ipbl/vendor/xorm.io/xorm/session.go

746 lines
19 KiB
Go

// 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 (
"context"
"crypto/rand"
"crypto/sha256"
"database/sql"
"encoding/hex"
"errors"
"fmt"
"hash/crc32"
"io"
"reflect"
"strconv"
"strings"
"xorm.io/xorm/contexts"
"xorm.io/xorm/convert"
"xorm.io/xorm/core"
"xorm.io/xorm/internal/json"
"xorm.io/xorm/internal/statements"
"xorm.io/xorm/log"
"xorm.io/xorm/schemas"
)
// ErrFieldIsNotExist columns does not exist
type ErrFieldIsNotExist struct {
FieldName string
TableName string
}
func (e ErrFieldIsNotExist) Error() string {
return fmt.Sprintf("field %s is not exist on table %s", e.FieldName, e.TableName)
}
// ErrFieldIsNotValid is not valid
type ErrFieldIsNotValid struct {
FieldName string
TableName string
}
func (e ErrFieldIsNotValid) Error() string {
return fmt.Sprintf("field %s is not valid on table %s", e.FieldName, e.TableName)
}
type sessionType bool
const (
engineSession sessionType = false
groupSession sessionType = true
)
// Session keep a pointer to sql.DB and provides all execution of all
// kind of database operations.
type Session struct {
engine *Engine
tx *core.Tx
statement *statements.Statement
isAutoCommit bool
isCommitedOrRollbacked bool
isAutoClose bool
isClosed bool
prepareStmt 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
stmtCache map[uint32]*core.Stmt //key: hash.Hash32 of (queryStr, len(queryStr))
lastSQL string
lastSQLArgs []interface{}
ctx context.Context
sessionType sessionType
}
func newSessionID() string {
hash := sha256.New()
_, err := io.CopyN(hash, rand.Reader, 50)
if err != nil {
return "????????????????????"
}
md := hash.Sum(nil)
mdStr := hex.EncodeToString(md)
return mdStr[0:20]
}
func newSession(engine *Engine) *Session {
var ctx context.Context
if engine.logSessionID {
ctx = context.WithValue(engine.defaultContext, log.SessionIDKey, newSessionID())
} else {
ctx = engine.defaultContext
}
session := &Session{
ctx: ctx,
engine: engine,
tx: nil,
statement: statements.NewStatement(
engine.dialect,
engine.tagParser,
engine.DatabaseTZ,
),
isClosed: false,
isAutoCommit: true,
isCommitedOrRollbacked: false,
isAutoClose: false,
autoResetStatement: true,
prepareStmt: false,
afterInsertBeans: make(map[interface{}]*[]func(interface{}), 0),
afterUpdateBeans: make(map[interface{}]*[]func(interface{}), 0),
afterDeleteBeans: make(map[interface{}]*[]func(interface{}), 0),
beforeClosures: make([]func(interface{}), 0),
afterClosures: make([]func(interface{}), 0),
afterProcessors: make([]executedProcessor, 0),
stmtCache: make(map[uint32]*core.Stmt),
lastSQL: "",
lastSQLArgs: make([]interface{}, 0),
sessionType: engineSession,
}
if engine.logSessionID {
session.ctx = context.WithValue(session.ctx, log.SessionKey, session)
}
return session
}
// Close release the connection from pool
func (session *Session) Close() error {
for _, v := range session.stmtCache {
if err := v.Close(); err != nil {
return err
}
}
if !session.isClosed {
// 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 {
if err := session.Rollback(); err != nil {
return err
}
}
session.tx = nil
session.stmtCache = nil
session.isClosed = true
}
return nil
}
func (session *Session) db() *core.DB {
return session.engine.db
}
// Engine returns session Engine
func (session *Session) Engine() *Engine {
return session.engine
}
// Tx returns session tx
func (session *Session) Tx() *core.Tx {
return session.tx
}
func (session *Session) getQueryer() core.Queryer {
if session.tx != nil {
return session.tx
}
return session.db()
}
// ContextCache enable context cache or not
func (session *Session) ContextCache(context contexts.ContextCache) *Session {
session.statement.SetContextCache(context)
return session
}
// IsClosed returns if session is closed
func (session *Session) IsClosed() bool {
return session.isClosed
}
func (session *Session) resetStatement() {
if session.autoResetStatement {
session.statement.Reset()
}
}
// 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 {
if err := session.statement.SetTable(tableNameOrBean); err != nil {
session.statement.LastError = err
}
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.SetNoAutoCondition(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
}
// MustLogSQL means record SQL or not and don't follow engine's setting
func (session *Session) MustLogSQL(logs ...bool) *Session {
var showSQL = true
if len(logs) > 0 {
showSQL = logs[0]
}
session.ctx = context.WithValue(session.ctx, log.SessionShowSQLKey, showSQL)
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 {
return session.db()
}
