泽民博客 ☰ Menu

go mysql driver

go-mysql-server是一个golang 的mysql server 协议实现包，使用此工具我们可以用来做好多方便的东西



基于mysql 协议暴露自己的本地文件为sql 查询
基于mysql 协议灵活的暴露rest 服务的接口查询为sql
基于mysql 协议方便对于一些数据的查询分析
基于mysql 协议暴露k8s 资源为sql 查询（类似fuse 文件系统？）
基于mysql 协议查询git仓库代码
。。。
一个简单的demo
一个golang 版的简单mysql server



项目初始化（go mod ）
go mod init github.com/rongfengliang/my-mysqlserver
main.go
package main



import (
“time”



“gopkg.in/src-d/go-mysql-server.v0”
“gopkg.in/src-d/go-mysql-server.v0/auth”
“gopkg.in/src-d/go-mysql-server.v0/mem”
“gopkg.in/src-d/go-mysql-server.v0/server”
“gopkg.in/src-d/go-mysql-server.v0/sql”
)



// Example of how to implement a MySQL server based on a Engine:
//
//
// > mysql --host=127.0.0.1 --port=5123 -u user -ppass db -e "SELECT * FROM mytable"
// +----------+-------------------+-------------------------------+---------------------+
// | name | email | phone_numbers | created_at |
// +----------+-------------------+-------------------------------+---------------------+
// | John Doe | john@doe.com | ["555-555-555"] | 2018-04-18 09:41:13 |
// | John Doe | johnalt@doe.com | [] | 2018-04-18 09:41:13 |
// | Jane Doe | jane@doe.com | [] | 2018-04-18 09:41:13 |
// | Evil Bob | evilbob@gmail.com | ["555-666-555","666-666-666"] | 2018-04-18 09:41:13 |
// +----------+-------------------+-------------------------------+---------------------+
//
func main() {
engine := sqle.NewDefault()
engine.AddDatabase(createTestDatabase())
engine.AddDatabase(sql.NewInformationSchemaDatabase(engine.Catalog))



config := server.Config{
Protocol: “tcp”,
Address: “localhost:3306”,
Auth: auth.NewNativeSingle(“root”, “”, auth.AllPermissions),
}



s, err := server.NewDefaultServer(config, engine)
if err != nil {
panic(err)
}



s.Start()
}



func createTestDatabase() *mem.Database {
const (
dbName = “mydb”
tableName = “mytable”
)



db := mem.NewDatabase(dbName)
table := mem.NewTable(tableName, sql.Schema{
{Name: “name”, Type: sql.Text, Nullable: false, Source: tableName},
{Name: “email”, Type: sql.Text, Nullable: false, Source: tableName},
{Name: “phone_numbers”, Type: sql.JSON, Nullable: false, Source: tableName},
{Name: “created_at”, Type: sql.Timestamp, Nullable: false, Source: tableName},
})



db.AddTable(tableName, table)
ctx := sql.NewEmptyContext()
table.Insert(ctx, sql.NewRow(“John Doe”, “john@doe.com”, []string{“555-555-555”}, time.Now()))
table.Insert(ctx, sql.NewRow(“John Doe”, “johnalt@doe.com”, []string{}, time.Now()))
table.Insert(ctx, sql.NewRow(“Jane Doe”, “jane@doe.com”, []string{}, time.Now()))
table.Insert(ctx, sql.NewRow(“Evil Bob”, “evilbob@gmail.com”, []string{“555-666-555”, “666-666-666”}, time.Now()))
return db
}
添加依赖
go mod tidy
构建
go build my-server
运行
./my-server
连接查询
mysql -uroot -h127.0.0.1
效果



select * from mytable;
+———-+——————-+——————————-+———————+
| name | email | phone_numbers | created_at |
+———-+——————-+——————————-+———————+
| John Doe | john@doe.com | [“555-555-555”] | 2019-05-18 10:56:31 |
| John Doe | johnalt@doe.com | [] | 2019-05-18 10:56:31 |
| Jane Doe | jane@doe.com | [] | 2019-05-18 10:56:31 |
| Evil Bob | evilbob@gmail.com | [“555-666-555”,”666-666-666”] | 2019-05-18 10:56:31 |
说明
go-mysql-server 已经包好了好多内置的sql 函，同时我们也可以自己搞一些扩展开发，一个很强大的工具



参考资料
https://github.com/src-d/go-mysql-server



https://www.cnblogs.com/rongfengliang/p/10886794.html

https://github.com/melbahja/got



https://github.com/src-d/go-mysql-server



https://www.dolthub.com/blog/2020-02-14-implementing-indexed-joins/



https://www.dolthub.com/blog/2020-08-05-implementing-subqueries/


Category golang