1 依赖准备
mysql 8添加:
XML
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.29</version>
</dependency>
mysql 5 添加:
XML
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.36</version>
</dependency>
当然为了避免下载,可以直接去你的本地仓库查看你以前下过什么版本的依赖
2 连接 mysql 数据库并进行数据操作
这里的driver 换成对应自己版本的驱动
mysql 8 就是 com.mysql.cj.jdbc.Driver
mysql 5 就是 com.mysql.jdbc.Driver
这里的 url 一样换成自己的,若是在服务器上就换成服务器 ip,若在本地就用 localhost 就可以
这里只要能打印出连接,能添加进数据就算成功,其余的无非是 Java 连接数据库的操作了,大差不差了 ,有兴趣的可以自己往下加需求
这里的的数据库结构是
建表语句:
sql
show databases ;
create database kb23test;
use kb23test;
create table student(
id int,
name varchar(32),
age int
);
select * from student;
Scala
package mysqlstu
import java.sql.{Connection, DriverManager, PreparedStatement, ResultSet}
class MysqlDemo {
// var driver : String = "com.mysql.jdbc.Driver"
var driver : String = "com.mysql.cj.jdbc.Driver"
// var url = "jdbc:mysql://127.0.0.1:3306"
var url = "jdbc:mysql://39.107.230.113:3306"
var user = "root"
var pwd = "100860"
var connection : Connection = null
def this(driver : String,url : String,user : String,pwd : String){
this()
this.driver = driver
this.url = url
this.user = user
this.pwd = pwd
}
def conn : Connection={
Class.forName(driver)
connection = DriverManager.getConnection(url,user,pwd)
connection
}
def insert():Int = {
val insertSql = "insert into kb23test.student(id,name,age) values(1,'jojo',12)"
if (connection == null) conn
val i : Int = connection.createStatement().executeUpdate(insertSql)
i
}
def insert(id:Int,name:String,age:Int):Int = {
val insertSql = "insert into kb23test.student(id,name,age) values(?,?,?)"
if (connection == null) conn
val pstm : PreparedStatement = connection.prepareStatement(insertSql)
pstm.setInt(1,id)
pstm.setString(2,name)
pstm.setInt(3,age)
val i : Int = pstm.executeUpdate()
i
}
def update(id:Int,name:String,age:Int):Int = {
val insertSql = "update kb23test.student set name = ?,age = ? where id = ?"
if (connection == null) conn
val pstm : PreparedStatement = connection.prepareStatement(insertSql)
pstm.setInt(3,id)
pstm.setString(1,name)
pstm.setInt(2,age)
val i : Int = pstm.executeUpdate()
i
}
def select():Unit={
val selectSql = "select id,name,age from kb23test.student"
if (connection == null)conn
val rs : ResultSet = connection.createStatement().executeQuery(selectSql)
while(rs.next()){
val id : Int = rs.getInt("id")
val name : String = rs.getString("name")
val age : Int = rs.getInt("age")
println("学号:%d 姓名:%s 年龄:%d".format(id,name,age))
}
}
def select(name:String):Unit={
val selectSql = "select id,name,age from kb23test.student where name like concat('%',?,'%')"
if (connection == null)conn
val pstm = connection.prepareStatement(selectSql)
pstm.setString(1,name)
val rs : ResultSet = pstm.executeQuery()
while(rs.next()){
val id : Int = rs.getInt("id")
val name : String = rs.getString("name")
val age : Int = rs.getInt("age")
println("学号:%d 姓名:%s 年龄:%d".format(id,name,age))
}
}
}
object MysqlDemo{
def main(args: Array[String]): Unit = {
val mysqlDemo = new MysqlDemo
println(mysqlDemo.conn)
// println(mysqlDemo.insert())
// println(mysqlDemo.insert(2,"dio",142))
// println(mysqlDemo.update(2,"dio",112))
// mysqlDemo.select("d")
mysqlDemo.select()
}
}
3 隐式类形式去实现连接 mysql
Scala
package mysqlstu
import java.sql.Connection
class MysqlDemo2 {
// var driver : String = "com.mysql.jdbc.Driver"
var driver: String = "com.mysql.cj.jdbc.Driver"
// var url = "jdbc:mysql://127.0.0.1:3306"
var url = "jdbc:mysql://39.107.230.113:3306"
var user = "root"
var pwd = "100860"
def this(driver: String, url: String, user: String, pwd: String) {
this()
this.driver = driver
this.url = url
this.user = user
this.pwd = pwd
}
}
object MysqlDemo2 {
def main(args: Array[String]): Unit = {
val demo = new MysqlDemo2()
import mysqlstu.MysqlUtils._
demo.insert(3,"kk",11)
}
}
Scala
package mysqlstu
import java.sql.{Connection, DriverManager, PreparedStatement}
object MysqlUtils {
implicit class Mysqlop(mysqlDemo2: MysqlDemo2){
private var connection:Connection = _
private def conn():Unit={
Class.forName(mysqlDemo2.driver)
connection = DriverManager.getConnection(mysqlDemo2.url,mysqlDemo2.user,mysqlDemo2.pwd)
}
def insert(id:Int,name:String,age:Int):Int = {
val insertSql = "insert into kb23test.student(id,name,age) values(?,?,?)"
if (connection == null) conn
val pstm : PreparedStatement = connection.prepareStatement(insertSql)
pstm.setInt(1,id)
pstm.setString(2,name)
pstm.setInt(3,age)
val i : Int = pstm.executeUpdate()
i
}
}
}