mirror of
https://github.com/astaxie/beego.git
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315 lines
7.7 KiB
Go
315 lines
7.7 KiB
Go
// Copyright 2014 beego Author. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build go1.8
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// Package orm provide ORM for MySQL/PostgreSQL/sqlite
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// Simple Usage
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//
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// package main
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//
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// import (
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// "fmt"
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// "github.com/astaxie/beego/orm"
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// _ "github.com/go-sql-driver/mysql" // import your used driver
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// )
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//
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// // Model Struct
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// type User struct {
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// Id int `orm:"auto"`
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// Name string `orm:"size(100)"`
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// }
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//
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// func init() {
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// orm.RegisterDataBase("default", "mysql", "root:root@/my_db?charset=utf8", 30)
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// }
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//
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// func main() {
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// o := orm.NewOrm()
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// user := User{Name: "slene"}
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// // insert
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// id, err := o.Insert(&user)
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// // update
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// user.Name = "astaxie"
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// num, err := o.Update(&user)
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// // read one
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// u := User{Id: user.Id}
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// err = o.Read(&u)
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// // delete
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// num, err = o.Delete(&u)
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// }
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//
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// more docs: http://beego.me/docs/mvc/model/overview.md
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package orm
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import (
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"context"
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"database/sql"
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"errors"
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"github.com/astaxie/beego/client/orm"
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"github.com/astaxie/beego/client/orm/hints"
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"github.com/astaxie/beego/core/utils"
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)
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// DebugQueries define the debug
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const (
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DebugQueries = iota
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)
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// Define common vars
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var (
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Debug = orm.Debug
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DebugLog = orm.DebugLog
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DefaultRowsLimit = orm.DefaultRowsLimit
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DefaultRelsDepth = orm.DefaultRelsDepth
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DefaultTimeLoc = orm.DefaultTimeLoc
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ErrTxHasBegan = errors.New("<Ormer.Begin> transaction already begin")
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ErrTxDone = errors.New("<Ormer.Commit/Rollback> transaction not begin")
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ErrMultiRows = errors.New("<QuerySeter> return multi rows")
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ErrNoRows = errors.New("<QuerySeter> no row found")
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ErrStmtClosed = errors.New("<QuerySeter> stmt already closed")
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ErrArgs = errors.New("<Ormer> args error may be empty")
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ErrNotImplement = errors.New("have not implement")
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)
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type ormer struct {
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delegate orm.Ormer
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txDelegate orm.TxOrmer
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isTx bool
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}
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var _ Ormer = new(ormer)
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// read data to model
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func (o *ormer) Read(md interface{}, cols ...string) error {
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if o.isTx {
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return o.txDelegate.Read(md, cols...)
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}
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return o.delegate.Read(md, cols...)
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}
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// read data to model, like Read(), but use "SELECT FOR UPDATE" form
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func (o *ormer) ReadForUpdate(md interface{}, cols ...string) error {
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if o.isTx {
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return o.txDelegate.ReadForUpdate(md, cols...)
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}
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return o.delegate.ReadForUpdate(md, cols...)
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}
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// Try to read a row from the database, or insert one if it doesn't exist
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func (o *ormer) ReadOrCreate(md interface{}, col1 string, cols ...string) (bool, int64, error) {
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if o.isTx {
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return o.txDelegate.ReadOrCreate(md, col1, cols...)
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}
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return o.delegate.ReadOrCreate(md, col1, cols...)
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}
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// insert model data to database
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func (o *ormer) Insert(md interface{}) (int64, error) {
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if o.isTx {
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return o.txDelegate.Insert(md)
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}
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return o.delegate.Insert(md)
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}
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// insert some models to database
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func (o *ormer) InsertMulti(bulk int, mds interface{}) (int64, error) {
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if o.isTx {
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return o.txDelegate.InsertMulti(bulk, mds)
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}
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return o.delegate.InsertMulti(bulk, mds)
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}
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// InsertOrUpdate data to database
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func (o *ormer) InsertOrUpdate(md interface{}, colConflitAndArgs ...string) (int64, error) {
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if o.isTx {
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return o.txDelegate.InsertOrUpdate(md, colConflitAndArgs...)
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}
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return o.delegate.InsertOrUpdate(md, colConflitAndArgs...)
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}
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// update model to database.
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// cols set the columns those want to update.
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func (o *ormer) Update(md interface{}, cols ...string) (int64, error) {
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if o.isTx {
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return o.txDelegate.Update(md, cols...)
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}
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return o.delegate.Update(md, cols...)
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}
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// delete model in database
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// cols shows the delete conditions values read from. default is pk
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func (o *ormer) Delete(md interface{}, cols ...string) (int64, error) {
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if o.isTx {
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return o.txDelegate.Delete(md, cols...)
