标签：png root 数据 incr username panic 语法 word fun
一、mysql操作基本语法
1、创建名称nulige的数据库
CREATE DATABASE nulige DEFAULT CHARSET utf8 COLLATE utf8_general_ci;<br><br>use nulige |
2、建表，Id自增
create table user_info( nid int not null auto_increment primary key, username varchar(20), departname varchar(20), create_time timestamp default "0000-00-00 00:00:00"); |
3、往表中插入数据
INSERT INTO user_info (username,departname,create_time) VALUES ("nulige","行政部","2019-1-13 12:23:00");INSERT INTO user_info (username,departname,create_time) VALUES ("jojo","财务部","2019-1-14 1:23:00");INSERT INTO user_info (username,departname,create_time) VALUES ("huhui","销售部","2019-1-15 2:23:00"); |
4、查询表中内容
mysql> select * from user_info;+-----+----------+------------+---------------------+| nid | username | departname | create_time |+-----+----------+------------+---------------------+| 1 | nulige | 行政部 | 2019-01-13 12:23:00 || 2 | jojo | 财务部 | 2019-01-14 01:23:00 || 3 | huhui | 销售部 | 2019-01-15 02:23:00 |+-----+----------+------------+---------------------+3 rows in set (0.00 sec) |
5、删除数据库
mysql> drop database nulige;Query OK, 1 row affected (0.01 sec) |
6、清空表中数据，保留表结构
mysql> delete from user_info;Query OK, 5 rows affected (0.00 sec) |
二、mysql的增，删，改，查
2.1、增 (备注：往表中插入一条数据)
package mainimport ( "database/sql" "fmt" //调用mysql初始化包 _ "github.com/go-sql-driver/mysql")func main() { db, err := sql.Open("mysql", "root:qwe!23@tcp(127.0.0.1:3306)/nulige?charset=utf8") if err != nil { panic(err) } //fmt.Println(db.Ping()) 检查是否连接成功数据库 stmt, err := db.Prepare("INSERT user_info SET username=?,departname=?,create_time=?") if err != nil { fmt.Println(err) return } res, err := stmt.Exec("eeee", "采购部", "2019-1-29") id, err := res.LastInsertId() if err != nil { panic(err) } fmt.Println(id)} |
执行结果：
2.2、删
示例：
package mainimport ( "database/sql" "fmt" //调用mysql初始化包 _ "github.com/go-sql-driver/mysql")func main() { db, err := sql.Open("mysql", "root:qwe!23@tcp(127.0.0.1:3306)/nulige?charset=utf8") if err != nil { panic(err) } stmt, err := db.Prepare("DELETE FROM user_info WHERE nid=?") check(err) res, err := stmt.Exec(5) check(err) num, err := res.RowsAffected() check(err) fmt.Println(num) stmt.Close()}func check(err error) { if err != nil { fmt.Println(err) panic(err) }} |
执行结果：
2.3、改（更新）
原数据：
更新数据示例：
package mainimport ( "database/sql" "fmt" //调用mysql初始化包 _ "github.com/go-sql-driver/mysql")func main() { db, err := sql.Open("mysql", "root:qwe!23@tcp(127.0.0.1:3306)/nulige?charset=utf8") if err != nil { panic(err) } //fmt.Println(db.Ping()) 检查是否连接成功数据库 stmt, err := db.Prepare("update user_info SET username=? where nid=?") if err != nil { fmt.Println(err) return } res, err := stmt.Exec("dddd", 5) id, err := res.RowsAffected() if err != nil { panic(err) } fmt.Println(id)} |
执行结果： 把username:cccc,修改成dddd
2.4、查
示例 ： 查id=? 的一条记录
package mainimport ( "database/sql" "fmt" //调用mysql初始化包 _ "github.com/go-sql-driver/mysql")func main() { db, err := sql.Open("mysql", "root:qwe!23@tcp(127.0.0.1:3306)/nulige?charset=utf8") if err != nil { panic(err) } rows, err := db.Query(" SELECT * FROM user_info where nid=3") if err != nil { panic(err) } for rows.Next() { var nid int var username string var department string var create_time string err = rows.Scan(&nid, &username, &department, &create_time) fmt.Println(nid, username, department, create_time) }} |
#执行结果：
|
1
|
3 huhui 销售部 2019-01-15 02:23:00 |
示例2：查看所有记录
package mainimport ( "database/sql" "fmt" //调用mysql初始化包 _ "github.com/go-sql-driver/mysql")func main() { db, err := sql.Open("mysql", "root:qwe!23@tcp(127.0.0.1:3306)/nulige?charset=utf8") if err != nil { panic(err) } rows, err := db.Query(" SELECT * FROM user_info") if err != nil { panic(err) } for rows.Next() { var nid int var username string var department string var create_time string err = rows.Scan(&nid, &username, &department, &create_time) fmt.Println(nid, username, department, create_time) }} |
执行结果：
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1 nulige 行政部 2019-01-13 12:23:002 jojo 财务部 2019-01-14 01:23:003 huhui 销售部 2019-01-15 02:23:004 aaaa 销售部 2019-01-15 02:23:005 dddd 销售部 2019-01-15 02:23:006 eeee 采购部 2019-01-29 00:00:00 |
标签：png root 数据 incr username panic 语法 word fun
原文地址：https://www.cnblogs.com/igoodful/p/12804833.html
