MyBatis入门（三）---多个参数

一、建立表

1.1、建立表，并插入数据

/*SQLyog EnterPRise v12.09 (64 bit)MySQL - 5.6.27-log : Database - mybatis
**********************************************************************//*!40101 SET NAMES utf8 */;/*!40101 SET SQL_MODE=''*/;/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;CREATE DATABASE /*!32312 IF NOT EXISTS*/`mybatis` /*!40100 DEFAULT CHARACTER SET utf8 */;USE `mybatis`;/*Table structure for table `author` */DROP TABLE IF EXISTS `author`;CREATE TABLE `author` (
`author_id` int(11) unsigned NOT NULL AUTO_INCREMENT COMMENT '作者ID主键',
`author_username` varchar(30) NOT NULL COMMENT '作者用户名',
`author_passWord` varchar(32) NOT NULL COMMENT '作者密码',
`author_email` varchar(50) NOT NULL COMMENT '作者邮箱',
`author_bio` varchar(1000) DEFAULT '这家伙很赖，什么也没留下' COMMENT '作者简介',
`register_time` datetime DEFAULT CURRENT_TIMESTAMP COMMENT '注册时间', PRIMARY KEY (`author_id`)
) ENGINE=InnoDB AUTO_INCREMENT=10 DEFAULT CHARSET=utf8;/*Data for the table `author` */insert into `author`(`author_id`,`author_username`,`author_password`,`author_email`,`author_bio`,`register_time`)
values (1,'张三','123456','123@QQ.com','张三是个新手，刚开始注册','2015-10-29 10:23:59'),(2,'李四','123asf','lisi@163.com','魂牵梦萦 ','2015-10-29 10:24:29'),(3,'王五','dfsd342','ww@sina.com','康熙王朝','2015-10-29 10:25:23'),(4,'赵六','123098sdfa','zhaoliu@qq.com','花午骨','2015-10-29 10:26:09'),(5,'钱七','zxasqw','qianqi@qq.com','这家伙很赖，什么也没留下','2015-10-29 10:27:04'),(6,'张三丰','123456','zhangsf@qq.com','这家伙很赖，什么也没留下','2015-10-29 11:48:00'),(7,'金庸','qwertyuiop','wuji@163.com','这家伙很赖，什么也没留下','2015-10-29 11:48:24'),(8,'知道了','456789','456789@qq.com','哈哈哈哈哈雅虎','2015-10-29 14:03:27'),(9,'不知道','1234567890','123456@qq.com','哈哈哈哈哈雅虎','2015-10-29 14:01:16');/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;

二、创建项目

2.1、创建项目

2.2、创建POJO类

package com.pb.mybatis.po;import java.util.Date;/**
*

* @Title: Author.java

* @Package com.pb.mybatis.po

* @ClassName Author

* @Description: TODO(Blog作者类)

* @author 刘楠

* @date 2015-10-29 上午9:27:53

* @version V1.0 */public class Author { //作者ID
private int authorId;
//作者用户名
private String authorUserName;
//作者密码
private String authorPassword;
//作者邮箱
private String authorEmail;
//作者介绍
private int authorBio;
//注册时间
private Date registerTime; /**
* @return the authorId */
public int getAuthorId() { return authorId;
} /**
* @param authorId the authorId to set */
public void setAuthorId(int authorId) { this.authorId = authorId;
} /**
* @return the authorUserName */
public String getAuthorUserName() { return authorUserName;
} /**
* @param authorUserName the authorUserName to set */
public void setAuthorUserName(String authorUserName) { this.authorUserName = authorUserName;
} /**
* @return the authorPassword */
public String getAuthorPassword() { return authorPassword;
} /**
* @param authorPassword the authorPassword to set */
public void setAuthorPassword(String authorPassword) { this.authorPassword = authorPassword;
} /**
* @return the authorEmail */
public String getAuthorEmail() { return authorEmail;
} /**
* @param authorEmail the authorEmail to set */
public void setAuthorEmail(String authorEmail) { this.authorEmail = authorEmail;
} /**
* @return the authorBio */
public int getAuthorBio() { return authorBio;
} /**
* @param authorBio the authorBio to set */
public void setAuthorBio(int authorBio) { this.authorBio = authorBio;
} /**
* @return the registerTime */
public Date getRegisterTime() { return registerTime;
} /**
* @param registerTime the registerTime to set */
public void setRegisterTime(Date registerTime) { this.registerTime = registerTime;
} /** (non Javadoc)

* <p>Title: toString</p>

* <p>Description:重写toString方法 </p>

* @return

* @see java.lang.Object#toString() */
@Override public String toString() { return "Author [authorId=" + authorId + ", authorUserName="
+ authorUserName + ", authorPassword=" + authorPassword + ", authorEmail=" + authorEmail + ", authorBio=" + authorBio + ", registerTime=" + registerTime + "]";
}




}

2.3、创建configruation

<?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" />
<typeAliases>
<!--使用默认别名 -->
<package name="com.pb.mybatis.po"/>
</typeAliases>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="${jdbc.driver}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</dataSource>
</environment>
</environments>
<mappers>
<!-- 加载映射 -->

