mirror of
https://gitee.com/johng/gf.git
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326 lines
9.0 KiB
Go
326 lines
9.0 KiB
Go
// Copyright 2017 gf Author(https://gitee.com/johng/gf). All Rights Reserved.
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//
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// This Source Code Form is subject to the terms of the MIT License.
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// If a copy of the MIT was not distributed with this file,
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// You can obtain one at https://gitee.com/johng/gf.
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package gdb
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import (
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"fmt"
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"errors"
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"database/sql"
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"gitee.com/johng/gf/g/util/gconv"
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_ "github.com/go-sql-driver/mysql"
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)
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// 数据库链式操作模型对象
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type Model struct {
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tx *Tx // 数据库事务对象
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db *Db // 数据库操作对象
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tables string // 数据库操作表
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fields string // 操作字段
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where string // 操作条件
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whereArgs []interface{} // 操作条件参数
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groupBy string // 分组语句
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orderBy string // 排序语句
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start int // 分页开始
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limit int // 分页条数
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data interface{} // 操作记录(支持Map/List/string类型)
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batch int // 批量操作条数
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}
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// 链式操作，数据表字段，可支持多个表，以半角逗号连接
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func (db *Db) Table(tables string) (*Model) {
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return &Model {
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db : db,
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tables : tables,
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fields : "*",
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}
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}
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// 链式操作，数据表字段，可支持多个表，以半角逗号连接
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func (db *Db) From(tables string) (*Model) {
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return db.Table(tables)
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}
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// (事务)链式操作，数据表字段，可支持多个表，以半角逗号连接
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func (tx *Tx) Table(tables string) (*Model) {
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return &Model {
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tx : tx,
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tables : tables,
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}
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}
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// (事务)链式操作，数据表字段，可支持多个表，以半角逗号连接
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func (tx *Tx) From(tables string) (*Model) {
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return tx.Table(tables)
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}
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// 链式操作，左联表
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func (md *Model) LeftJoin(joinTable string, on string) (*Model) {
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md.tables += fmt.Sprintf(" LEFT JOIN %s ON (%s)", joinTable, on)
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return md
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}
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// 链式操作，右联表
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func (md *Model) RightJoin(joinTable string, on string) (*Model) {
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md.tables += fmt.Sprintf(" RIGHT JOIN %s ON (%s)", joinTable, on)
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return md
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}
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// 链式操作，内联表
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func (md *Model) InnerJoin(joinTable string, on string) (*Model) {
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md.tables += fmt.Sprintf(" INNER JOIN %s ON (%s)", joinTable, on)
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return md
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}
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// 链式操作，查询字段
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func (md *Model) Fields(fields string) (*Model) {
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md.fields = fields
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return md
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}
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// 链式操作，condition，支持string & gdb.Map
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func (md *Model) Where(where interface{}, args...interface{}) (*Model) {
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md.where = md.db.formatCondition(where)
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md.whereArgs = args
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return md
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}
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// 链式操作，添加AND条件到Where中
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func (md *Model) And(where interface{}, args...interface{}) (*Model) {
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md.where += " AND " + md.db.formatCondition(where)
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md.whereArgs = append(md.whereArgs, args)
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return md
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}
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// 链式操作，添加OR条件到Where中
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func (md *Model) Or(where interface{}, args...interface{}) (*Model) {
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md.where += " OR " + md.db.formatCondition(where)
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md.whereArgs = append(md.whereArgs, args)
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return md
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}
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// 链式操作，group by
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func (md *Model) GroupBy(groupBy string) (*Model) {
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md.groupBy = groupBy
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return md
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}
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// 链式操作，order by
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func (md *Model) OrderBy(orderBy string) (*Model) {
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md.orderBy = orderBy
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return md
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}
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// 链式操作，limit
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func (md *Model) Limit(start int, limit int) (*Model) {
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md.start = start
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md.limit = limit
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return md
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}
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// 链式操作，操作数据记录项，可以是string/Map, 也可以是：key,value,key,value,...
