@RestController//控制器的方法
public class Controller {@Autowiredprivate IpostNewsImpl ipostNews;@ResponseBody@RequestMapping("/post")public Object post(HttpSession session,Integer currentPage, Integer pageSize){currentPage = currentPage == null || currentPage<= 0 ? 1:currentPage;pageSize = pageSize == null || pageSize<= 0 ? 10:pageSize;//分页逻辑1~10页PageHelper.startPage(currentPage, pageSize);//启用分页方法PostsExample example = new PostsExample();//generator的example创建PostsExample.Criteria c = example.createCriteria();//类似Hibernate的创建方法c.andUserIdEqualTo(1);//设置查找idList<Posts> posts = ipostNews.selectByExample(example);//传入postreturn posts;//最终显示1~10条Post}
}

pom依赖

<!--分页插件--><dependency><groupId>com.github.pagehelper</groupId><artifactId>pagehelper-spring-boot-starter</artifactId><version>1.2.5</version></dependency><plugins><!--mybatis 代码自动生成插件--><plugin><groupId>org.mybatis.generator</groupId><artifactId>mybatis-generator-maven-plugin</artifactId><version>1.3.6</version><configuration><!--Generator配置文件的位置--><configurationFile>GeneratorMapper.xml</configurationFile><verbose>true</verbose><overwrite>true</overwrite></configuration></plugin><!--项目打包的插件--><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins>

分页插件yml配置

pagehelper:helperDialect: mysql/oraclereasonable: truesupportMethodsArguments: trueparams: count=countSqlreturnPageInfo: check

generator配置

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfigurationPUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN""http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration><!-- 指定连接数据库的 JDBC 驱动包所在位置，指定到你本机的完整路径 --><classPathEntry location=""/><!-- 配置 table 表信息内容体，targetRuntime 指定采用 MyBatis3 的版本 --><context id="tables" targetRuntime="MyBatis3"><plugin type="com.xxg.mybatis.plugins.MySQLLimitPlugin"></plugin><!-- 抑制生成注释，由于生成的注释都是英文的，可以不让它生成 --><commentGenerator><property name="suppressAllComments" value="true"/></commentGenerator><!-- 配置数据库连接信息 配置mysql驱动即"com.mysql.jdbc.Driver"--><jdbcConnection driverClass="oracle.jdbc.driver.OracleDriver"connectionURL=""userId=""password=""</jdbcConnection><!-- 生成 model 类，targetPackage 指定 model 类的包名， targetProject 指定生成的 model 放在 eclipse 的哪个工程下面--><javaModelGenerator targetPackage=""targetProject="src/main/java"><property name="enableSubPackages" value="false"/><property name="trimStrings" value="false"/></javaModelGenerator><!-- 生成 MyBatis 的 Mapper.xml 文件，targetPackage 指定 mapper.xml 文件的包名， targetProject 指定生成的 mapper.xml 放在 eclipse 的哪个工程下面 --><sqlMapGenerator targetPackage=""targetProject="src/main/java"><!--model所放置的包--><property name="enableSubPackages" value="false"/></sqlMapGenerator><!-- 生成 MyBatis 的 Mapper 接口类文件,targetPackage 指定 Mapper 接口类的包名， targetProject 指定生成的 Mapper 接口放在 eclipse 的哪个工程下面 --><javaClientGenerator type="XMLMAPPER"targetPackage="" targetProject="src/main/java"><property name="enableSubPackages" value="false"/></javaClientGenerator><!-- 数据库表名及对应的 Java 模型类名，selectByExampleQuerId重点true --><table tableName="V_HOME_POSTS" domainObjectName="Posts"enableCountByExample="false"enableUpdateByExample="false"enableDeleteByExample="false"enableSelectByExample="true"selectByExampleQueryId="true"/></context>
</generatorConfiguration>

generator的CRUD方法名称，可放入上放的table变true实现自动逆向。

countByExample
deleteByPrimaryKey
deleteByExample
insert
insertSelective
selectByPrimaryKey
selectByExample
selectByExampleWithBLOBs
updateByPrimaryKey（带有用于指定是否更新BLOB列的替代）
updateByPrimaryKeySelective（将仅更新参数类中的非null字段）
updateByExample（带有用于指定是否更新BLOB列的替代）
updateByExampleSelective（仅更新参数类中的非null字段）

selectByExample简单举例（from官方文档）

TestTableExample example = new TestTableExample();//创建所需要的的POJO查询类example.createCriteria().andField1EqualTo(5);//查询FieldId=5的情况

等价于下面的代码

 TestTableExample example = new TestTableExample();example.or().andField1EqualTo(5);

复杂查询

TestTableExample example = new TestTableExample();example.or().andField1EqualTo(5).andField2IsNull();example.or().andField3NotEqualTo(9).andField4IsNotNull();List<Integer> field5Values = new ArrayList<Integer>();field5Values.add(8);field5Values.add(11);field5Values.add(14);field5Values.add(22);example.or().andField5In(field5Values);example.or().andField6Between(3, 7);

等价于以下动态sql语句

where (field1 = 5 and field2 is null)or (field3 <> 9 and field4 is not null)or (field5 in (8, 11, 14, 22))or (field6 between 3 and 7)

Criteria类的内部类方法

The Criteria inner class includes andXXX methods for each field, and each standard SQL predicate including:IS NULL - meaning the related column must be NULL
IS NOT NULL - meaning the related column must not be NULL
= (equal) - meaning the related column must be equal to the value passed in on the method call
<> (not equal) - meaning the related column must not be equal to the value passed in on the method call
> (greater than) - meaning the related column must be greater than the value passed in on the method call
>= (greater than or equal) - meaning the related column must be greater than or equal to the value passed in on the method call
< (less than) - meaning the related column must be less than the value passed in on the method call
<= (less than or equal) - meaning the related column must be less than or equal to the value passed in on the method call
LIKE - meaning the related column must be "like" the value passed in on the method call. The code does not add the required '%', you must set that value yourself in the value you pass in on the method call.
NOT LIKE - meaning the related column must be "not like" the value passed in on the method call. The code does not add the required '%', you must set that value yourself in the value you pass in on the method call.
BETWEEN - meaning the related column must be "between" the two values passed in on the method call.
NOT BETWEEN - meaning the related column must be "not between" the two values passed in on the method call.
IN - meaning the related column must be one of the list of values passed in on the method call.
NOT IN - meaning the related column must not be one of the list of values passed in on the method call.