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}
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return o.delegate.Delete(md, cols...)
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}
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// create a models to models queryer
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func (o *ormer) QueryM2M(md interface{}, name string) QueryM2Mer {
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if o.isTx {
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return o.txDelegate.QueryM2M(md, name)
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}
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return o.delegate.QueryM2M(md, name)
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}
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// load related models to md model.
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// args are limit, offset int and order string.
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//
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// example:
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// orm.LoadRelated(post,"Tags")
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// for _,tag := range post.Tags{...}
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//
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// make sure the relation is defined in model struct tags.
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func (o *ormer) LoadRelated(md interface{}, name string, args ...interface{}) (int64, error) {
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kvs := make([]utils.KV, 0, 4)
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for i, arg := range args {
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switch i {
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case 0:
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if v, ok := arg.(bool); ok {
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if v {
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kvs = append(kvs, hints.DefaultRelDepth())
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}
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} else if v, ok := arg.(int); ok {
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kvs = append(kvs, hints.RelDepth(v))
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}
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case 1:
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kvs = append(kvs, hints.Limit(orm.ToInt64(arg)))
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case 2:
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kvs = append(kvs, hints.Offset(orm.ToInt64(arg)))
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case 3:
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kvs = append(kvs, hints.Offset(orm.ToInt64(arg)))
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}
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}
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if o.isTx {
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return o.txDelegate.LoadRelated(md, name, kvs...)
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}
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return o.delegate.LoadRelated(md, name, kvs...)
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}
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// return a QuerySeter for table operations.
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// table name can be string or struct.
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// e.g. QueryTable("user"), QueryTable(&user{}) or QueryTable((*User)(nil)),
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func (o *ormer) QueryTable(ptrStructOrTableName interface{}) (qs QuerySeter) {
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if o.isTx {
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return o.txDelegate.QueryTable(ptrStructOrTableName)
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}
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return o.delegate.QueryTable(ptrStructOrTableName)
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}
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// switch to another registered database driver by given name.
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func (o *ormer) Using(name string) error {
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if o.isTx {
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return ErrTxHasBegan
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}
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o.delegate = orm.NewOrmUsingDB(name)
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return nil
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}
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// begin transaction
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func (o *ormer) Begin() error {
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if o.isTx {
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return ErrTxHasBegan
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}
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return o.BeginTx(context.Background(), nil)
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}
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func (o *ormer) BeginTx(ctx context.Context, opts *sql.TxOptions) error {
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if o.isTx {
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return ErrTxHasBegan
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}
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txOrmer, err := o.delegate.BeginWithCtxAndOpts(ctx, opts)
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if err != nil {
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return err
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}
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o.txDelegate = txOrmer
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o.isTx = true
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return nil
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}
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// commit transaction
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func (o *ormer) Commit() error {
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if !o.isTx {
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return ErrTxDone
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}
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err := o.txDelegate.Commit()
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if err == nil {
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o.isTx = false
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o.txDelegate = nil
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} else if err == sql.ErrTxDone {
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return ErrTxDone
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}
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return err
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}
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// rollback transaction
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func (o *ormer) Rollback() error {
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if !o.isTx {
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return ErrTxDone
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}
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err := o.txDelegate.Rollback()
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if err == nil {
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o.isTx = false
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o.txDelegate = nil
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} else if err == sql.ErrTxDone {
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return ErrTxDone
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}
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return err
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}
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// return a raw query seter for raw sql string.
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func (o *ormer) Raw(query string, args ...interface{}) RawSeter {
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if o.isTx {
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return o.txDelegate.Raw(query, args...)
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}
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return o.delegate.Raw(query, args...)
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}
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// return current using database Driver
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func (o *ormer) Driver() Driver {
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if o.isTx {
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return o.txDelegate.Driver()
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}
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return o.delegate.Driver()
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}
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// return sql.DBStats for current database
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func (o *ormer) DBStats() *sql.DBStats {
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if o.isTx {
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return o.txDelegate.DBStats()
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}
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return o.delegate.DBStats()
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}
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// NewOrm create new orm
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func NewOrm() Ormer {
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o := orm.NewOrm()
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return &ormer{
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delegate: o,
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}
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}
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// NewOrmWithDB create a new ormer object with specify *sql.DB for query
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func NewOrmWithDB(driverName, aliasName string, db *sql.DB) (Ormer, error) {
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o, err := orm.NewOrmWithDB(driverName, aliasName, db)
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if err != nil {
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return nil, err
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}
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return &ormer{
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delegate: o,
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}, nil
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}
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