mirror of
https://gitee.com/johng/gf.git
synced 2024-12-04 21:28:22 +08:00
238 lines
6.6 KiB
Go
238 lines
6.6 KiB
Go
// Copyright 2017 gf Author(https://gitee.com/johng/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://gitee.com/johng/gf.
|
||
|
||
// 关系数据库操作
|
||
package gdb
|
||
|
||
import (
|
||
"fmt"
|
||
"errors"
|
||
"database/sql"
|
||
"gitee.com/johng/gf/g/os/glog"
|
||
"gitee.com/johng/gf/g/os/gcache"
|
||
"gitee.com/johng/gf/g/util/grand"
|
||
_ "github.com/lib/pq"
|
||
_ "github.com/go-sql-driver/mysql"
|
||
)
|
||
|
||
const (
|
||
OPTION_INSERT = 0
|
||
OPTION_REPLACE = 1
|
||
OPTION_SAVE = 2
|
||
OPTION_IGNORE = 3
|
||
)
|
||
|
||
// 数据库操作接口
|
||
type Link interface {
|
||
Open (c *ConfigNode) (*sql.DB, error)
|
||
Close() error
|
||
Query(q string, args ...interface{}) (*sql.Rows, error)
|
||
Exec(q string, args ...interface{}) (sql.Result, error)
|
||
Prepare(q string) (*sql.Stmt, error)
|
||
|
||
GetAll(q string, args ...interface{}) (List, error)
|
||
GetOne(q string, args ...interface{}) (Map, error)
|
||
GetValue(q string, args ...interface{}) (interface{}, error)
|
||
|
||
PingMaster() error
|
||
PingSlave() error
|
||
|
||
SetMaxIdleConns(n int)
|
||
SetMaxOpenConns(n int)
|
||
|
||
setMaster(master *sql.DB)
|
||
setSlave(slave *sql.DB)
|
||
setQuoteChar(left string, right string)
|
||
setLink(link Link)
|
||
getQuoteCharLeft () string
|
||
getQuoteCharRight () string
|
||
handleSqlBeforeExec(q *string) *string
|
||
|
||
Begin() (*sql.Tx, error)
|
||
Commit() error
|
||
Rollback() error
|
||
|
||
insert(table string, data Map, option uint8) (sql.Result, error)
|
||
Insert(table string, data Map) (sql.Result, error)
|
||
Replace(table string, data Map) (sql.Result, error)
|
||
Save(table string, data Map) (sql.Result, error)
|
||
|
||
batchInsert(table string, list List, batch int, option uint8) (sql.Result, error)
|
||
BatchInsert(table string, list List, batch int) (sql.Result, error)
|
||
BatchReplace(table string, list List, batch int) (sql.Result, error)
|
||
BatchSave(table string, list List, batch int) (sql.Result, error)
|
||
|
||
Update(table string, data interface{}, condition interface{}, args ...interface{}) (sql.Result, error)
|
||
Delete(table string, condition interface{}, args ...interface{}) (sql.Result, error)
|
||
|
||
Table(tables string) (*gLinkOp)
|
||
From(tables string) (*gLinkOp)
|
||
}
|
||
|
||
// 数据库链接对象
|
||
type dbLink struct {
|
||
link Link
|
||
transaction *sql.Tx
|
||
master *sql.DB
|
||
slave *sql.DB
|
||
charl string
|
||
charr string
|
||
}
|
||
|
||
// 关联数组，绑定一条数据表记录
|
||
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
|
||
type List []Map
|
||
|
||
// 获得默认的数据库操作对象单例
|
||
func Instance () (Link, error) {
|
||
return instance(config.d)
|
||
}
|
||
|
||
// 获得指定配置项的数据库草最对象单例
|
||
func InstanceByGroup(groupName string) (Link, error) {
|
||
return instance(groupName)
|
||
}
|
||
|
||
// 根据配置项获取一个数据库操作对象单例
|
||
func instance (groupName string) (Link, error) {
|
||
instanceName := "gdb_instance_" + groupName
|
||
result := gcache.Get(instanceName)
|
||
if result == nil {
