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首頁 云原生多模數(shù)據(jù)庫 Lindorm 操作指南 寬表引擎（兼容HBase或Cassandra） 應(yīng)用開發(fā)教程 基于SQL的應(yīng)用開發(fā) 使用MySQL協(xié)議（推薦） 基于Java ORM框架MyBatis的應(yīng)用開發(fā)

基于Java ORM框架MyBatis的應(yīng)用開發(fā)

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Lindorm寬表引擎提供了一系列基于MySQL協(xié)議的連接方式，涉及多種語言和多種框架，其中包括Java對象關(guān)系映射（ORM）框架MyBatis。MyBatis框架實現(xiàn)了SQL與代碼的解耦，使數(shù)據(jù)管理變得更加靈活和方便。如果您習慣使用MyBatis框架進行數(shù)據(jù)開發(fā)，或想要對SQL語句進行統(tǒng)一管理和優(yōu)化，推薦您通過Java ORM框架MyBatis連接和使用Lindorm寬表引擎。

前提條件

操作步驟

  1. 添加MyBatis和MySQL JDBC Driver依賴。以Maven項目為例，在pom.xml文件的dependencies中添加以下依賴項：

    <dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis</artifactId>
    <version>3.5.14</version>
</dependency>
<dependency>
    <groupId>com.mysql</groupId>
    <artifactId>mysql-connector-j</artifactId>
    <version>8.0.33</version>
</dependency>

  2. 在resources目錄下，創(chuàng)建mybatis-config.xml基礎(chǔ)配置文件，用于保存Lindorm寬表引擎相關(guān)連接信息。

    <?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "https://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.cj.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://ld-uf6k8yqb741t3****-proxy-sql-lindorm-public.lindorm.rds.aliyuncs.com:33060/default"/>
                <property name="username" value="root"/>
                <property name="password" value="test"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper class="org.example.UserMapper"/>
    </mappers>
</configuration>

    參數(shù)說明

    參數(shù)

    說明

    url

    MySQL協(xié)議的Java JDBC連接地址及需要連接的數(shù)據(jù)庫。格式為jdbc:mysql://<MySQL兼容地址>/<數(shù)據(jù)庫名>。默認連接default數(shù)據(jù)庫。

    如何獲取MySQL兼容地址，請參見查看連接地址。

    重要

    • 如果應(yīng)用部署在ECS實例，建議您通過專有網(wǎng)絡(luò)訪問Lindorm實例，可獲得更高的安全性和更低的網(wǎng)絡(luò)延遲。

    • 如果應(yīng)用部署在本地，在通過公網(wǎng)連接Lindorm實例前，需在控制臺開通公網(wǎng)地址。開通方式：在控制臺選擇數(shù)據(jù)庫連接 > 寬表引擎，在寬表引擎頁簽單擊開通公網(wǎng)地址。

    • 通過專有網(wǎng)絡(luò)訪問Lindorm實例，url中請?zhí)顚慚ySQL兼容地址對應(yīng)的專有網(wǎng)絡(luò)地址。通過公網(wǎng)訪問Lindorm實例，url中請?zhí)顚慚ySQL兼容地址對應(yīng)的公網(wǎng)地址。

    username

    如果您忘記用戶密碼，可以通過Lindorm寬表引擎的集群管理系統(tǒng)修改密碼。具體操作，請參見修改用戶密碼。

    password

  3. 創(chuàng)建對象類。

    package org.example;

import java.nio.charset.StandardCharsets;
import java.sql.Date;
import java.sql.Timestamp;

public class User {
  private int userId;
  private String userName;
  private double height;
  private long score;
  private Timestamp createTime;
  private Date birthday;

  private byte[] digest;

  public User(int userId, String userName, double height, long score,
      Timestamp createTime, Date birthday, byte[] digest) {
    this.userId = userId;
    this.userName = userName;
    this.height = height;
    this.score = score;
    this.createTime = createTime;
    this.birthday = birthday;
    this.digest = digest;
  }

  public int getUserId() {
    return userId;
  }

  public void setUserId(int userId) {
    this.userId = userId;
  }

  public String getUserName() {
    return userName;
  }

  public void setUserName(String userName) {
    this.userName = userName;
  }

  public double getHeight() {
    return height;
  }

  public void setHeight(double height) {
    this.height = height;
  }

  public long getScore() {
    return score;
  }

  public void setScore(long score) {
    this.score = score;
  }

  public Timestamp getCreateTime() {
    return createTime;
  }

  public void setCreateTime(Timestamp createTime) {
    this.createTime = createTime;
  }

