mirror of
https://gitee.com/johng/gf.git
synced 2024-11-30 11:18:02 +08:00
369 lines
12 KiB
Go
369 lines
12 KiB
Go
// Copyright 2017 gf Author(https://github.com/gogf/gf). All Rights Reserved.
|
||
//
|
||
// This Source Code Form is subject to the terms of the MIT License.
|
||
// If a copy of the MIT was not distributed with this file,
|
||
// You can obtain one at https://github.com/gogf/gf.
|
||
|
||
// Package gdb provides ORM features for popular relationship databases.
|
||
package gdb
|
||
|
||
import (
|
||
"database/sql"
|
||
"errors"
|
||
"fmt"
|
||
"time"
|
||
|
||
"github.com/gogf/gf/container/gmap"
|
||
"github.com/gogf/gf/container/gring"
|
||
"github.com/gogf/gf/container/gtype"
|
||
"github.com/gogf/gf/container/gvar"
|
||
"github.com/gogf/gf/os/gcache"
|
||
"github.com/gogf/gf/util/grand"
|
||
)
|
||
|
||
// 数据库操作接口
|
||
type DB interface {
|
||
// 建立数据库连接方法(开发者一般不需要直接调用)
|
||
Open(config *ConfigNode) (*sql.DB, error)
|
||
|
||
// SQL操作方法 API
|
||
Query(query string, args ...interface{}) (*sql.Rows, error)
|
||
Exec(sql string, args ...interface{}) (sql.Result, error)
|
||
Prepare(sql string, execOnMaster ...bool) (*sql.Stmt, error)
|
||
|
||
// 内部实现API的方法(不同数据库可覆盖这些方法实现自定义的操作)
|
||
doQuery(link dbLink, query string, args ...interface{}) (rows *sql.Rows, err error)
|
||
doGetAll(link dbLink, query string, args ...interface{}) (result Result, err error)
|
||
doExec(link dbLink, query string, args ...interface{}) (result sql.Result, err error)
|
||
doPrepare(link dbLink, query string) (*sql.Stmt, error)
|
||
doInsert(link dbLink, table string, data interface{}, option int, batch ...int) (result sql.Result, err error)
|
||
doBatchInsert(link dbLink, table string, list interface{}, option int, batch ...int) (result sql.Result, err error)
|
||
doUpdate(link dbLink, table string, data interface{}, condition string, args ...interface{}) (result sql.Result, err error)
|
||
doDelete(link dbLink, table string, condition string, args ...interface{}) (result sql.Result, err error)
|
||
|
||
// 数据库查询
|
||
GetAll(query string, args ...interface{}) (Result, error)
|
||
GetOne(query string, args ...interface{}) (Record, error)
|
||
GetValue(query string, args ...interface{}) (Value, error)
|
||
GetCount(query string, args ...interface{}) (int, error)
|
||
GetStruct(objPointer interface{}, query string, args ...interface{}) error
|
||
GetStructs(objPointerSlice interface{}, query string, args ...interface{}) error
|
||
GetScan(objPointer interface{}, query string, args ...interface{}) error
|
||
|
||
// 创建底层数据库master/slave链接对象
|
||
Master() (*sql.DB, error)
|
||
Slave() (*sql.DB, error)
|
||
|
||
// Ping
|
||
PingMaster() error
|
||
PingSlave() error
|
||
|
||
// 开启事务操作
|
||
Begin() (*TX, error)
|
||
|
||
// 数据表插入/更新/保存操作
|
||
Insert(table string, data interface{}, batch ...int) (sql.Result, error)
|
||
Replace(table string, data interface{}, batch ...int) (sql.Result, error)
|
||
Save(table string, data interface{}, batch ...int) (sql.Result, error)
|
||
|
||
// 数据表插入/更新/保存操作(批量)
|
||
BatchInsert(table string, list interface{}, batch ...int) (sql.Result, error)
|
||