|
||
link, err := NewByGroup(groupName)
|
||
if err == nil {
|
||
gcache.Set(instanceName, link, 0)
|
||
return link, nil
|
||
} else {
|
||
return nil, err
|
||
}
|
||
} else {
|
||
return result.(Link), nil
|
||
}
|
||
}
|
||
|
||
// 使用默认选项进行连接，数据库集群配置项：default
|
||
func New() (Link, error) {
|
||
return NewByGroup(config.d)
|
||
}
|
||
|
||
// 根据数据库配置项创建一个数据库操作对象
|
||
func NewByGroup(groupName string) (Link, error) {
|
||
config.RLock()
|
||
defer config.RUnlock()
|
||
|
||
if len(config.c) < 1 {
|
||
return nil, errors.New("empty database configuration")
|
||
}
|
||
if list, ok := config.c[groupName]; 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 {
|
||
// 默认配置项的角色为master
|
||
masterList = append(masterList, list[i])
|
||
}
|
||
}
|
||
if len(masterList) < 1 {
|
||
return nil, errors.New("at least one master node configuration's need to make sense")
|
||
}
|
||
masterNode := getConfigNodeByPriority(&masterList)
|
||
var slaveNode *ConfigNode
|
||
if len(slaveList) > 0 {
|
||
slaveNode = getConfigNodeByPriority(&slaveList)
|
||
}
|
||
return newLink(masterNode, slaveNode)
|
||
} else {
|
||
return nil, errors.New(fmt.Sprintf("empty database configuration for item name '%s'", groupName))
|
||
}
|
||
}
|
||
|
||
// 根据单点数据库配置获得一个数据库草最对象
|
||
func NewByConfigNode(node ConfigNode) (Link, error) {
|
||
return newLink (&node, nil)
|
||
}
|
||
|
||
// 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
|
||
func getConfigNodeByPriority (cg *ConfigGroup) *ConfigNode {
|
||
if len(*cg) < 2 {
|
||
return &(*cg)[0]
|
||
}
|
||
var total int
|
||
for i := 0; i < len(*cg); i++ {
|
||
total += (*cg)[i].Priority * 100
|
||
}
|
||
r := grand.Rand(0, total)
|
||
min := 0
|
||
max := 0
|
||
for i := 0; i < len(*cg); i++ {
|
||
max = min + (*cg)[i].Priority * 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
|
||
}
|
||
|
||
// 创建数据库链接对象
|
||
func newLink (masterNode *ConfigNode, slaveNode *ConfigNode) (Link, error) {
|
||
var link Link
|
||
switch masterNode.Type {
|
||
case "mysql":
|
||
link = Link(&mysqlLink{})
|
||
|
||
case "pgsql":
|
||
link = Link(&pgsqlLink{})
|
||
|
||
default:
|
||
return nil, errors.New(fmt.Sprintf("unsupported db type '%s'", masterNode.Type))
|
||
}
|
||
master, err := link.Open(masterNode)
|
||
if err != nil {
|
||
glog.Fatal(err)
|
||
}
|
||
slave := master
|
||
if slaveNode != nil {
|
||
slave, err = link.Open(slaveNode)
|
||
if err != nil {
|
||
glog.Fatal(err)
|
||
}
|
||
}
|
||
link.setLink(link)
|
||
link.setMaster(master)
|
||
link.setSlave(slave)
|
||
link.setQuoteChar(link.getQuoteCharLeft(), link.getQuoteCharRight())
|
||
return link, nil
|
||
}
|
||
|
||
// 设置master链接对象
|
||
func (l *dbLink) setMaster(master *sql.DB) {
|
||
l.master = master
|
||
}
|
||
|
||
// 设置slave链接对象
|
||
func (l *dbLink) setSlave(slave *sql.DB) {
|
||
l.slave = slave
|
||
}
|
||
|
||
// 设置当前数据库类型引用字符
|
||
func (l *dbLink) setQuoteChar(left string, right string) {
|
||
l.charl = left
|
||
l.charr = right
|
||
}
|
||
|
||
// 设置挡脸操作的link接口
|
||
func (l *dbLink) setLink(link Link) {
|
||
l.link = link
|
||
}
|
||
|