  public Date getBirthday() {
    return birthday;
  }

  public void setBirthday(Date birthday) {
    this.birthday = birthday;
  }

  public byte[] getDigest() {
    return digest;
  }

  public void setDigest(byte[] digest) {
    this.digest = digest;
  }

  @Override
  public String toString() {
    return "User{" + "userId=" + userId + ", userName='" + userName + '\'' + ", height=" + height + ", score=" + score + ", createTime=" + createTime + ", birthday=" + birthday + ", digest=" + new String(digest, StandardCharsets.UTF_8) + '}';
  }
}

  4. 創(chuàng)建MyBatis框架的Mapper，用于定義SQL語句與業(yè)務(wù)代碼的映射關(guān)系。

    import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;

package org.example;

import java.util.List;

public interface UserMapper {

  @Update("create table if not exists demo_user(`id` INT, `name` VARCHAR, `height` DOUBLE, `score` BIGINT, `createtime` TIMESTAMP, `birthday` DATE, digest VARBINARY,primary key(id))")
  void createUserTable();

  @Update("drop table if exists demo_user")
  void dropUserTable();

  @Insert("upsert into demo_user(`id`,`name`,`height`,`score`,`createtime`,`birthday`,`digest`) values(#{userId},#{userName},#{height},#{score},#{createTime},#{birthday},#{digest})")
  int upsertUser(User user);

  @Delete("delete from demo_user where `id` = #{userId}")
  int deleteUser(@Param("userId") int userId);

  @Select("select * from demo_user where `id` = #{userId}")
  User selectOneUser(@Param("userId") int userId);

  @Select("select * from demo_user")
  List<User> selectAllUser();
}

  5. 編寫業(yè)務(wù)代碼。

    package org.example;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.sql.Date;
import java.sql.Timestamp;

public class MybatisDemo {
  public static void main(String[] args) throws Exception {
    String resource = "mybatis-config.xml";
    InputStream inputStream = Resources.getResourceAsStream(resource);
    SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(
        inputStream);
    try (SqlSession session = sqlSessionFactory.openSession()) {
      UserMapper mapper = session.getMapper(UserMapper.class);

      //create user table
      mapper.createUserTable();

      //select all users
      System.out.println(mapper.selectAllUser());

      User user1 = new User(1, "zhangsan", 1.8, 100,
          new Timestamp(System.currentTimeMillis()),
          Date.valueOf("1995-03-02"),
          "hello".getBytes(StandardCharsets.UTF_8));
      User user2 = new User(2, "lisi", 1.7, 90,
          new Timestamp(System.currentTimeMillis()),
          Date.valueOf("1996-08-02"),
          "world".getBytes(StandardCharsets.UTF_8));

      //insert user1 and user2
      mapper.upsertUser(user1);
      mapper.upsertUser(user2);

      //select all users
      System.out.println(mapper.selectAllUser());
      //select user1
      System.out.println(mapper.selectOneUser(1));

      //delete user1
      mapper.deleteUser(1);
      System.out.println(mapper.selectAllUser());

      //update user2's score to 99
      user2.setScore(99);
      mapper.upsertUser(user2);
      System.out.println(mapper.selectAllUser());

      //drop user table
      mapper.dropUserTable();
    }
  }
}

完整示例

完整示例代碼，請參見mybatis-demo.tar。

執(zhí)行成功后，將返回以下結(jié)果：

[User{userId=1, userName='zhangsan', height=1.8, score=100, createTime=2023-12-02 09:39:17.63, birthday=1995-03-02, digest=hello}, User{userId=2, userName='lisi', height=1.7, score=90, createTime=2023-12-02 09:39:17.63, birthday=1996-08-02, digest=world}]
User{userId=1, userName='zhangsan', height=1.8, score=100, createTime=2023-12-02 09:39:17.63, birthday=1995-03-02, digest=hello}
[User{userId=2, userName='lisi', height=1.7, score=90, createTime=2023-12-02 09:39:17.63, birthday=1996-08-02, digest=world}]
[User{userId=2, userName='lisi', height=1.7, score=99, createTime=2023-12-02 09:39:17.63, birthday=1996-08-02, digest=world}]