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func (md *Model) Data(data...interface{}) (*Model) {
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if len(data) > 1 {
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m := make(map[string]interface{})
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for i := 0; i < len(data); i += 2 {
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m[gconv.String(data[i])] = data[i + 1]
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}
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md.data = m
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} else {
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md.data = data[0]
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}
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return md
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}
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// 链式操作， CURD - Insert/BatchInsert
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func (md *Model) Insert() (sql.Result, error) {
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// 批量操作
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if list, ok := md.data.(List); ok {
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batch := 10
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if md.batch > 0 {
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batch = md.batch
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}
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if md.tx == nil {
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return md.db.BatchInsert(md.tables, list, batch)
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} else {
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return md.tx.BatchInsert(md.tables, list, batch)
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}
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}
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// 记录操作
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if md.data == nil {
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return nil, errors.New("inserting into table with empty data")
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}
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if dataMap, ok := md.data.(Map); ok {
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if md.tx == nil {
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return md.db.Insert(md.tables, dataMap)
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} else {
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return md.tx.Insert(md.tables, dataMap)
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}
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}
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return nil, errors.New("inserting into table with invalid data type")
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}
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// 链式操作， CURD - Replace/BatchReplace
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func (md *Model) Replace() (sql.Result, error) {
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// 批量操作
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if list, ok := md.data.(List); ok {
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batch := 10
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if md.batch > 0 {
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batch = md.batch
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}
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if md.tx == nil {
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return md.db.BatchReplace(md.tables, list, batch)
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} else {
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return md.tx.BatchReplace(md.tables, list, batch)
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}
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}
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// 记录操作
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if md.data == nil {
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return nil, errors.New("replacing into table with empty data")
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}
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if dataMap, ok := md.data.(Map); ok {
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if md.tx == nil {
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return md.db.Insert(md.tables, dataMap)
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} else {
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return md.tx.Insert(md.tables, dataMap)
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}
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}
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return nil, errors.New("replacing into table with invalid data type")
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}
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// 链式操作， CURD - Save/BatchSave
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func (md *Model) Save() (sql.Result, error) {
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// 批量操作
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if list, ok := md.data.(List); ok {
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batch := 10
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if md.batch > 0 {
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batch = md.batch
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}
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if md.tx == nil {
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return md.db.BatchSave(md.tables, list, batch)
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} else {
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return md.tx.BatchSave(md.tables, list, batch)
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}
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}
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// 记录操作
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if md.data == nil {
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return nil, errors.New("saving into table with empty data")
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}
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if dataMap, ok := md.data.(Map); ok {
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if md.tx == nil {
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return md.db.Save(md.tables, dataMap)
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} else {
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return md.tx.Save(md.tables, dataMap)
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}
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}
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return nil, errors.New("saving into table with invalid data type")
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}
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// 链式操作， CURD - Update
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func (md *Model) Update() (sql.Result, error) {
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if md.data == nil {
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return nil, errors.New("updating table with empty data")
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}
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if md.tx == nil {
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return md.db.Update(md.tables, md.data, md.where, md.whereArgs ...)
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} else {
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return md.tx.Update(md.tables, md.data, md.where, md.whereArgs ...)
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}
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}
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// 链式操作， CURD - Delete
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func (md *Model) Delete() (sql.Result, error) {
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if md.where == "" {
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return nil, errors.New("where is required while deleting")
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}
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if md.tx == nil {
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return md.db.Delete(md.tables, md.where, md.whereArgs...)
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} else {
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return md.tx.Delete(md.tables, md.where, md.whereArgs...)
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}
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}
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// 设置批处理的大小
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func (md *Model) Batch(batch int) *Model {
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md.batch = batch
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return md
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}
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// 链式操作，select
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func (md *Model) Select() (List, error) {
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if md.tx == nil {
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return md.db.GetAll(md.getFormattedSql(), md.whereArgs...)
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} else {
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return md.tx.GetAll(md.getFormattedSql(), md.whereArgs...)
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}
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}
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// 链式操作，查询所有记录
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func (md *Model) All() (List, error) {
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return md.Select()
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}
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// 链式操作，查询单条记录
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func (md *Model) One() (Map, error) {
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list, err := md.All()
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if err != nil {
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return nil, err
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}
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if len(list) > 0 {
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return list[0], nil
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}
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return nil, nil
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}
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// 链式操作，查询字段值
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func (md *Model) Value() (interface{}, error) {
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one, err := md.One()
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if err != nil {
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return "", err
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}
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for _, v := range one {
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return v, nil
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}
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return "", nil
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}
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// 链式操作，查询数量，fields可以为空，也可以自定义查询字段，
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// 当给定自定义查询字段时，该字段必须为数量结果，否则会引起歧义，如：Fields("COUNT(id)")
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func (md *Model) Count() (int, error) {
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if md.fields == "" || md.fields == "*" {
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md.fields = "COUNT(1)"
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}
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s := md.getFormattedSql()
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if len(md.groupBy) > 0 {
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s = fmt.Sprintf("SELECT COUNT(1) FROM (%s) count_alias", s)
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}
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if md.tx == nil {
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return md.db.GetCount(s, md.whereArgs...)
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} else {
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return md.tx.GetCount(s, md.whereArgs...)
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}
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}
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// 格式化当前输入参数，返回可执行的SQL语句（不带参数）
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func (md *Model) getFormattedSql() string {
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if md.fields == "" {
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md.fields = "*"
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}
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s := fmt.Sprintf("SELECT %s FROM %s", md.fields, md.tables)
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if md.where != "" {
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s += " WHERE " + md.where
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}
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if md.groupBy != "" {
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s += " GROUP BY " + md.groupBy
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}
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if md.orderBy != "" {
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s += " ORDER BY " + md.orderBy
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}
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if md.limit != 0 {
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s += fmt.Sprintf(" LIMIT %d, %d", md.start, md.limit)
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}
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return s
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} |