BatchReplace(table string, list interface{}, batch ...int) (sql.Result, error)
|
||
BatchSave(table string, list interface{}, batch ...int) (sql.Result, error)
|
||
|
||
// 数据修改/删除
|
||
Update(table string, data interface{}, condition interface{}, args ...interface{}) (sql.Result, error)
|
||
Delete(table string, condition interface{}, args ...interface{}) (sql.Result, error)
|
||
|
||
// 创建链式操作对象
|
||
From(tables string) *Model
|
||
Table(tables string) *Model
|
||
|
||
// 设置管理
|
||
SetDebug(debug bool)
|
||
SetSchema(schema string)
|
||
GetQueriedSqls() []*Sql
|
||
GetLastSql() *Sql
|
||
PrintQueriedSqls()
|
||
SetMaxIdleConnCount(n int)
|
||
SetMaxOpenConnCount(n int)
|
||
SetMaxConnLifetime(n int)
|
||
|
||
// 内部方法接口
|
||
getCache() *gcache.Cache
|
||
getChars() (charLeft string, charRight string)
|
||
getDebug() bool
|
||
quoteWord(s string) string
|
||
setSchema(sqlDb *sql.DB, schema string) error
|
||
filterFields(table string, data map[string]interface{}) map[string]interface{}
|
||
formatWhere(where interface{}, args []interface{}) (newWhere string, newArgs []interface{})
|
||
convertValue(fieldValue []byte, fieldType string) interface{}
|
||
getTableFields(table string) (map[string]string, error)
|
||
rowsToResult(rows *sql.Rows) (Result, error)
|
||
handleSqlBeforeExec(sql string) string
|
||
}
|
||
|
||
// 执行底层数据库操作的核心接口
|
||
type dbLink interface {
|
||
Query(query string, args ...interface{}) (*sql.Rows, error)
|
||
Exec(sql string, args ...interface{}) (sql.Result, error)
|
||
Prepare(sql string) (*sql.Stmt, error)
|
||
}
|
||
|
||
// 数据库链接对象
|
||
type dbBase struct {
|
||
db DB // 数据库对象
|
||
group string // 配置分组名称
|
||
debug *gtype.Bool // (默认关闭)是否开启调试模式，当开启时会启用一些调试特性
|
||
sqls *gring.Ring // (debug=true时有效)已执行的SQL列表
|
||
cache *gcache.Cache // 数据库缓存，包括底层连接池对象缓存及查询缓存；需要注意的是，事务查询不支持查询缓存
|
||
schema *gtype.String // 手动切换的数据库名称
|
||
tables map[string]map[string]string // 数据库表结构
|
||
maxIdleConnCount *gtype.Int // 连接池最大限制的连接数
|
||
maxOpenConnCount *gtype.Int // 连接池最大打开的连接数
|
||
maxConnLifetime *gtype.Int // (单位秒)连接对象可重复使用的时间长度
|
||
}
|
||
|
||
// 执行的SQL对象
|
||
type Sql struct {
|
||
Sql string // SQL语句(可能带有预处理占位符)
|
||
Args []interface{} // 预处理参数值列表
|
||
Error error // 执行结果(nil为成功)
|
||
Start int64 // 执行开始时间(毫秒)
|
||
End int64 // 执行结束时间(毫秒)
|
||
Func string // 执行方法
|
||
}
|
||
|
||
// 返回数据表记录值
|
||
type Value = *gvar.Var
|
||
|
||
// 返回数据表记录Map
|
||
type Record map[string]Value
|
||
|
||
// 返回数据表记录List
|
||
type Result []Record
|
||
|
||
// 关联数组，绑定一条数据表记录(使用别名)
|
||
type Map = map[string]interface{}
|
||
|
||
// 关联数组列表(索引从0开始的数组)，绑定多条记录(使用别名)
|
||
type List = []Map
|
||
|
||
const (
|
||
OPTION_INSERT = 0
|
||
OPTION_REPLACE = 1
|
||
OPTION_SAVE = 2
|
||
OPTION_IGNORE = 3
|
||
gDEFAULT_BATCH_NUM = 10 // Per count for batch insert/replace/save
|
||
gDEFAULT_CONN_MAX_LIFE_TIME = 30 // Max life time for per connection in pool.
|
||
)
|
||
|
||
var (
|
||
// Instance map.
|
||
instances = gmap.NewStrAnyMap(true)
|
||
)
|
||
|
||
// New creates ORM DB object with global configurations.
|
||
// The parameter <name> specifies the configuration group name,
|
||
// which is DEFAULT_GROUP_NAME in default.
