*[]func(interface{}), 0)
session.afterDeleteBeans = make(map[interface{}]*[]func(interface{}), 0)
session.beforeClosures = make([]func(interface{}), 0)
session.afterClosures = make([]func(interface{}), 0)
session.stmtCache = make(map[uint32]*core.Stmt)
session.afterProcessors = make([]executedProcessor, 0)
session.lastSQL = ""
session.lastSQLArgs = []interface{}{}
}
// Close release the connection from pool
func (session *Session) Close() {
for _, v := range session.stmtCache {
v.Close()
}
if session.db != nil {
// When Close be called, if session is a transaction and do not call
// Commit or Rollback, then call Rollback.
if session.tx != nil && !session.isCommitedOrRollbacked {
session.Rollback()
}
session.tx = nil
session.stmtCache = nil
session.db = nil
}
}
// IsClosed returns if session is closed
func (session *Session) IsClosed() bool {
return session.db == nil
}
func (session *Session) resetStatement() {
if session.autoResetStatement {
session.statement.Init()
}
}
// Prepare set a flag to session that should be prepare statement before execute query
func (session *Session) Prepare() *Session {
session.prepareStmt = true
return session
}
// Before Apply before Processor, affected bean is passed to closure arg
func (session *Session) Before(closures func(interface{})) *Session {
if closures != nil {
session.beforeClosures = append(session.beforeClosures, closures)
}
return session
}
// After Apply after Processor, affected bean is passed to closure arg
func (session *Session) After(closures func(interface{})) *Session {
if closures != nil {
session.afterClosures = append(session.afterClosures, closures)
}
return session
}
// Table can input a string or pointer to struct for special a table to operate.
func (session *Session) Table(tableNameOrBean interface{}) *Session {
session.statement.Table(tableNameOrBean)
return session
}
// Alias set the table alias
func (session *Session) Alias(alias string) *Session {
session.statement.Alias(alias)
return session
}
// NoCascade indicate that no cascade load child object
func (session *Session) NoCascade() *Session {
session.statement.UseCascade = false
return session
}
// ForUpdate Set Read/Write locking for UPDATE
func (session *Session) ForUpdate() *Session {
session.statement.IsForUpdate = true
return session
}
// NoAutoCondition disable generate SQL condition from beans
func (session *Session) NoAutoCondition(no ...bool) *Session {
session.statement.NoAutoCondition(no...)
return session
}
// Limit provide limit and offset query condition
func (session *Session) Limit(limit int, start ...int) *Session {
session.statement.Limit(limit, start...)
return session
}
// OrderBy provide order by query condition, the input parameter is the content
// after order by on a sql statement.
func (session *Session) OrderBy(order string) *Session {
session.statement.OrderBy(order)
return session
}
// Desc provide desc order by query condition, the input parameters are columns.
func (session *Session) Desc(colNames ...string) *Session {
session.statement.Desc(colNames...)
return session
}
// Asc provide asc order by query condition, the input parameters are columns.
func (session *Session) Asc(colNames ...string) *Session {
session.statement.Asc(colNames...)
return session
}
// StoreEngine is only avialble mysql dialect currently
func (session *Session) StoreEngine(storeEngine string) *Session {
session.statement.StoreEngine = storeEngine
return session
}
// Charset is only avialble mysql dialect currently
func (session *Session) Charset(charset string) *Session {
session.statement.Charset = charset
return session
}
// Cascade indicates if loading sub Struct
func (session *Session) Cascade(trueOrFalse ...bool) *Session {
if len(trueOrFalse) >= 1 {
session.statement.UseCascade = trueOrFalse[0]
}
return session
}
// NoCache ask this session do not retrieve data from cache system and
// get data from database directly.
func (session *Session) NoCache() *Session {
session.statement.UseCache = false
return session
}
// Join join_operator should be one of INNER, LEFT OUTER, CROSS etc - this will be prepended to JOIN
func (session *Session) Join(joinOperator string, tablename interface{}, condition string, args ...interface{}) *Session {
session.statement.Join(joinOperator, tablename, condition, args...)
