Golang语言学习从入门到实战----Go操作Mysql实现增删改查
Hello，我是普通Gopher，00后男孩，极致的共享主义者，想要成为一个终身学习者。专注于做最通俗易懂的计算机基础知识类公众号。每天推送Golang技术干货，内容起于K8S而不止于K8S，涉及Docker、微服务、DevOps、数据库、虚拟化等云计算内容及SRE经验总结
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建库建表
新建person表
create table person(
user_id int primary key auto_increment,
username varchar(260),
sex varchar(260),
email varchar(260)
);
Golang操作Mysql数据库
安装sqlx
go get github.com/jmoiron/sqlx,
sqlx是一个go语言包，在内置database／sql包之上增加了很多扩展，简化数据库操作代码的书写
代码
定义初始化mysql函数:
func init() {
database, err := sqlx.Open("mysql", "root:123456@tcp(192.168.0.131:3306)/goTest")
if err != nil {
fmt.Println("open mysql failed,", err)
return
}
Db = database
}
注意:
MySQL ERROR 1130 (HY000): Host 'XXXX' is not allowed to connect to this MySQL server要Mysql开启远程连接
use mysql;
update user set host = '%' where user = 'root';
flush privileges;
重启mysql
Insert
package main
import (
"fmt"
_ "github.com/go-sql-driver/mysql"
"github.com/jmoiron/sqlx"
)
type Person struct {
UserId int `db:"user_id"`
Username string `db:"username"`
Sex string `db:"sex"`
Email string `db:"email"`
}
var Db *sqlx.DB
func init() {
database, err := sqlx.Open("mysql", "root:123456@tcp(192.168.0.131:3306)/goTest")
if err != nil {
fmt.Println("open mysql failed,", err)
return
}
Db = database
}
func main() {
r, err := Db.Exec("insert into person(username, sex, email)values(?, ?, ?)", "stu001", "man", "[email protected]")
if err != nil {
fmt.Println("exec failed, ", err)
return
}
id, err := r.LastInsertId()
if err != nil {
fmt.Println("exec failed, ", err)
return
}
fmt.Println("insert succ:", id)
}
mysql> select * from person;
+---------+----------+------+--------------+
| user_id | username | sex | email |
+---------+----------+------+--------------+
| 1 | stu001 | man | stu01@qq.com |
+---------+----------+------+--------------+
1 row in set (0.00 sec)
mysql>
插入数据成功!
Update
package main
import (
"fmt"
_ "github.com/go-sql-driver/mysql"
"github.com/jmoiron/sqlx"
)
type Person struct {
UserId int `db:"user_id"`
Username string `db:"username"`
Sex string `db:"sex"`
Email string `db:"email"`
}
var Db *sqlx.DB
func init() {
database, err := sqlx.Open("mysql", "root:123456@tcp(192.168.0.131:3306)/goTest")
if err != nil {
fmt.Println("open mysql failed,", err)
return
}
Db = database
}
func main() {
_, err := Db.Exec("update person set username=? where user_id=?", "stu003", 1)
if err != nil {
fmt.Println("exec failed, ", err)
return
}
fmt.Println("修改成功")
}
mysql> select * from person;
+---------+----------+------+--------------+
| user_id | username | sex | email |
+---------+----------+------+--------------+
| 1 | stu003 | man | stu01@qq.com |
+---------+----------+------+--------------+
1 row in set (0.00 sec)
mysql>
Select
package main
import (
"fmt"
_ "github.com/go-sql-driver/mysql"
"github.com/jmoiron/sqlx"
)
type Person struct {
UserId int `db:"user_id"`
Username string `db:"username"`
Sex string `db:"sex"`
Email string `db:"email"`
}
var Db *sqlx.DB
func init() {
database, err := sqlx.Open("mysql", "root:123456@tcp(192.168.0.131:3306)/goTest")
if err != nil {
fmt.Println("open mysql failed,", err)
return
}
Db = database
}
func main() {
var person []Person
err := Db.Select(&person, "select user_id, username, sex, email from person where user_id=?", 1)
if err != nil {
fmt.Println("exec failed, ", err)
return
}
fmt.Println("select succ:", person)
}
输出:
select succ: [{1 stu003 man stu01@qq.com}]
Delete
package main
import (
"fmt"
_ "github.com/go-sql-driver/mysql"
"github.com/jmoiron/sqlx"
)
type Person struct {
UserId int `db:"user_id"`
Username string `db:"username"`
Sex string `db:"sex"`
Email string `db:"email"`
}
var Db *sqlx.DB
func init() {
database, err := sqlx.Open("mysql", "root:123456@tcp(192.168.0.131:3306)/goTest")
if err != nil {
fmt.Println("open mysql failed,", err)
return
}
Db = database
}
func main() {
_, err := Db.Exec("delete from person where user_id=?", 1)
if err != nil {
fmt.Println("exec failed, ", err)
return
}
fmt.Println("delete succ")
}
mysql> select * from person;
Empty set (0.00 sec)
mysql>
删除成功!