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1.1.3
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README.md
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README.md
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# mybatis-plus-join
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* 支持连表查询的[mybatis-plus](https://gitee.com/baomidou/mybatis-plus)
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* 支持连表查询的[mybatis-plus](https://gitee.com/baomidou/mybatis-plus)
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* [演示示例](https://gitee.com/best_handsome/mybatis-plus-join-demo)
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@ -23,12 +23,12 @@ QQ群:1022221898
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<dependency>
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<groupId>com.github.yulichang</groupId>
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<artifactId>mybatis-plus-join</artifactId>
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<version>1.1.2</version>
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<version>1.1.3</version>
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</dependency>
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```
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或者clone代码到本地,执行mvn install,再引入以上依赖
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<br>
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注意: mybatis plus version >= 3.4.0
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注意: mybatis plus version >= 3.4.0
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<br><br>
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2. 添加配置文件
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@ -40,7 +40,7 @@ public class MybatisPlusConfig {
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* 启用连表拦截器
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*/
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@Bean
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public MybatisPlusInterceptor paginationInterceptor() {
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public MybatisPlusInterceptor mybatisPlusInterceptor() {
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MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
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//分页插件
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interceptor.addInnerInterceptor(new PaginationInnerInterceptor());
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@ -54,7 +54,7 @@ public class MybatisPlusConfig {
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* sql注入器
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*/
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@Bean
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public MPJSqlInjector mySqlInjector() {
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public MPJSqlInjector sqlInjector() {
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return new MPJSqlInjector();
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}
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}
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@ -78,25 +78,9 @@ public class MybatisPlusConfig {
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3. MPJBaseServiceImpl 继承了ServiceImpl,同样添加了以上方法
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## 核心类 MPJQueryWrapper,MPJLambdaQueryWrapper和MPJJoinLambdaQueryWrapper
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## 核心类 MPJQueryWrapper和MPJJoinLambdaQueryWrapper
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|-|MPJQueryWrapper|MPJLambdaQueryWrapper|MPJJoinLambdaQueryWrapper|
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|---|---|---|---|
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|select(String)|支持|<font color=red>**支持**|不支持|
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|select(lambda)|不支持|仅支持主表lambda|所有表lambda|
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|join(String)|支持|支持|不支持|
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|join(lambda)|不支持|不支持|支持|
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|条件String|支持|不支持|不支持|
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|条件lambda|不支持|仅支持主表lambda|所有表lambda|
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MPJQueryWrapper相当于mp的QueryWrapper
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MPJLambdaQueryWrapper相当于mp的LambdaQueryWrapper
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两者可以无缝切换
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MPJQueryWrapper.lambda() ===> MPJLambdaQueryWrapper
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MPJLambdaQueryWrapper.stringQuery() ===> MPJQueryWrapper
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## MPJJoinLambdaQueryWrapper用法
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### MPJJoinLambdaQueryWrapper用法
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#### MPJJoinLambdaQueryWrapper示例
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@ -116,9 +100,9 @@ class test {
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.select(AreaDO::getProvince, AreaDO::getCity)
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.leftJoin(UserAddressDO.class, UserAddressDO::getUserId, UserDO::getId)
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.leftJoin(AreaDO.class, AreaDO::getId, UserAddressDO::getAreaId)
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.eq(true, UserDO::getId, 1)
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.like(true, UserAddressDO::getTel, "1")
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.gt(true, UserDO::getId, 5));
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.eq(UserDO::getId, 1)
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.like(UserAddressDO::getTel, "1")
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.gt(UserDO::getId, 5));
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}
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}
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```
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@ -198,9 +182,9 @@ FROM
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LIMIT ?,?
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```
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## MPJQueryWrapper和MPJLambdaQueryWrapper
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### MPJQueryWrapper
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### 简单的3表查询
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#### 简单的3表查询
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```java
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class test {
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@ -209,16 +193,13 @@ class test {
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void testJoin() {
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List<UserDTO> list = userMapper.selectJoinList(UserDTO.class,
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new MPJLambdaQueryWrapper<UserDO>()
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new MPJQueryWrapper<UserDO>()
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.selectAll(UserDO.class)
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.select("addr.tel", "addr.address", "a.province")
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.leftJoin("user_address addr on t.id = addr.user_id")
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.rightJoin("area a on addr.area_id = a.id")
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.gt(true, UserDO::getId, 1)
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.eq(true, UserDO::getSex, "男")
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.stringQuery()
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.like(true, "addr.tel", "1")
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.le(true, "a.province", "1"));
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.like("addr.tel", "1")
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.le("a.province", "1"));
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}
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}
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```
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@ -239,21 +220,17 @@ FROM
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LEFT JOIN user_address addr on t.id = addr.user_id
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RIGHT JOIN area a on addr.area_id = a.id
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WHERE (
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t.id > ?
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AND t.sex = ?
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AND addr.tel LIKE ?
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addr.tel LIKE ?
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AND a.province <= ?)
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```
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说明:
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* UserDTO.class 查询结果类(resultType)
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* selectAll(UserDO.class) 查询主表全部字段(主表实体类)
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* selectAll(UserDO.class) 查询主表全部字段(主表实体类)默认主表别名 "t"
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* select() mp的select策略是覆盖,以最后一次为准,这里的策略是追加,可以一直select
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主表字段可以用lambda,会自动添加表别名,主表别名默认是 t ,非主表字段必须带别名查询
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* leftJoin() rightJoin() innerJoin() 传sql片段 格式 (表 + 别名 + 关联条件)
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* stringQuery() lambda查询转string查询
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* lambda() string查询转lambda查询
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* 条件查询,可以查询主表以及参与连接的所有表的字段,全部调用mp原生的方法,正常使用没有sql注入风险
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### 分页查询
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@ -312,10 +289,8 @@ class test {
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//自定义数据集
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.leftJoin("(select * from user_address) addr on t.id = addr.user_id")
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.rightJoin("area a on addr.area_id = a.id")
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.eq(true, UserDO::getId, 1)
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.stringQuery()
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.like(true, "addr.tel", "1")
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.le(true, "a.province", "1")
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.like("addr.tel", "1")
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.le("a.province", "1")
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.orderByDesc("addr.id"));
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}
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}
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LEFT JOIN (select * from user_address) addr on t.id = addr.user_id
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RIGHT JOIN area a on addr.area_id = a.id
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WHERE (
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t.id = ?
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AND addr.tel LIKE ?
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addr.tel LIKE ?
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AND a.province <= ?)
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ORDER BY
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addr.id DESC
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2
pom.xml
2
pom.xml
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.github.yulichang</groupId>
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<artifactId>mybatis-plus-join</artifactId>
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<version>1.1.2</version>
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<version>1.1.3</version>
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<name>mybatis-plus-join</name>
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<description>An enhanced toolkit of Mybatis-Plus to simplify development.</description>
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<url>https://github.com/yulichang/mybatis-plus-join</url>
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