0063 MyBatis入门示例

<dependencies>
<dependency>
<groupId>mysql</groupId>   <!-- mysql数据库驱动 -->
<artifactId>mysql-connector-java</artifactId>
<version>5.1.38</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>   <!-- MyBatis框架 -->
<artifactId>mybatis</artifactId>
<version>3.4.1</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
</dependency>
<dependency>
<groupId>log4j</groupId>            <!-- 这是日志框架 -->
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
</dependencies>

DROP DATABASE IF EXISTS `books`;
CREATE DATABASE `books` ;
USE `books`;
DROP TABLE IF EXISTS `book`;
CREATE TABLE `book` (
`id` INT PRIMARY KEY AUTO_INCREMENT,
`name` VARCHAR(128),
`press` VARCHAR(12),
`author` VARCHAR(24),
`isbn` VARCHAR(13),
`douban` FLOAT
);

INSERT INTO `book` (`name`,`press`,`author`,`isbn`,`douban`) VALUES('Effective Java 中文版','机械工业出版社','（美）布洛克（Bloch J.）著；杨春花，俞黎敏译','9787111255833','9.1');
INSERT INTO `book` (`name`,`press`,`author`,`isbn`,`douban`) VALUES('Java并发编程实践','电子工业出版社','（（美）Brian Goetz等著；韩锴，方妙译','9787121043161','8.8');
INSERT INTO `book` (`name`,`press`,`author`,`isbn`,`douban`) VALUES('Java网络编程 第4版','中国电力出版社','（美）哈诺德著','9787512361881','7.4');

package net.sonng.mbt.entity;

public class Book {
private int id;
private String name;
private String press;
private String author;
private String isbn;
private float douban;
//。。。。。
}

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//ibatis.apache.org//DTDMapper 3.0//EN" "http://ibatis.apache.org/dtd/ibatis-3-mapper.dtd">
<mapper namespace="net.sonng.mbt.mapper.BookMapper">
<!-- namespace是命名空间，应当作为字符串看待，相当于这个xml文档的名称，命名一般是包名+sql映射文件名 -->
<insert id="save" parameterType="net.sonng.mbt.entity.Book" useGeneratedKeys="true" >
INSERT INTO book(`name`,`press`,`author`,`isbn`,`douban`) VALUES(#{name},#{press},#{author},#{isbn},#{douban})
</insert>
<!-- insert元素表明这是个插入语句，另外还有select、update、delete等等 -->
<!-- id属性加上命名空间，就是这条sql的唯一标识符，测试类session.insert()语句通过这个唯一标识符调用这条sql -->
<!-- parameterType属性，是sql语句的参数类型 -->
<!-- useGeneratedKeys属性表示使用数据库的自动增长策略，当然数据库一般都是支持的，这里没这个属性也没问题 -->
<!-- #{User类的属性名}：这个表示传进来一个User对象，获取其对应的属性值作为sql语句参数值 -->
</mapper>

<?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>
<settings>
<setting name="logImpl" value="LOG4J" />
</settings>
<environments default="mysql">
<!-- 下面可以配置多个environment，即多个多个数据库，但只能选择一个数据库，就是这里的default属性指定的environment的id -->
<environment id="mysql">
<transactionManager type="JDBC" /> <!-- MyBatis自带的事务管理 -->
<dataSource type="POOLED" > <!-- 使用MyBatis自带的连接池管理 -->
<property name="driver" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://127.0.0.1:3306/books?useSSL=false&useUnicode=true&charsetEncoding=utf8" />
<property name="username" value="kumi" />
<property name="password" value="1234" />
</dataSource>
</environment>
</environments>
<mappers>  <!-- 下面指定sql映射文件，可以指定多个 -->
<mapper resource="net/sonng/mbt/mapper/BookMapper.xml" /> <!-- 指定BookMapper.xml -->
</mappers>
</configuration>

log4j.rootLogger=ERROR, stdout
log4j.logger.net.sonng.mbt.mapper.BookMapper=DEBUG
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

package net.sonng.mbt.test;

import java.io.IOException;
import java.io.InputStream;

import net.sonng.mbt.entity.Book;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

public class BookTest {
public static void main(String[] args) throws IOException{
InputStream inputStream=Resources.getResourceAsStream("mybatis-config.xml");
SqlSessionFactory sqlSessionFactory=new SqlSessionFactoryBuilder().build(inputStream);
SqlSession session=sqlSessionFactory.openSession();
//用mybatis-config.xml和SqlSessionFactoryBuilder获取SqlSessionFactory，再获得session
Book book=new Book();
book.setName("深入理解Java 7 核心技术与最佳实践");
book.setPress("机械工业出版社");
book.setAuthor("成富著");
book.setDouban(6.9f);
book.setIsbn("9787111380399");
session.insert("net.sonng.mbt.mapper.BookMapper.save",book);  //调用BookMapper.xml中的sql语句插入book对象
session.commit();                                             //提交事务
session.close();                                              //关闭session
}
}

name

press

author

isbn

douban

小结