mysql insert update delete finished

main
Your Name 2024-07-19 00:07:50 +08:00
parent 6f19983df9
commit 65a48c079f
3 changed files with 121 additions and 5 deletions

View File

@ -1,6 +1,7 @@
<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="SqlDialectMappings">
<file url="file://$PROJECT_DIR$/mysql/mysql_insert.go" dialect="GenericSQL" />
<file url="file://$PROJECT_DIR$/mysql/mysql_rowquery.go" dialect="GenericSQL" />
</component>
</project>

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@ -0,0 +1,91 @@
package main
import (
"database/sql"
_ "github.com/go-sql-driver/mysql"
"log"
)
var database *sql.DB
func initDataBase() (err error) {
database, err = sql.Open("mysql", "root:123456@tcp(43.143.245.135:3306)/wangaodev")
if err != nil {
return err
}
err = database.Ping()
if err != nil {
return err
}
log.Println("Successfully connected to mysql")
database.SetMaxOpenConns(10)
database.SetMaxIdleConns(5)
return nil
}
// 插入数据
func insert(name, level string, status int) {
//1.写sql语句
sqlStr := `insert into user (name,level,status) values (?,?,?)`
//2.exec
ret, err := database.Exec(sqlStr, name, level, status)
if err != nil {
log.Println("insert error:", err)
return
}
//如果是插入数据的操作能够拿到插入数据的id
id, err := ret.LastInsertId()
if err != nil {
log.Println("get id failed:", err)
return
}
log.Println("id:", id)
}
// 更新数据
func update(name string, id int) {
//1.写sql语句
sqlStr := `update user set name=? where id=?`
//2.exec
ret, err := database.Exec(sqlStr, name, id)
if err != nil {
log.Println("insert error:", err)
return
}
//如果是插入数据的操作能够拿到插入数据的id
affectedNum, err := ret.RowsAffected()
if err != nil {
log.Println("update row failed:", err)
return
}
log.Println("affectedNum:", affectedNum)
}
//删除数据
func deleteRow(id int) {
sqlStr := `delete from user where id=?`
ret, err := database.Exec(sqlStr, id)
if err != nil {
log.Println("delete error:", err)
}
rowsAffected, err := ret.RowsAffected()
if err != nil {
log.Println("delete row failed:", err)
}
log.Println("rowsAffected:", rowsAffected)
}
func main() {
err := initDataBase()
if err != nil {
log.Fatalf("connect mysql failed,error:%v", err)
return
}
//insert("尹晨旭", "L2", 0)
//update("吴斌", 19)
deleteRow(19)
}

View File

@ -34,21 +34,44 @@ func initDb() (err error) {
// 表结构对象
type user struct {
id int
name string
age int
id int
name string
level string
status int
}
// 查询单行数据
func queryRow(id int) {
var u user
//查询单行记录的sql语句
sqlstr := "select id, name, age from user where id=?"
sqlstr := "select id,name,level,status from user where id=?"
//执行并且拿到结果
db.QueryRow(sqlstr, id).Scan(&u.id, &u.name, &u.age) //从链接池中拿一个连接出来去数据库查询单条记录,scan方法自动释放连接也就是必须调用scan方法
db.QueryRow(sqlstr, id).Scan(&u.id, &u.name, &u.level, &u.status) //从链接池中拿一个连接出来去数据库查询单条记录,scan方法自动释放连接也就是必须调用scan方法
fmt.Printf("user:%#v\n", u)
}
// 查询多行数据
func queryMultiRow(level string) error {
sqlstr := "select id,name,level,status from user where level=?"
rows, err := db.Query(sqlstr, level)
if err != nil {
log.Printf("query multiRow err %v\n", err)
return err
}
//非常重要.关闭rows持有的数据库连接
defer rows.Close()
for rows.Next() {
var u user
err = rows.Scan(&u.id, &u.name, &u.level, &u.status)
if err != nil {
log.Printf("scan err %v\n", err)
return err
}
fmt.Printf("user:%#v\n", u)
}
return nil
}
// go链接mysql示例
func main() {
err := initDb()
@ -57,4 +80,5 @@ func main() {
}
log.Println("init DB success.")
queryRow(2)
queryMultiRow("L1")
}