go 连接操作MySQL

连接Mysql

1. 访问此网站搜索MySQL
2. 第一个就是按照指引运行

go get -u github.com\go-sql-driver\mysql

3. 导入包建立连接

package main

import (
	"database/sql"
	"fmt"
	"time"

	_ "github.com/go-sql-driver/mysql"
)

var db *sql.DB

func initdb() (err error) {
	db, err = sql.Open("mysql", "ellis:ellis@tcp(192.168.214.134:3306)/go_db?charset=utf8mb4&parseTime=True")
	if err != nil {
		return err
	}
	//尝试与数据库建立连接
	err = db.Ping()
	if err != nil {
		return err
	}
		// See "Important settings" section.
	db.SetConnMaxLifetime(time.Minute * 3)
	db.SetMaxOpenConns(10)
	//最大空闲
	db.SetMaxIdleConns(10)
	return nil
}

// ...

func main() {
	err := initdb()
	if err != nil {
		panic(err)
	}

}

插入数据

func(db *DB) Exec(query string,args...interface{})(Result,error)




package main

import (
	"database/sql"
	"fmt"
	"time"

	_ "github.com/go-sql-driver/mysql"
)

var db *sql.DB

func initdb() (err error) {
	db, err = sql.Open("mysql", "ellis:ellis@tcp(192.168.214.134:3306)/go_db?charset=utf8mb4&parseTime=True")
	if err != nil {
		return err
	}
	//尝试与数据库建立连接
	err = db.Ping()
	if err != nil {
		return err
	}
		// See "Important settings" section.
	db.SetConnMaxLifetime(time.Minute * 3)
	db.SetMaxOpenConns(10)
	//最大空闲
	db.SetMaxIdleConns(10)
	return nil
}

func insertValue(name string, password string) (result sql.Result, err error) {
	query := "insert into user_tbl(name,password) values(?,?)"

	result, err = db.Exec(query, name, password)
	if err != nil {
		fmt.Printf("err: %v\n", err)
	}
	fmt.Printf("result: %v\n", result)
	// 最后插入的ID
	fmt.Println(result.LastInsertId())

	return
}

// ...

func main() {
	err := initdb()
	if err != nil {
		panic(err)
	}

	insertValue("ellis", "ellis")
}

查询

• 单行查询使用QueryRow,详见selectOne函数

package main

import (
	"database/sql"
	"fmt"
	"time"

	_ "github.com/go-sql-driver/mysql"
)

var db *sql.DB

func initdb() (err error) {
	db, err = sql.Open("mysql", "ellis:ellis@tcp(192.168.214.134:3306)/go_db?charset=utf8mb4&parseTime=True")
	if err != nil {
		return err
	}
	//尝试与数据库建立连接
	err = db.Ping()
	if err != nil {
		return err
	}
		// See "Important settings" section.
	db.SetConnMaxLifetime(time.Minute * 3)
	db.SetMaxOpenConns(10)
	//最大空闲
	db.SetMaxIdleConns(10)
	return nil
}

type User struct {
	id       int
	name     string
	password string
}

func searchOne() {
	var user User
	db.QueryRow("select * from user_tbl where id=1").Scan(&user.id, &user.name, &user.password)

	fmt.Printf("user.id: %v\n", user.id)
}

// ...

func main() {
	err := initdb()
	if err != nil {
		panic(err)
	}
	searchOne()
}

• 查询多行

package main

import (
	"database/sql"
	"fmt"
	"time"

	_ "github.com/go-sql-driver/mysql"
)

var db *sql.DB

func initdb() (err error) {
	db, err = sql.Open("mysql", "ellis:ellis@tcp(192.168.214.134:3306)/go_db?charset=utf8mb4&parseTime=True")
	if err != nil {
		return err
	}
	//尝试与数据库建立连接
	err = db.Ping()
	if err != nil {
		return err
	}
	// See "Important settings" section.
	db.SetConnMaxLifetime(time.Minute * 3)
	db.SetMaxOpenConns(10)
	//最大空闲
	db.SetMaxIdleConns(10)
	return nil
}

type User struct {
	id       int
	name     string
	password string
}

func searchAll() {
	query := "select * from user_tbl"
	r, err := db.Query(query)
	defer r.Close()
	if err != nil {
		fmt.Printf("err: %v\n", err)
	} else {
		// 一行行的读
		for r.Next() {
			var u User
			r.Scan(&u.id, &u.name, &u.password)
			fmt.Printf("u: %v\n", u)
		}
	}
}

// ...

func main() {
	err := initdb()
	if err != nil {
		panic(err)
	}

	fmt.Printf("db: %v\n", db)
	searchAll()
}

更新

package main

import (
	"database/sql"
	"fmt"
	"time"

	_ "github.com/go-sql-driver/mysql"
)

var db *sql.DB

func initdb() (err error) {
	db, err = sql.Open("mysql", "ellis:ellis@tcp(192.168.214.134:3306)/go_db?charset=utf8mb4&parseTime=True")
	if err != nil {
		return err
	}
	//尝试与数据库建立连接
	err = db.Ping()
	if err != nil {
		return err
	}
	// See "Important settings" section.
	db.SetConnMaxLifetime(time.Minute * 3)
	db.SetMaxOpenConns(10)
	//最大空闲
	db.SetMaxIdleConns(10)
	return nil
}

type User struct {
	id       int
	name     string
	password string
}

func update() {
	sql := "update user_tbl set name=? where id=?"
	r, err := db.Exec(sql, "vv", 1)
	if err != nil {
		fmt.Printf("err: %v\n", err)
	} else {
		//打印影响行数
		fmt.Println(r.RowsAffected())
	}
}

func main() {
	err := initdb()
	if err != nil {
		panic(err)
	}

	update()
}

删除

package main

import (
	"database/sql"
	"fmt"
	"time"

	_ "github.com/go-sql-driver/mysql"
)

var db *sql.DB

func initdb() (err error) {
	db, err = sql.Open("mysql", "ellis:ellis@tcp(192.168.214.134:3306)/go_db?charset=utf8mb4&parseTime=True")
	if err != nil {
		return err
	}
	//尝试与数据库建立连接
	err = db.Ping()
	if err != nil {
		return err
	}
	// See "Important settings" section.
	db.SetConnMaxLifetime(time.Minute * 3)
	db.SetMaxOpenConns(10)
	//最大空闲
	db.SetMaxIdleConns(10)
	return nil
}

type User struct {
	id       int
	name     string
	password string
}

func delete() {
	sql := "delete from user_tbl where id=?"
	r, err := db.Exec(sql, 1)
	if err != nil {
		fmt.Printf("err: %v\n", err)
	} else {
		//打印影响行数
		fmt.Println(r.RowsAffected())
	}
}

func main() {
	err := initdb()
	if err != nil {
		panic(err)
	}

	delete()
}