<package name="com.pb.mybatis.mapper"/>
</mappers>
</configuration>

2.3、创建mapper接口

public interface AuthorMapper {
/**
*
* @Title: findById

* @Description: TODO(根据查找一个用户)

* @param id
* @return Author */
public Author findAuthorById(int authorId);

}

2.4、创建mapper.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="com.pb.mybatis.mapper.AuthorMapper"><!--使用resultMap映射 type使用别名，--><resultMap type="Author" id="authorResultMap"><!--主键 --><id property="authorId" column="author_id"/><!--普通属性与表中的字段对应 --><result property="authorUserName" column="author_username"/><result property="authorPassword" column="author_password"/><result property="authorEmail" column="author_email"/><result property="authorBio" column="author_bio"/><result property="registerTime" column="register_time"/></resultMap><!--根据查找一个用户 --><select id="findAuthorById" parameterType="int" resultMap="authorResultMap">SELECT * FROM author
WHERE author_id=#{authorId}</select></mapper>

三、传入多个ID，进行查找使用List

3.1、更改Mapper接口

/**
*
* @Title: findAuthors

* @Description: TODO(根据多个ID进行查找)

* @param idLists
* @return List<Author> */
public List<Author> findAuthors(List<Integer> idLists);

3.2、更改Mapper.xml

<!--根据多个ID查找 --><select id="findAuthors" resultMap="authorResultMap">SELECT * FROM author
WHERE author_id in<foreach collection="list" item="item" index="index" open="(" close=")" separator=",">#{item}</foreach>

<!-- collection:传入参数的名称 index:索引： item:collection的别名 --></select>

3.3、测试

@Test public void testFindAuthors() { //获取会话
Sqlsession sqlSession=sqlSessionFactory.openSession(); //Mapper接口
AuthorMapper authorMapper=sqlSession.getMapper(AuthorMapper.class);
List<Integer> list=new ArrayList<Integer>();

list.add(1);
list.add(3);
list.add(4);
list.add(6);
list.add(7); //调用方法
List<Author> authors=authorMapper.findAuthors(list);
System.out.println(authors); //关闭会话 sqlSession.close();
}

四、使用Map做为参数

4.1、在Mapper接口中增加相应方法

/**
*
* @Title: findAuthorsByMap

* @Description: TODO(使用Map做为参数)

* @param map
* @return List<Author> */
public List<Author> findAuthorsByMap(Map<String, Object> map);

4.2、更改Mapper.xml

<!--使用Map查找 --><select id="findAuthorsByMap" resultMap="authorResultMap">SELECT * FROM author<!-- 参数使用Map的Key-->WHERE author_username LIKE "%"#{username}"%"
or author_bio like"%"#{bio}"%"</select>

4.3、测试

@Test public void testFindAuthorsByMap() { //获取会话
SqlSession sqlSession=sqlSessionFactory.openSession(); //Mapper接口
AuthorMapper authorMapper=sqlSession.getMapper(AuthorMapper.class);
Map<String, Object> map=new HashMap<String, Object>();
map.put("username", "张");
map.put("bio", "哈");
//调用方法
List<Author> authors=authorMapper.findAuthorsByMap(map);
System.out.println(authors); //关闭会话 sqlSession.close(); for(Author a:authors){
System.out.println(a.toString());
}
}

五、直接使用多个参数

5.1、Mapper接口

/**
*
* @Title: findAuthorsByParams

* @Description: TODO(使用多个参数

* @param id
* @param username
* @return List<Author> */
public List<Author> findAuthorsByParams(int authorId,String authorUserName);

5.2、Mapper.xml

<!--直接使用多个参数 --><select id="findAuthorsByParams" resultMap="authorResultMap">SELECT * FROM author
WHERE author_id=#{0}
OR author_username LIKE "%"#{1}"%"<!-- 其中，#{0}代表接收的是dao层中的第一个参数，#{1}代表dao层中第二参数，更多参数一致往后加即可。 --></select>

5.3、测试

@Test public void testFindAuthorsByParams() { //获取会话
SqlSession sqlSession=sqlSessionFactory.openSession(); //Mapper接口
AuthorMapper authorMapper=sqlSession.getMapper(AuthorMapper.class);

//调用方法
List<Author> authors=authorMapper.findAuthorsByParams(6,"张");
System.out.println(authors); //关闭会话 sqlSession.close(); for(Author a:authors){
System.out.println(a.toString());
}
}

六、直接使用多个参数注解写法

6.1、Mapper接口

public List<Author> findAuthorsByParams(@Param("id") int authorId,@Param("username")String authorUserName);

6.2、Mapper.xml

<!--使用注解的方式使用多个参数 --><select id="findAuthorsByParams" resultMap="authorResultMap">SELECT * FROM author
WHERE author_id=#{id}
or author_username LIKE "%"#{username}"%"<!-- 使用注解的方式。，直接使用Param中的参数即可 --></select>

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