return session
}
// GroupBy Generate Group By statement
func (session *Session) GroupBy(keys string) *Session {
session.statement.GroupBy(keys)
return session
}
// Having Generate Having statement
func (session *Session) Having(conditions string) *Session {
session.statement.Having(conditions)
return session
}
// DB db return the wrapper of sql.DB
func (session *Session) DB() *core.DB {
if session.db == nil {
session.db = session.engine.db
session.stmtCache = make(map[uint32]*core.Stmt, 0)
}
return session.db
}
func cleanupProcessorsClosures(slices *[]func(interface{})) {
if len(*slices) > 0 {
*slices = make([]func(interface{}), 0)
}
}
func (session *Session) canCache() bool {
if session.statement.RefTable == nil ||
session.statement.JoinStr != "" ||
session.statement.RawSQL != "" ||
!session.statement.UseCache ||
session.statement.IsForUpdate ||
session.tx != nil ||
len(session.statement.selectStr) > 0 {
return false
}
return true
}
func (session *Session) doPrepare(db *core.DB, sqlStr string) (stmt *core.Stmt, err error) {
crc := crc32.ChecksumIEEE([]byte(sqlStr))
// TODO try hash(sqlStr+len(sqlStr))
var has bool
stmt, has = session.stmtCache[crc]
if !has {
stmt, err = db.Prepare(sqlStr)
if err != nil {
return nil, err
}
session.stmtCache[crc] = stmt
}
return
}
func (session *Session) getField(dataStruct *reflect.Value, key string, table *core.Table, idx int) *reflect.Value {
var col *core.Column
if col = table.GetColumnIdx(key, idx); col == nil {
//session.engine.logger.Warnf("table %v has no column %v. %v", table.Name, key, table.ColumnsSeq())
return nil
}
fieldValue, err := col.ValueOfV(dataStruct)
if err != nil {
session.engine.logger.Error(err)
return nil
}
if !fieldValue.IsValid() || !fieldValue.CanSet() {
session.engine.logger.Warnf("table %v's column %v is not valid or cannot set", table.Name, key)
return nil
}
return fieldValue
}
// Cell cell is a result of one column field
type Cell *interface{}
func (session *Session) rows2Beans(rows *core.Rows, fields []string,
table *core.Table, newElemFunc func([]string) reflect.Value,
sliceValueSetFunc func(*reflect.Value, core.PK) error) error {
for rows.Next() {
var newValue = newElemFunc(fields)
bean := newValue.Interface()
dataStruct := newValue.Elem()
// handle beforeClosures
scanResults, err := session.row2Slice(rows, fields, bean)
if err != nil {
return err
}
pk, err := session.slice2Bean(scanResults, fields, bean, &dataStruct, table)
if err != nil {
return err
}
session.afterProcessors = append(session.afterProcessors, executedProcessor{
fun: func(*Session, interface{}) error {
return sliceValueSetFunc(&newValue, pk)
},
session: session,
bean: bean,
})
}
return nil
}
func (session *Session) row2Slice(rows *core.Rows, fields []string, bean interface{}) ([]interface{}, error) {
for _, closure := range session.beforeClosures {
closure(bean)
}
scanResults := make([]interface{}, len(fields))
for i := 0; i < len(fields); i++ {
var cell interface{}
scanResults[i] = &cell
}
if err := rows.Scan(scanResults...); err != nil {
return nil, err
}
if b, hasBeforeSet := bean.(BeforeSetProcessor); hasBeforeSet {
for ii, key := range fields {
b.BeforeSet(key, Cell(scanResults[ii].(*interface{})))
}
}
return scanResults, nil
}
func (session *Session) slice2Bean(scanResults []interface{}, fields []string, bean interface{}, dataStruct *reflect.Value, table *core.Table) (core.PK, error) {
defer func() {
if b, hasAfterSet := bean.(AfterSetProcessor); hasAfterSet {
for ii, key := range fields {
b.AfterSet(key, Cell(scanResults[ii].(*interface{})))
}
}
}()
// handle afterClosures
for _, closure := range session.afterClosures {
session.afterProcessors = append(session.afterProcessors, executedProcessor{
fun: func(sess *Session, bean interface{}) error {