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.PrepareContext(session.ctx, sqlStr)
if err != nil {
return nil, err
}
session.stmtCache[crc] = stmt
}
return
}
func (session *Session) getField(dataStruct *reflect.Value, table *schemas.Table, colName string, idx int) (*schemas.Column, *reflect.Value, error) {
var col = table.GetColumnIdx(colName, idx)
if col == nil {
return nil, nil, ErrFieldIsNotExist{colName, table.Name}
}
fieldValue, err := col.ValueOfV(dataStruct)
if err != nil {
return nil, nil, err
}
if fieldValue == nil {
return nil, nil, ErrFieldIsNotValid{colName, table.Name}
}
if !fieldValue.IsValid() || !fieldValue.CanSet() {
return nil, nil, ErrFieldIsNotValid{colName, table.Name}
}
return col, fieldValue, nil
}
// Cell cell is a result of one column field
type Cell *interface{}
func (session *Session) rows2Beans(rows *core.Rows, fields []string, types []*sql.ColumnType,
table *schemas.Table, newElemFunc func([]string) reflect.Value,
sliceValueSetFunc func(*reflect.Value, schemas.PK) error) error {
for rows.Next() {
var newValue = newElemFunc(fields)
bean := newValue.Interface()
dataStruct := newValue.Elem()
// handle beforeClosures
scanResults, err := session.row2Slice(rows, fields, types, 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 rows.Err()
}
func (session *Session) row2Slice(rows *core.Rows, fields []string, types []*sql.ColumnType, 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 := session.engine.scan(rows, fields, types, scanResults...); err != nil {
return nil, err
}
executeBeforeSet(bean, fields, scanResults)
return scanResults, nil
}
func (session *Session) setJSON(fieldValue *reflect.Value, fieldType reflect.Type, scanResult interface{}) error {
bs, ok := convert.AsBytes(scanResult)
if !ok {
return fmt.Errorf("unsupported database data type: %#v", scanResult)
}
if len(bs) == 0 {
return nil
}
if fieldType.Kind() == reflect.String {
fieldValue.SetString(string(bs))
return nil
}
if fieldValue.CanAddr() {
err := json.DefaultJSONHandler.Unmarshal(bs, fieldValue.Addr().Interface())
if err != nil {
return err
}
} else {
x := reflect.New(fieldType)
err := json.DefaultJSONHandler.Unmarshal(bs, x.Interface())
if err != nil {
return err
}
fieldValue.Set(x.Elem())
}
return nil
}
func asKind(vv reflect.Value, tp reflect.Type) (interface{}, error) {
switch tp.Kind() {
case reflect.Ptr:
return asKind(vv.Elem(), tp.Elem())
case reflect.Int64:
return vv.Int(), nil
case reflect.Int:
return int(vv.Int()), nil
case reflect.Int32:
return int32(vv.Int()), nil
case reflect.Int16:
return int16(vv.Int()), nil
case reflect.Int8:
return int8(vv.Int()), nil
case reflect.Uint64:
return vv.Uint(), nil
case reflect.Uint:
return uint(vv.Uint()), nil
case reflect.Uint32:
return uint32(vv.Uint()), nil
case reflect.Uint16:
return uint16(vv.Uint()), nil
case reflect.Uint8:
return uint8(vv.Uint()), nil
case reflect.String:
return vv.String(), nil
case reflect.Slice:
if tp.Elem().Kind() == reflect.Uint8 {
v, err := strconv.ParseInt(string(vv.Interface().([]byte)), 10, 64)
if err != nil {
return nil, err
}
return v, nil
}
}
return nil, fmt.Errorf("unsupported primary key type: %v, %v", tp, vv)
}
func (session *Session) convertBeanField(col *schemas.Column, fieldValue *reflect.Value,
scanResult interface{}, table *schemas.Table) error {
v, ok := scanResult.(*interface{})
if ok {
scanResult = *v
}
if scanResult == nil {
return nil
}
if fieldValue.CanAddr() {
if structConvert, ok := fieldValue.Addr().Interface().(convert.Conversion); ok {
data, ok := convert.AsBytes(scanResult)
if !ok {
return fmt.Errorf("cannot convert %#v as bytes", scanResult)
}
return structConvert.FromDB(data)
}
}
if structConvert, ok := fieldValue.Interface().(convert.Conversion); ok {
data, ok := convert.AsBytes(scanResult)
if !ok {
return fmt.Errorf("cannot convert %#v as bytes", scanResult)
}
if data == nil {
return nil
}
if fieldValue.Kind() == reflect.Ptr && fieldValue.IsNil() {
fieldValue.Set(reflect.New(fieldValue.Type().Elem()))
return fieldValue.Interface().(convert.Conversion).FromDB(data)
}
return structConvert.FromDB(data)
}
vv := reflect.ValueOf(scanResult)
fieldType := fieldValue.Type()
if col.IsJSON {
return session.setJSON(fieldValue, fieldType, scanResult)
}
switch fieldType.Kind() {
case reflect.Ptr:
var e reflect.Value
if fieldValue.IsNil() {
e = reflect.New(fieldType.Elem()).Elem()
} else {
e = fieldValue.Elem()
}
if err := session.convertBeanField(col, &e, scanResult, table); err != nil {
return err
}
if fieldValue.IsNil() {
fieldValue.Set(e.Addr())
}
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)
}