Scala JDBC 操作 Mysql

表结构

CREATE TABLE `scala_jdbc_test` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `name` varchar(32) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
  `age` tinyint(1) DEFAULT NULL,
  `address` varchar(255) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

插入测试数据

INSERT INTO `demo`.`scala_jdbc_test`(`id`, `name`, `age`, `address`) VALUES (1, 'zhangsan', 1, '北京');

依赖

<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>6.0.6</version>
</dependency>

代码

MysqlConnect

package com.yljphp.demo.learn

import java.sql.{Connection, DriverManager}

object MysqlConnect {

  private var connection: Connection = _

  private val driver = "com.mysql.cj.jdbc.Driver"
  private val url = "jdbc:mysql://ip:port/dbname?useUnicode=true&characterEncoding=utf-8&useSSL=false"
  private val username = ""
  private val password = ""

  /**
    * 创建mysql连接
    *
    * @return
    */
  def conn(): Connection = {

    if (connection == null) {
      println(this.driver)
      Class.forName(this.driver)
      connection = DriverManager.getConnection(this.url, this.username, this.password)
    }
    connection
  }
}

CRUD

val statement: Statement = MysqlConnect.conn().createStatement

  def delete(): Unit ={
    val resDelete = statement.executeUpdate("DELETE FROM `scala_jdbc_test` WHERE `id` = 2")
    println("删除数据，返回值=>" + resDelete)
  }

  def update(): Unit = {
    val resUpdate = statement.executeUpdate("UPDATE `scala_jdbc_test` SET `name` = '张三'WHERE `id` = 1")
    println("更新数据，返回值=>" + resUpdate)
  }

  def insert(): Unit = {
    val resInsert = statement.executeUpdate("INSERT INTO `scala_jdbc_test`(`name`, `age`, `address`) VALUES ( '李四', 2, '南京')")
    println("插入数据，返回值=>" + resInsert)
  }


  def select(): Unit = {
    val res: ResultSet = statement.executeQuery("select * from scala_jdbc_test")

    while (res.next) {

      val id = res.getString("id")
      val name = res.getString("name")
      val age = res.getString("age")
      val address = res.getString("address")

      println("查询数据")
      println("id=%s,name=%s,age=%s,address=%s".format(id, name, age, address))
    }
  }

测试

select()
println("==================")
insert()
select()
println("==================")
update()
select()
println("==================")
delete()
select()
println("==================")

参考

A Scala JDBC connection and SQL SELECT example
Scala JDBC 查询和更新MySQL
scala操作mysql数据库