MyBatis入门（三）---多个参数

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','[email protected]','张三是个新手，刚开始注册','2015-10-29 10:23:59'),(2,'李四','123asf','[email protected]','魂牵梦萦 ','2015-10-29 10:24:29'),(3,'王五','dfsd342','[email protected]','康熙王朝','2015-10-29 10:25:23'),(4,'赵六','123098sdfa','[email protected]','花午骨','2015-10-29 10:26:09'),(5,'钱七','zxasqw','[email protected]','这家伙很赖，什么也没留下','2015-10-29 10:27:04'),(6,'张三丰','123456','[email protected]','这家伙很赖，什么也没留下','2015-10-29 11:48:00'),(7,'金庸','qwertyuiop','[email protected]','这家伙很赖，什么也没留下','2015-10-29 11:48:24'),(8,'知道了','456789','[email protected]','哈哈哈哈哈雅虎','2015-10-29 14:03:27'),(9,'不知道','1234567890','[email protected]','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>