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','','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','','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@qq.com','哈哈哈哈哈雅虎','2015-10-29 14:03:27'),(9,'不知道','','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>