mybatis-210721-02—动态sql-trim自定义字符串截取
EmployeeMapper.java
package com.bgy.mybatis.dao;
import java.util.List;
import com.bgy.mybatis.bean.Employee;
public interface EmployeeMapper {
public List<Employee> getEmpsByConditionTrim(Employee employee);
}
EmployeeMapper.xml(笔记在这儿哦)
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.bgy.mybatis.dao.EmployeeMapper">
<select id="getEmpsByConditionTrim" resultType="com.bgy.mybatis.bean.Employee">
select
*
from
tbl_employee
<trim prefix="where" suffixOverrides="and">
<if test="id!=null and id!=''">
id=#{id} and
</if>
<if test="lastName!=null and lastName!=""">
last_name like #{lastName} and
</if>
<if test="email!=null and email.trim()!=""">
email like #{email} and
</if>
<if test="gender==0 or gender==1">
gender=#{gender}
</if>
</trim>
</select>
</mapper>
MybatisTest.java
package com.bgy.mybatis.test;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
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 org.junit.jupiter.api.Test;
import com.bgy.mybatis.bean.Department;
import com.bgy.mybatis.bean.Employee;
import com.bgy.mybatis.dao.DepartmentMapper;
import com.bgy.mybatis.dao.EmployeeMapper;
class MybatisTest {
public SqlSessionFactory getSqlSessionFactory() throws IOException {
String resource = "mybatis-config.xml";
InputStream inputStream = Resources.getResourceAsStream(resource);
return new SqlSessionFactoryBuilder().build(inputStream);
}
@Test
public void test() throws IOException{
SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();
SqlSession sqlSession = sqlSessionFactory.openSession();
try {
EmployeeMapper mapper = sqlSession.getMapper(EmployeeMapper.class);
Employee employee = new Employee(null,"","","1");
List<Employee> emps = mapper.getEmpsByConditionTrim(employee);
System.out.println(emps);
} finally {
sqlSession.close();
}
}
}