gosql

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gosql

A golang ORM

gosql 是一个数据库的golang库

Why build this wheels

几乎是翻遍github上所有开源的使用golang实现的操作数据库类)使用起来总有不顺手的地方,例如:

gorm不支持读写分离,关联表使用频率少

gendry 是didi开源的一款,比较简洁但部分语法怪异 如group by 和 limit 依赖字段的约定

sqlx 相比起来不错,但语法不够简洁,不支持读写分离,

gosql 目前仅支持mysql （关键是`符号的处理，以及一些特殊语法，后期可能会考虑兼容pgsql等

本数据库参阅了大量现有数据库架构,参阅各种文献,自定义语法习惯,从零实现

其中灵感来自:分模块的灵感来自gendry,标签读取部分参考gorm,拼装sql的语法来自于我之前写的php的操作db库

Structure 结构

• db.go: defined base struct define 基本结构定义
• pool.go: db manger 管理db
• session.go: session and maping to model 会话和模型
• builder.go: for building SQL 构建sql
• scanner/*: mapping struct and scan 映射模型

Feature 功能

• Versatile 功能多样的
• Unlimited nesting query 查询条件无限嵌套
• Reading and Writing Separation 读写分离

Builder of DEMO 例子

为了展示gosql的能力,先展示个例子: Let's look a demo:

SELECT DISTINCT * FROM `tbl1`.`t1` JOIN `tbl3` ON `a` = `b`
WHERE (`t1`.`status` = ?
  AND `type` = ?
  AND `sts` IN (?, ?, ?, ?)
  AND `sts2` IN (?)
  AND (`a` = ? AND `b` = ?)
  AND aaa = 999
  AND ccc = ?
  AND `a` LIKE ? AND EXISTS (SELECT 1)
  AND EXISTS (SELECT * FROM `tbl2`.`t2` WHERE `xx` = ?)
) GROUP BY `id` HAVING `ss` = ? ORDER BY `id desc`, `id asc` LIMIT 10, 30
FOR UPDATE

    s := builder.New()
    s.Flag("DISTINCT")
    s.Field("*")
    s.Table("tbl1.t1")
    s.Where("t1.status", "0")
    s.Where("type", "A")
    s.Where("[in]sts", []string{"1", "2", "3", "4"})
    s.Where("[in]sts2", 1)
    s.Where(func(s *builder.Clause) {
        s.Where("a", "200")
        s.Where("b", "100")
    })
    s.Where("aaa = 999")
    s.Where("[#]ccc = ?", 888)
    s.Join("tbl3", "a", "=", "b")
    s.Having("ss", "1")
    s.Where("[~]a", "AA")
    s.Where("[exists]", "select 1")
    s.Where("[exists]", func(s *builder.SQLSegments) {
        s.Table("tbl2.t2")
        s.Where("xx", 10000)
    })
    s.GroupBy("id")
    s.OrderBy("id desc", "id asc")
    s.Limit(30)
    s.Offset(10)
    s.ForUpdate()
    fmt.Println(s.BuildSelect())

How to use 如何使用

1. Init db

db,err := gosql.NewCluster(
    gosql.AddDb("mysql","user:pasword@tcp(127.0.0.1:3306)/test?parseTime=true&readTimeout=3s&writeTimeout=3s&timeout=3s"),
)
if err != nil {
    fmt.Println(err)
}

Doc 文档

Auto

Exec

INSERT: db.Insert(dst interface{}, opts ...Option) (Result, error)

type UserModel struct{
    ID int `db:"id"`
    Name string ``
}
func (u *UserModel) TableName() {
    return "my_world"
}
user := &WorldModel{}
user.Name = "jack"
ret,err := db.Insert(&user)

REPALCE: db.Replace(dst interface{}, opts ...Option) (Result, error)

type UserModel struct{
    ID int `db:"id"`
    Name string ``
}
func (u *UserModel) TableName() {
    return "my_world"
}
user := &WorldModel{}
user.Name = "jack"
ret,err := db.Replace(&user,gosql.Where("id",1))

UPDATE: Update(dst interface{}, opts ...Option) (Result, error)

type UserModel struct{
    ID int `db:"id"`
    Name string ``
}
func (u *UserModel) TableName() {
    return "my_world"
}
user := &WorldModel{}
user.Name = "jack Ma"
ret,err := db.Update(&user,gosql.Where("id",1))