closure(bean)
return nil
},
session: session,
bean: bean,
})
}
if a, has := bean.(AfterLoadProcessor); has {
session.afterProcessors = append(session.afterProcessors, executedProcessor{
fun: func(sess *Session, bean interface{}) error {
a.AfterLoad()
return nil
},
session: session,
bean: bean,
})
}
if a, has := bean.(AfterLoadSessionProcessor); has {
session.afterProcessors = append(session.afterProcessors, executedProcessor{
fun: func(sess *Session, bean interface{}) error {
a.AfterLoad(sess)
return nil
},
session: session,
bean: bean,
})
}
var tempMap = make(map[string]int)
var pk core.PK
for ii, key := range fields {
var idx int
var ok bool
var lKey = strings.ToLower(key)
if idx, ok = tempMap[lKey]; !ok {
idx = 0
} else {
idx = idx + 1
}
tempMap[lKey] = idx
if fieldValue := session.getField(dataStruct, key, table, idx); fieldValue != nil {
rawValue := reflect.Indirect(reflect.ValueOf(scanResults[ii]))
// if row is null then ignore
if rawValue.Interface() == nil {
continue
}
if fieldValue.CanAddr() {
if structConvert, ok := fieldValue.Addr().Interface().(core.Conversion); ok {
if data, err := value2Bytes(&rawValue); err == nil {
if err := structConvert.FromDB(data); err != nil {
return nil, err
}
} else {
return nil, err
}
continue
}
}
if _, ok := fieldValue.Interface().(core.Conversion); ok {
if data, err := value2Bytes(&rawValue); err == nil {
if fieldValue.Kind() == reflect.Ptr && fieldValue.IsNil() {
fieldValue.Set(reflect.New(fieldValue.Type().Elem()))
}
fieldValue.Interface().(core.Conversion).FromDB(data)
} else {
return nil, err
}
continue
}
rawValueType := reflect.TypeOf(rawValue.Interface())
vv := reflect.ValueOf(rawValue.Interface())
col := table.GetColumnIdx(key, idx)
if col.IsPrimaryKey {
pk = append(pk, rawValue.Interface())
}
fieldType := fieldValue.Type()
hasAssigned := false
if col.SQLType.IsJson() {
var bs []byte
if rawValueType.Kind() == reflect.String {
bs = []byte(vv.String())
} else if rawValueType.ConvertibleTo(core.BytesType) {
bs = vv.Bytes()
} else {
return nil, fmt.Errorf("unsupported database data type: %s %v", key, rawValueType.Kind())
}
hasAssigned = true
if len(bs) > 0 {
if fieldType.Kind() == reflect.String {
fieldValue.SetString(string(bs))
continue
}
if fieldValue.CanAddr() {
err := json.Unmarshal(bs, fieldValue.Addr().Interface())
if err != nil {
return nil, err
}
} else {
x := reflect.New(fieldType)
err := json.Unmarshal(bs, x.Interface())
if err != nil {
return nil, err
}
fieldValue.Set(x.Elem())
}
}
continue
}
switch fieldType.Kind() {
case reflect.Complex64, reflect.Complex128:
// TODO: reimplement this
var bs []byte
if rawValueType.Kind() == reflect.String {
bs = []byte(vv.String())
} else if rawValueType.ConvertibleTo(core.BytesType) {
bs = vv.Bytes()
}
hasAssigned = true
if len(bs) > 0 {
if fieldValue.CanAddr() {
err := json.Unmarshal(bs, fieldValue.Addr().Interface())
if err != nil {
return nil, err
}
} else {
x := reflect.New(fieldType)
err := json.Unmarshal(bs, x.Interface())
if err != nil {
return nil, err
}
fieldValue.Set(x.Elem())
}
}
case reflect.Slice, reflect.Array:
switch rawValueType.Kind() {
case reflect.Slice, reflect.Array:
switch rawValueType.Elem().Kind() {
case reflect.Uint8:
if fieldType.Elem().Kind() == reflect.Uint8 {
hasAssigned = true
if col.SQLType.IsText() {
x := reflect.New(fieldType)
err := json.Unmarshal(vv.Bytes(), x.Interface())
if err != nil {
return nil, 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)))
}
}
}
}
}
}
case reflect.String:
if rawValueType.Kind() == reflect.String {
hasAssigned = true
fieldValue.SetString(vv.String())
}
case reflect.Bool:
if rawValueType.Kind() == reflect.Bool {
hasAssigned = true
fieldValue.SetBool(vv.Bool())
}
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
