CustomerMapper.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">
<!-- namespace表示命名空间 -->
<mapper namespace="com.itheima.mapper.CustomerMapper">
<!--根据客户编号获取客户信息 -->
<select id="findbookById" parameterType="String"
resultType="com.itheima.po.Book">
select * from book where id = #{id}
</select>
<!--根据客户名模糊查询客户信息列表-->
<select id="findbookByName" parameterType="String"
resultType="com.itheima.po.Book">
<!-- select * from book where name like ‘%${value}%‘ -->
select * from book where name like ‘%${value}%‘
</select>
</mapper>
Book.java
package com.itheima.po;
public class Book {
private String id;
private String name;
private String author;
private Double price;
private String press;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public Double getPrice() {
return price;
}
public void setPrice(Double price) {
this.price = price;
}
public String getPress() {
return press;
}
public void setPress(String press) {
this.press = press;
}
public String toString() {
return "Book [id=" + id + ", name=" + name + ", author=" + author + ", price=" + price + ", press=" + press
+ "]";
}
}
MybatisTest.java
package com.itheima.test;
import java.io.InputStream;
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 org.junit.Test;
import java.util.List;
import com.itheima.po.Book;
public class MybatisTest {
@Test
public void findbookByIdTest() throws Exception {
String resource = "mybatis-config.xml";
InputStream inputStream =
Resources.getResourceAsStream(resource);
SqlSessionFactory sqlSessionFactory =
new SqlSessionFactoryBuilder().build(inputStream);
SqlSession sqlSession = sqlSessionFactory.openSession();
Book book = sqlSession.selectOne("com.itheima.mapper"+
".CustomerMapper.findbookById","42705");
System.out.println(book.toString());
sqlSession.close();
System.out.println();
}
@Test
public void findbookByNameTest() throws Exception {
String resource = "mybatis-config.xml";
InputStream inputStream = Resources.getResourceAsStream(resource);
SqlSessionFactory sqlSessionFactory =
new SqlSessionFactoryBuilder().build(inputStream);
SqlSession sqlSession = sqlSessionFactory.openSession();
List<Book> books = sqlSession.selectList("com.itheima.mapper"
+ ".CustomerMapper.findbookByName","s");
for (Book book : books) {
System.out.println(book);
}
sqlSession.close();
}
}
log4j.properties
# Global logging configuration
log4j.rootLogger=ERROR, stdout
# MyBatis logging configuration...
log4j.logger.com.itheima=DEBUG
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n
mybatis-config.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>
<!--1.配置环境 ，默认的环境id为mysql-->
<environments default="mysql">
<!--1.2.配置id为mysql的数据库环境 -->
<environment id="mysql">
<!-- 使用JDBC的事务管理 -->
<transactionManager type="JDBC" />
<!--数据库连接池 -->
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver" />
<property name="url"
value="jdbc:mysql://localhost:3306/bookdata" />
<property name="username" value="root" />
<property name="password" value="root" />
</dataSource>
</environment>
</environments>
<!--2.配置Mapper的位置 -->
<mappers>
<mapper resource="com/itheima/mapper/CustomerMapper.xml" />
</mappers>
</configuration>
截图：
原文：https://www.cnblogs.com/1314-520/p/12790582.html