DELETE: db.Delete(dst interface{}, opts ...Option) (Result, error)

type UserModel struct{
    ID int `db:"id"`
    Name string ``
}
func (u *UserModel) TableName() {
    return "my_world"
}
user := &WorldModel{}
ret,err := db.Delete(&user,gosql.Where("id",1))
//sql: delete from my_world where id = 1

QUERY

Get a record: db.Fetch(dst interface{}, opts ...Option) error

Get multiple records: db.FetchAll(dst interface{}, opts ...Option) error

OPTION

WHERE

gosql.Where("id",1)

eq sql:

id = 1

gosql.Where("age[>]",18)

eq sql:

age > 18

gosql.Where("id[in]",[]int{1,2})

eq sql:

id in (1,2)

gosql.Where("id[!in]",[]int{1,2})

eq sql:

id not in (1,2)

gosql.Where("name[~]","ja%")

eq sql:

name like 'ja%'

gosql.Where("name[!~]","ja%")

eq sql:

name not like 'ja%'

条件表达式 [?]

[=] equal

gosql.Where("[=]id",1)
//sql: id = 1

[!=] not equal

gosql.Where("[!=]id",1)
//sql: id != 1

[>] greater than

gosql.Where("[>]id",1)
//sql: id > 1

[>=] greater or equal

gosql.Where("[>=]id",1)
//sql: id >= 1

[<] less

gosql.Where("[<]id",1)
//sql: id < 1

[<=] less or equal

gosql.Where("[<=]id",1)
//sql: id <= 1

[in] in

gosql.Where("[in]id",[]int{1,2})
//sql: id in (1,2)

[!in] not in

gosql.Where("[!in]id",[]int{1,2})
//sql: id not in (1,2)

[is] is

gosql.Where("[is]name",nil)
//sql: name is null

[!is] not is

gosql.Where("[!is]name","")
//sql: id is not ""

[exists] exists

gosql.Where("[exists]name","select 1")
//sql: name exists(select 1)

[!exists] not exists

gosql.Where("[!exists]name","select 1")
//sql: name not exists(select 1)

[#] sql

gosql.Where("[#]age=age-1")
//sql: age = age-1 

Raw SQL: db.Query()

rows,err := db.Query("select * from world where id = ?",1)
//sql: select * from world where id = 1

select master or slave

change to master: db.Master()

db := db.Master()
db.Fetch(...)

change to slave: db.Slave()

db := db.Slave()
db.Fetch(...)

builder of API

创建语句

用法 builder.New()

例子 s := builder.New()

设置Flag builder.Flag(f string)

设置一个falg,非必须

用法 s.Flag(string)

例子 s := builder.New().Flag("")

指定字段 builder.Field(fields string)

指定查询字段 不指定 默认为 *

用法 s.Field("*")

指定表名 builder.Table(tbl string)

用法 s.Table("tbl1.t1")

查询条件

• 普通查询 s.Where(key string, val inferface{})

• 等于查询

用法 s.Where("t1.status", "0")

等效SQL t1.status = 0

• 不等于查询

用法 s.Where("[!=]t1.status", "0")

等效SQL t1.status != 0

• IN查询

用法 s.Where("[in]sts", []string{"a", "b", "c"})

等效SQL t1.type in (a,b,c)

• NOT IN查询

用法 s.Where("[!in]sts", []string{"a", "b", "c"})

等效SQL t1.type not in (a,b,c)

• 复杂条件查询

用法 .Where(func(s *builder.Clause){}

s.Where("[!]t1.a",1).Where(func(s *builder.Clause){
    s.Where("t1.b",1)
    s.OrWhere("t1.c",1)
})

等效SQL t1.a != 1 and (t1.b = 1 or t1.c = 1)

• GROUP BY 分类

用法 s.GroupBy("id")

等效SQL group by id

• ORDER BY 排序

用法 s.OrderBy("id desc", "age asc")

等效SQL order by id desc

• 限制条数

用法 s.Limit(30)

等效SQL limit 30

• 偏移条数

用法 s.Offset(10)

等效SQL offset 30