switch rawValueType.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
hasAssigned = true
fieldValue.SetInt(vv.Int())
}
case reflect.Float32, reflect.Float64:
switch rawValueType.Kind() {
case reflect.Float32, reflect.Float64:
hasAssigned = true
fieldValue.SetFloat(vv.Float())
}
case reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint:
switch rawValueType.Kind() {
case reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint:
hasAssigned = true
fieldValue.SetUint(vv.Uint())
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
hasAssigned = true
fieldValue.SetUint(uint64(vv.Int()))
}
case reflect.Struct:
if fieldType.ConvertibleTo(core.TimeType) {
dbTZ := session.engine.DatabaseTZ
if col.TimeZone != nil {
dbTZ = col.TimeZone
}
if rawValueType == core.TimeType {
hasAssigned = true
t := vv.Convert(core.TimeType).Interface().(time.Time)
z, _ := t.Zone()
// set new location if database don't save timezone or give an incorrect timezone
if len(z) == 0 || t.Year() == 0 || t.Location().String() != dbTZ.String() { // !nashtsai! HACK tmp work around for lib/pq doesn't properly time with location
session.engine.logger.Debugf("empty zone key[%v] : %v | zone: %v | location: %+v\n", key, t, z, *t.Location())
t = time.Date(t.Year(), t.Month(), t.Day(), t.Hour(),
t.Minute(), t.Second(), t.Nanosecond(), dbTZ)
}
t = t.In(session.engine.TZLocation)
fieldValue.Set(reflect.ValueOf(t).Convert(fieldType))
} else if rawValueType == core.IntType || rawValueType == core.Int64Type ||
rawValueType == core.Int32Type {
hasAssigned = true
t := time.Unix(vv.Int(), 0).In(session.engine.TZLocation)
fieldValue.Set(reflect.ValueOf(t).Convert(fieldType))
} else {
if d, ok := vv.Interface().([]uint8); ok {
hasAssigned = true
t, err := session.byte2Time(col, d)
if err != nil {
session.engine.logger.Error("byte2Time error:", err.Error())
hasAssigned = false
} else {
fieldValue.Set(reflect.ValueOf(t).Convert(fieldType))
}
} else if d, ok := vv.Interface().(string); ok {
hasAssigned = true
t, err := session.str2Time(col, d)
if err != nil {
session.engine.logger.Error("byte2Time error:", err.Error())
hasAssigned = false
} else {
fieldValue.Set(reflect.ValueOf(t).Convert(fieldType))
}
} else {
return nil, fmt.Errorf("rawValueType is %v, value is %v", rawValueType, vv.Interface())
}
}
} else if nulVal, ok := fieldValue.Addr().Interface().(sql.Scanner); ok {
// !<winxxp>! 增加支持sql.Scanner接口的结构如sql.NullString
hasAssigned = true
if err := nulVal.Scan(vv.Interface()); err != nil {
session.engine.logger.Error("sql.Sanner error:", err.Error())
hasAssigned = false
}
} else if col.SQLType.IsJson() {
if rawValueType.Kind() == reflect.String {
hasAssigned = true
x := reflect.New(fieldType)
if len([]byte(vv.String())) > 0 {
err := json.Unmarshal([]byte(vv.String()), x.Interface())
if err != nil {
return nil, err
}
fieldValue.Set(x.Elem())
}
} else if rawValueType.Kind() == reflect.Slice {
hasAssigned = true
x := reflect.New(fieldType)
if len(vv.Bytes()) > 0 {
err := json.Unmarshal(vv.Bytes(), x.Interface())
if err != nil {
return nil, err
}
fieldValue.Set(x.Elem())
}
}
} else if session.statement.UseCascade {
table, err := session.engine.autoMapType(*fieldValue)
if err != nil {
return nil, err
}
hasAssigned = true
if len(table.PrimaryKeys) != 1 {
return nil, errors.New("unsupported non or composited primary key cascade")
}
var pk = make(core.PK, len(table.PrimaryKeys))
pk[0], err = asKind(vv, rawValueType)
if err != nil {
return nil, err
}
if !isPKZero(pk) {
// !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 nil, err
}
if has {
fieldValue.Set(structInter.Elem())
} else {
return nil, errors.New("cascade obj is not exist")
}
}
}
case reflect.Ptr:
// !nashtsai! TODO merge duplicated codes above
switch fieldType {
