MyBatis入门（三）---多个参数

来源：互联网发布：c语言入门编程编辑：程序博客网时间：2024/05/29 14:37

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 authorWHERE 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 authorWHERE 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 authorWHERE 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 authorWHERE 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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