六、输入参数（parameterType）

1.类型为简单类型（8个基本类型+String）

#{}、${}的区别

区别1

#{任意值}
${value} ，其中的标识符只能是value

<select id="queryStudentByStuname" parameterType="string" resultMap="studentResult">
	
	select * from student where stuname = '${value}'
select>

区别2

#{}自动给String类型加上’ ’ （自动类型转换）
${}原样输出，但是适合于动态排序（动态字段）

<select id="queryStudentOrderByColumn" parameterType="string" resultMap="studentResult">
	select * from student order by ${value} desc
select>

区别3

#{}防止SQL注入
${}不能防止SQL注入

2.对象类型

#{属性名}
${属性名}

 
<mapper namespace="nuc.hzb.mapper.studentMapper">

	<select id="queryStudentByAddress" parameterType="address" resultType="student">
		select * from student where homeaddress = #{homeAddress} or schooladdress like '${schoolAddress}' 
 	select>
	
	<select id="queryStudentByAddress1" parameterType="student" resultType="student">
		select * from student where homeaddress = #{address.homeAddress} or schooladdress like '${address.schoolAddress}' 
 	select>
 	
 	<select id="queryStudentByStuAgeOrStuNameWithHashMap" parameterType="hashmap" resultType="student">
		select * from student where stuage = #{stuAge} or stuname like '%${stuName}%'
 	select>
	
mapper>

package nuc.hzb.mapper;

import java.util.List;
import java.util.Map;

import nuc.hzb.entity.Address;
import nuc.hzb.entity.Student;

public interface studentMapper {

	List<Student> queryStudentByAddress(Address address);
	List<Student> queryStudentByAddress1(Student student);
	List<Student> queryStudentByStuAgeOrStuNameWithHashMap(Map<String, Object> map);
	
}

package nuc.hzb.test;

import java.io.IOException;
import java.io.Reader;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

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 nuc.hzb.entity.Address;
import nuc.hzb.entity.Student;
import nuc.hzb.mapper.studentMapper;

public class TestMyBatis {

		
	public static void queryStudentByAddress() throws IOException {
		Reader reader = Resources.getResourceAsReader("conf.xml");
		SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(reader);
		SqlSession session = sessionFactory.openSession();
		studentMapper studentmapper = session.getMapper(studentMapper.class);
		Address address = new Address();
		address.setHomeAddress("HH");
		address.setSchoolAddress("%Z%");
		List<Student> students = studentmapper.queryStudentByAddress(address);
		System.out.println(students);
		session.close();
	}
	
	public static void queryStudentByAddress1() throws IOException {
		Reader reader = Resources.getResourceAsReader("conf.xml");
		SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(reader);
		SqlSession session = sessionFactory.openSession();
		studentMapper studentmapper = session.getMapper(studentMapper.class);
		Address address = new Address();
		address.setHomeAddress("HH");
		address.setSchoolAddress("%Z%");
		Student student = new Student();
		student.setAddress(address);
		List<Student> students = studentmapper.queryStudentByAddress1(student);
		System.out.println(students);
		session.close();
	}
	
	public static void queryStudentByStuAgeOrStuNameWithHashMap() throws IOException {
		Reader reader = Resources.getResourceAsReader("conf.xml");
		SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(reader);
		SqlSession session = sessionFactory.openSession();
		studentMapper studentmapper = session.getMapper(studentMapper.class);	
		Map<String, Object> studenMap = new HashMap<String, Object>();
		studenMap.put("stuAge", 18);
		studenMap.put("stuName", "hzb");
		List<Student> students = studentmapper.queryStudentByStuAgeOrStuNameWithHashMap(studenMap);
		System.out.println(students);
		session.close();
	}
	
	public static void main(String args[]) throws IOException {
		queryStudentByAddress();
		queryStudentByAddress1();
		queryStudentByStuAgeOrStuNameWithHashMap();
	}
}