// following types case matching ptr's native type, therefore assign ptr directly
case core.PtrStringType:
if rawValueType.Kind() == reflect.String {
x := vv.String()
hasAssigned = true
fieldValue.Set(reflect.ValueOf(&x))
}
case core.PtrBoolType:
if rawValueType.Kind() == reflect.Bool {
x := vv.Bool()
hasAssigned = true
fieldValue.Set(reflect.ValueOf(&x))
}
case core.PtrTimeType:
if rawValueType == core.PtrTimeType {
hasAssigned = true
var x = rawValue.Interface().(time.Time)
fieldValue.Set(reflect.ValueOf(&x))
}
case core.PtrFloat64Type:
if rawValueType.Kind() == reflect.Float64 {
x := vv.Float()
hasAssigned = true
fieldValue.Set(reflect.ValueOf(&x))
}
case core.PtrUint64Type:
if rawValueType.Kind() == reflect.Int64 {
var x = uint64(vv.Int())
hasAssigned = true
fieldValue.Set(reflect.ValueOf(&x))
}
case core.PtrInt64Type:
if rawValueType.Kind() == reflect.Int64 {
x := vv.Int()
hasAssigned = true
fieldValue.Set(reflect.ValueOf(&x))
}
case core.PtrFloat32Type:
if rawValueType.Kind() == reflect.Float64 {
var x = float32(vv.Float())
hasAssigned = true
fieldValue.Set(reflect.ValueOf(&x))
}
case core.PtrIntType:
if rawValueType.Kind() == reflect.Int64 {
var x = int(vv.Int())
hasAssigned = true
fieldValue.Set(reflect.ValueOf(&x))
}
case core.PtrInt32Type:
if rawValueType.Kind() == reflect.Int64 {
var x = int32(vv.Int())
hasAssigned = true
fieldValue.Set(reflect.ValueOf(&x))
}
case core.PtrInt8Type:
if rawValueType.Kind() == reflect.Int64 {
var x = int8(vv.Int())
hasAssigned = true
fieldValue.Set(reflect.ValueOf(&x))
}
case core.PtrInt16Type:
if rawValueType.Kind() == reflect.Int64 {
var x = int16(vv.Int())
hasAssigned = true
fieldValue.Set(reflect.ValueOf(&x))
}
case core.PtrUintType:
if rawValueType.Kind() == reflect.Int64 {
var x = uint(vv.Int())
hasAssigned = true
fieldValue.Set(reflect.ValueOf(&x))
}
case core.PtrUint32Type:
if rawValueType.Kind() == reflect.Int64 {
var x = uint32(vv.Int())
hasAssigned = true
fieldValue.Set(reflect.ValueOf(&x))
}
case core.Uint8Type:
if rawValueType.Kind() == reflect.Int64 {
var x = uint8(vv.Int())
hasAssigned = true
fieldValue.Set(reflect.ValueOf(&x))
}
case core.Uint16Type:
if rawValueType.Kind() == reflect.Int64 {
var x = uint16(vv.Int())
hasAssigned = true
fieldValue.Set(reflect.ValueOf(&x))
}
case core.Complex64Type:
var x complex64
if len([]byte(vv.String())) > 0 {
err := json.Unmarshal([]byte(vv.String()), &x)
if err != nil {
return nil, err
}
fieldValue.Set(reflect.ValueOf(&x))
}
hasAssigned = true
case core.Complex128Type:
var x complex128
if len([]byte(vv.String())) > 0 {
err := json.Unmarshal([]byte(vv.String()), &x)
if err != nil {
return nil, err
}
fieldValue.Set(reflect.ValueOf(&x))
}
hasAssigned = true
} // switch fieldType
} // switch fieldType.Kind()
// !nashtsai! for value can't be assigned directly fallback to convert to []byte then back to value
if !hasAssigned {
data, err := value2Bytes(&rawValue)
if err != nil {
return nil, err
}
if err = session.bytes2Value(col, fieldValue, data); err != nil {
return nil, err
}
}
}
}
return pk, nil
}
// saveLastSQL stores executed query information
func (session *Session) saveLastSQL(sql string, args ...interface{}) {
session.lastSQL = sql
session.lastSQLArgs = args
session.engine.logSQL(sql, args...)
}
// LastSQL returns last query information
func (session *Session) LastSQL() (string, []interface{}) {
return session.lastSQL, session.lastSQLArgs
}
// tbName get some table's table name
func (session *Session) tbNameNoSchema(table *core.Table) string {
if len(session.statement.AltTableName) > 0 {
return session.statement.AltTableName
}
return table.Name
}
// Unscoped always disable struct tag "deleted"
func (session *Session) Unscoped() *Session {
session.statement.Unscoped()
return session
}