|
||
func New(name ...string) (db DB, err error) {
|
||
group := configs.defaultGroup
|
||
if len(name) > 0 && name[0] != "" {
|
||
group = name[0]
|
||
}
|
||
configs.RLock()
|
||
defer configs.RUnlock()
|
||
|
||
if len(configs.config) < 1 {
|
||
return nil, errors.New("empty database configuration")
|
||
}
|
||
if _, ok := configs.config[group]; ok {
|
||
if node, err := getConfigNodeByGroup(group, true); err == nil {
|
||
base := &dbBase{
|
||
group: group,
|
||
debug: gtype.NewBool(),
|
||
cache: gcache.New(),
|
||
schema: gtype.NewString(),
|
||
maxIdleConnCount: gtype.NewInt(),
|
||
maxOpenConnCount: gtype.NewInt(),
|
||
maxConnLifetime: gtype.NewInt(gDEFAULT_CONN_MAX_LIFE_TIME),
|
||
}
|
||
switch node.Type {
|
||
case "mysql":
|
||
base.db = &dbMysql{dbBase: base}
|
||
case "pgsql":
|
||
base.db = &dbPgsql{dbBase: base}
|
||
case "mssql":
|
||
base.db = &dbMssql{dbBase: base}
|
||
case "sqlite":
|
||
base.db = &dbSqlite{dbBase: base}
|
||
case "oracle":
|
||
base.db = &dbOracle{dbBase: base}
|
||
default:
|
||
return nil, errors.New(fmt.Sprintf(`unsupported database type "%s"`, node.Type))
|
||
}
|
||
return base.db, nil
|
||
} else {
|
||
return nil, err
|
||
}
|
||
} else {
|
||
return nil, errors.New(fmt.Sprintf("empty database configuration for item name '%s'", group))
|
||
}
|
||
}
|
||
|
||
// Instance returns an instance for DB operations.
|
||
// The parameter <name> specifies the configuration group name,
|
||
// which is DEFAULT_GROUP_NAME in default.
|
||
func Instance(name ...string) (db DB, err error) {
|
||
group := configs.defaultGroup
|
||
if len(name) > 0 {
|
||
group = name[0]
|
||
}
|
||
v := instances.GetOrSetFuncLock(group, func() interface{} {
|
||
db, err = New(group)
|
||
return db
|
||
})
|
||
if v != nil {
|
||
return v.(DB), nil
|
||
}
|
||
return
|
||
}
|
||
|
||
// 获取指定数据库角色的一个配置项，内部根据权重计算负载均衡
|
||
func getConfigNodeByGroup(group string, master bool) (*ConfigNode, error) {
|
||
if list, ok := configs.config[group]; ok {
|
||
// 将master, slave集群列表拆分出来
|
||
masterList := make(ConfigGroup, 0)
|
||
slaveList := make(ConfigGroup, 0)
|
||
for i := 0; i < len(list); i++ {
|
||
if list[i].Role == "slave" {
|
||
slaveList = append(slaveList, list[i])
|
||
} else {
|
||
masterList = append(masterList, list[i])
|
||
}
|
||
}
|
||
if len(masterList) < 1 {
|
||
return nil, errors.New("at least one master node configuration's need to make sense")
|
||
}
|
||
if len(slaveList) < 1 {
|
||
slaveList = masterList
|
||
}
|
||
if master {
|
||
return getConfigNodeByWeight(masterList), nil
|
||
} else {
|
||
return getConfigNodeByWeight(slaveList), nil
|
||
}
|
||
} else {
|
||
return nil, errors.New(fmt.Sprintf("empty database configuration for item name '%s'", group))
|
||
}
|
||
}
|
||
|
||
