mysql insert update delete finished

.idea/sqldialects.xml

@@ -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>

mysql/mysql_insert_update_delete.go

@@ -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)
+
+}

mysql/mysql_rowquery.go

@@ -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")
 }