mybaits----参数的处理----笔记

目录结构
mybaits----参数的处理----笔记

mybaits的xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
  PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
  "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

  <properties resource="db.properties"></properties>

  <environments default="development">
    <environment id="development">
      <transactionManager type="JDBC"/>
      <dataSource type="POOLED">
        <property name="driver" value="${mysql.driver}"/>
        <property name="url" value="${mysql.url}"/>
        <property name="username" value="${mysql.username}"/>
      </dataSource>
    </environment>
  </environments>
  
   <databaseIdProvider type="DB_VENDOR">
   <property name="MySQL" value="mysql"/>
   </databaseIdProvider>
  
  
  <mappers>
    <mapper resource="sqlMapper.xml"/>
  </mappers>
  

</configuration>

sqlMapper的xml

<?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="top.demo.inter.TestSqlInterface">

<!-- #{} 和 ${} 占位参数  #预编译形式，$直接拼sql  -->

<!-- 
1.当只有一个参数时  且该参数类型 不是Collection的实现类 如list set等 
，那么框架不会封装参数成map 否则参数最终都封装成map
2.当接口的参数没有使用param注解，那么 映射xml取参默认的key为param1...paramN N代表该参数在接口中的位置，
如果使用了注解用注解表名的参数名即可
3.可以直接使用bean当作参数，xml取参用该bean的属性即可
4.当没有bean 为了方便  接口的参数可以直接使用Map  key为占位参数的名字  value为参数值

5.关于返回主键 使用useGeneratedKeys="true" keyProperty="id"   ，keyProperty指定了获取主键保存在哪个属性里

 -->
 
  <select id="getOne" resultType="top.demo.bean.Customer" databaseId="mysql">
    select id,name,address as home,phone from customers where id = #{id}
  </select>
  
  <update id="updateInfo" databaseId="mysql">
  	update customers set name=#{param2},address=#{home} 
  	where id=#{id}
  </update>
  
  <delete id="deleteOne" databaseId="mysql" >
    	delete from customers where id=#{id}
  </delete>
  
  
  <insert id="insert" useGeneratedKeys="true" keyProperty="id" databaseId="mysql">
  	insert into customers (name,address) value(#{name},#{home})
  </insert>
  
  
  <select id="getSize" resultType="int" databaseId="mysql">
  	select count(id)  from customers
  </select>
  
</mapper>

数据库配置文件

mysql.driver=com.mysql.jdbc.Driver
mysql.url=jdbc:mysql://localhost:3306/testpro
mysql.username=root

Dao接口

package top.demo.inter;

import java.util.Collection;
import java.util.Map;

import org.apache.ibatis.annotations.Param;

import top.demo.bean.Customer;

public interface TestSqlInterface {

		public Customer getOne(int id);
		public int updateInfo(@Param("id") int id,String name,@Param("home")String home);
		public boolean deleteOne(Map<String, Object>map);
		public boolean insert(Customer customer);
		public int getSize();

}

测试入口

package top.demo.test;

import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;
import java.util.Map.Entry;

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 com.mysql.jdbc.DatabaseMetaData;

import top.demo.bean.Customer;
import top.demo.inter.TestSqlInterface;

public class Test {

	public static void main(String argv[]) throws IOException
	{
		String resource = "mybatisconfig.xml";
		InputStream inputStream = Resources.getResourceAsStream(resource);
		SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
		
		System.out.println(sqlSessionFactory);
		//构造参数传入true为开启自动提交  如果为false需要在之后手动commit
		SqlSession session=sqlSessionFactory.openSession(true);
		TestSqlInterface testDao = (TestSqlInterface) session.getMapper(TestSqlInterface.class);
		System.out.println(testDao.getOne(1));
		//testDao.updateInfo(1, "你好2222", "中国");
		//System.out.println(testDao.getOne(1));
		System.out.println(testDao.getSize());
		
		
		/*
		 * 接口参数直接用bean xml里用bean的属性
		 * */
		
		/*Customer customer=new Customer("这是测试的111","火星");
		boolean res=testDao.insert(customer);
		System.out.println(res);
		System.out.println(customer.getId());
		
		System.out.println(testDao.getOne(customer.getId()));*/
		
		
		/*
		 * 测试map作为接口的参数  且 映射xml里直接用map的key获取value
		 * */
		
		/*Map<String, Object> map=new HashMap<>();
		map.put("id", 10);
		
		System.out.println(testDao.deleteOne(map));*/
		
		session.close();
	}
	
}

用到的bean

package top.demo.bean;

public class Customer {
	
	private int id;
	private String name;
	private String home; //address
	private String phone;
	public int getId() {
		return id;
	}
	@Override
	public String toString() {
		return "Customer [id=" + id + ", name=" + name + ", home=" + home + ", phone=" + phone + "]";
	}
	public void setId(int id) {
		this.id = id;
		
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getHome() {
		return home;
	}
	public void setHome(String home) {
		this.home = home;
	}
	public String getPhone() {
		return phone;
	}
	public void setPhone(String phone) {
		this.phone = phone;
	}
	public Customer() {
		super();
	}
	public Customer(String name, String home) {
		super();
		this.name = name;
		this.home = home;
	}

	
	
}

mybaits----参数的处理----笔记

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