README.md

MyBatis(Plus) Extensions

<dependency>
  <groupId>org.openingo.boot</groupId>
  <artifactId>mybatis-x</artifactId>
  <version>new_version</version>
</dependency>

features

• ModelX: 针对MyBatis-Plus的Model扩展

使用方式

• generator配置

// 策略配置
StrategyConfig strategy = new StrategyConfig();
strategy.setNaming(NamingStrategy.underline_to_camel);
strategy.setColumnNaming(NamingStrategy.underline_to_camel);
strategy.setSuperEntityClass(ModelX.class); // ModelX在这里

示例

以UserDO举例

@TableName("t_user")
public UserDO extends ModelX<UserDO> {
  private static final long serialVersionUID=1L;
  
  @TableId(value = "user_id", type = IdType.AUTO)
  private Integer userId;
  
  private String userName;
  
  private Integer sex;
}

• doQuery

  // sql: select user_id, user_name from t_user where user_name = 'qicz';
  UserDO.dao(UserDO.class).eq(UserDO::getUserName, "qicz").eq(UserDO::getSex: 1).select(UserDO::getUserId, UserDO::getUserName).doQuery();

  select输出的位置不限

• doQueryLimitOne

  // sql: select user_id, user_name from t_user where user_name = 'qicz' limit 1;
  UserDO.dao(UserDO.class).eq(UserDO::getUserName, "qicz").eq(UserDO::getSex: 1).select(UserDO::getUserId, UserDO::getUserName).doQueryLimitOne();

  【暂仅支持MySQL】会自动在queryWrapper拼接LIMIT 1，不影响添加LIMIT 1之后的其他操作(MyBatis-Plus只能进行一次last操作的问题解决)。

• doQueryOne

  // sql: select user_id, user_name from t_user where user_name = 'qicz';
  UserDO.dao(UserDO.class).eq(UserDO::getUserName, "qicz").eq(UserDO::getSex: 1).select(UserDO::getUserId, UserDO::getUserName).doQueryOne();

  当查询结果大于1条时，会有异常。

• doUpdate

  // sql: update t_user set user_name = 'qicz-new-name' where user_name = 'qicz' and sex = 1;
  UserDO.dao(UserDO.class).eq(UserDO::getUserName, "qicz").eq(UserDO::getSex: 1).set(UserDO::getUserName, "qicz-new-name").doUpdate();

• doDelete

  // sql: delete from t_user where user_name = 'qicz' and sex = 1;
  UserDO.dao(UserDO.class).eq(UserDO::getUserName, "qicz").eq(UserDO::getSex: 1).doDelete();

• 先doQuery再doUpdate或doDelete

  // do query
  // sql: select user_id, user_name from t_user where user_name = 'qicz';
  UserDO userDO = UserDO.dao(UserDO.class).eq(UserDO::getUserName, "qicz").select(UserDO::getUserId, UserDO::getUserName).doQuery();
  
  // do delete
  // sql: delete from t_user where user_name = 'qicz' and sex = 1;
  userDO.eq(UserDO::getSex: 1).doDelete();
  
  // do update
  // sql: update t_user set user_name = 'qicz-new-name' where user_name = 'qicz' and sex = 1;
  userDO.set(UserDO::getUserName, "qicz-new-name").doUpdate();

• by

  // sql: select user_id, user_name from t_user where user_name = 'qicz' and sex = 1;
  UserDO userDO = UserDO.dao(UserDO.class);
  userDO.setUserName("qicz");
  userDO.setSex(1);
  userDO.by(userDO).select(UserDO::getUserId, UserDO::getUserName).doQuery();