// 按照负载均衡算法(优先级配置)从数据库集群中选择一个配置节点出来使用
|
||
// 算法说明举例，
|
||
// 1、假如2个节点的priority都是1，那么随机大小范围为[0, 199]；
|
||
// 2、那么节点1的权重范围为[0, 99]，节点2的权重范围为[100, 199]，比例为1:1；
|
||
// 3、假如计算出的随机数为99;
|
||
// 4、那么选择的配置为节点1;
|
||
func getConfigNodeByWeight(cg ConfigGroup) *ConfigNode {
|
||
if len(cg) < 2 {
|
||
return &cg[0]
|
||
}
|
||
var total int
|
||
for i := 0; i < len(cg); i++ {
|
||
total += cg[i].Weight * 100
|
||
}
|
||
// 如果total为0表示所有连接都没有配置priority属性，那么默认都是1
|
||
if total == 0 {
|
||
for i := 0; i < len(cg); i++ {
|
||
cg[i].Weight = 1
|
||
total += cg[i].Weight * 100
|
||
}
|
||
}
|
||
// 不能取到末尾的边界点
|
||
r := grand.Rand(0, total)
|
||
if r > 0 {
|
||
r -= 1
|
||
}
|
||
min := 0
|
||
max := 0
|
||
for i := 0; i < len(cg); i++ {
|
||
max = min + cg[i].Weight*100
|
||
//fmt.Printf("r: %d, min: %d, max: %d\n", r, min, max)
|
||
if r >= min && r < max {
|
||
return &cg[i]
|
||
} else {
|
||
min = max
|
||
}
|
||
}
|
||
return nil
|
||
}
|
||
|
||
// 获得底层数据库链接对象
|
||
func (bs *dbBase) getSqlDb(master bool) (sqlDb *sql.DB, err error) {
|
||
// 负载均衡
|
||
node, err := getConfigNodeByGroup(bs.group, master)
|
||
if err != nil {
|
||
return nil, err
|
||
}
|
||
// 默认值设定
|
||
if node.Charset == "" {
|
||
node.Charset = "utf8"
|
||
}
|
||
// 缓存连接对象(该对象其实是一个连接池对象)
|
||
v := bs.cache.GetOrSetFuncLock(node.String(), func() interface{} {
|
||
sqlDb, err = bs.db.Open(node)
|
||
if err != nil {
|
||
return nil
|
||
}
|
||
// 接口对象可能会覆盖这些连接参数，所以这里优先判断有误设置连接池属性。
|
||
// 若无设置则使用配置节点的连接池参数
|
||
if n := bs.maxIdleConnCount.Val(); n > 0 {
|
||
sqlDb.SetMaxIdleConns(n)
|
||
} else if node.MaxIdleConnCount > 0 {
|
||
sqlDb.SetMaxIdleConns(node.MaxIdleConnCount)
|
||
}
|
||
|
||
if n := bs.maxOpenConnCount.Val(); n > 0 {
|
||
sqlDb.SetMaxOpenConns(n)
|
||
} else if node.MaxOpenConnCount > 0 {
|
||
sqlDb.SetMaxOpenConns(node.MaxOpenConnCount)
|
||
}
|
||
|
||
if n := bs.maxConnLifetime.Val(); n > 0 {
|
||
sqlDb.SetConnMaxLifetime(time.Duration(n) * time.Second)
|
||
} else if node.MaxConnLifetime > 0 {
|
||
sqlDb.SetConnMaxLifetime(time.Duration(node.MaxConnLifetime) * time.Second)
|
||
}
|
||
return sqlDb
|
||
}, 0)
|
||
if v != nil && sqlDb == nil {
|
||
sqlDb = v.(*sql.DB)
|
||
}
|
||
// 是否开启调试模式
|
||
if node.Debug {
|
||
bs.db.SetDebug(node.Debug)
|
||
}
|
||
// 是否手动选择数据库
|
||
if v := bs.schema.Val(); v != "" {
|
||
if e := bs.db.setSchema(sqlDb, v); e != nil {
|
||
err = e
|
||
}
|
||
}
|
||
return
|
||
}
|
||
|
||
// 切换当前数据库对象操作的数据库。
|
||
func (bs *dbBase) SetSchema(schema string) {
|
||
bs.schema.Set(schema)
|
||
}
|
||
|
||
// 创建底层数据库master链接对象。
|
||
func (bs *dbBase) Master() (*sql.DB, error) {
|
||
return bs.getSqlDb(true)
|
||
}
|
||
|
||
// 创建底层数据库slave链接对象。
|
||
func (bs *dbBase) Slave() (*sql.DB, error) {
|
||
return bs.getSqlDb(false)
|
||
}
|