有好一段时间没有学习新东西了，过了个十月一感觉事情还是越早做越好，废话不多说了，说一下用mybatis连接MySQL数据库，上一篇写了jdbc测试，我的数据库表还是原来的。由于从网上查的资料大部分都是eclipse，由于我是做Android开发的，习惯了ide，所以就硬着头皮来了，中间其实遇到过好多问题。

看一下工程结构

先说一下Java代码，dao是查询接口，model是ben和对应的查询语句的xml，我感觉这样有点不好，user.xml放在dao里面比较好，等理解了就知道了，由于我是初学者所以好多东西都不是很理解，后期会给出合理的包的定义

test是我做测试用的

再说一下resources，configuration是配置文件，log4j是日志打印，其他的暂时用不到。

好来看一下代码，我按照建文件的顺序给大家来，

首先需要有一个对象，对象根据数据库建

user.java

package com.fanyafeng.model; import java.util.Date; /** * Author： fanyafeng * Data： 16/10/11 14:56 * Email: fanyafeng@live.cn */ public class User { private int id; private String username; private Date birthday; private String sex; private String address; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public Date getBirthday() { return birthday; } public void setBirthday(Date birthday) { this.birthday = birthday; } public String getSex() { return sex; } public void setSex(String sex) { this.sex = sex; } public String getAddress() { return address; } public void setAddress(String address) { this.address = address; } @Override public String toString() { return "User{" + "id=" + id + ", username='" + username + ''' + ", birthday=" + birthday + ", sex='" + sex + ''' + ", address='" + address + ''' + '}'; } }

iuserdao.java

package com.fanyafeng.dao; import com.fanyafeng.model.User; import java.util.List; /** * Author： fanyafeng * Data： 16/10/11 14:55 * Email: fanyafeng@live.cn */ public interface IUserDao { public List<User> queryUserByName(String name); public User selectUserById(int id); public void add(); public void del(int id); public void alter(int id); }

user.xml

<"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.fanyafeng.dao.IUserDao"> <select id="selectUserById" parameterType="int" resultType="com.fanyafeng.model.User"> select * from user where id = #{id} </select> <> <select id="queryUserByName" parameterType="String" resultType="com.fanyafeng.model.User"> SELECT * FROM user WHERE username LIKE #{name} </select> <> <insert id="add" parameterType="com.fanyafeng.model.User"> insert into user (id,username,birthday,sex,address) values (#{id},#{username},#{birthday},#{sex},#{address}) </insert> </mapper>

usertest.java

package com.fanyafeng.test; import com.fanyafeng.model.User; 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 java.io.IOException; import java.io.Reader; import java.util.Date; import java.util.List; /** * Author： fanyafeng * Data： 16/10/11 14:58 * Email: fanyafeng@live.cn */ public class UserTest { private static SqlSessionFactory sqlSessionFactory; private static Reader reader; static { try { reader = Resources.getResourceAsReader("Configuration.xml"); sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader); } catch (IOException e) { e.printStackTrace(); } } public static void main(String[] args) { SqlSession sqlSession = sqlSessionFactory.openSession(); try { // User user = (User) sqlSession.selectOne("com.fanyafeng.dao.IUserDao.selectUserById", 2); // System.out.println(user.getAddress() + user.getSex() + user.getBirthday()); // System.out.println(user.getId() + user.getUsername()); // // List<User> userList = sqlSession.selectList("com.fanyafeng.dao.IUserDao.queryUserByName", "%李宁%"); for (int i = 0; i < userList.size(); i++) { System.out.println(userList.get(i).toString()); } User user = new User(); user.setId(100); user.setBirthday(new Date()); user.setUsername("李宁"); user.setSex("女"); user.setAddress("家里蹲"); int isAdd = sqlSession.insert("com.fanyafeng.dao.IUserDao.add", user); sqlSession.commit();//不要忘记 } finally { sqlSession.close(); } } }

configration.xml

<"1.0" encoding="UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <> <> <> <> <> <environments default="development"> <environment id="development"> <> <transactionManager type="JDBC"/> <> <dataSource type="POOLED"> <property name="driver" value="com.mysql.jdbc.Driver"/> <property name="url" value="jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf-8"/> <property name="username" value="root"/> <property name="password" value=""/> </dataSource> </environment> </environments> <mappers> <mapper resource="com/fanyafeng/model/User.xml"/> </mappers> </configuration>

log4j的话大家根据自己的爱好添加就好了，代码中注释写的很详细了，我就不细讲了，这里有个地方让我很憋屈，问了个大神才知道咋回事，截图中有target目录吧，这是编译好文件的存放位置，可是，问题来了，java文件给我编译好放在哪里了，可是非resource得xml文件没有给我放进去，丢出来了一个异常，查了好多资料答非所问，然后是这样解决的

看一下pom.xml文件，我更改后的，加了build标签中了

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.fanyafeng</groupId> <artifactId>mybatisdemo</artifactId> <packaging>war</packaging> <version>1.0-SNAPSHOT</version> <name>mybatisdemo Maven Webapp</name> <url>http://maven.apache.org</url> <build> <finalName>mybatisdemo</finalName> <resources> <resource> <directory>src/main/resources</directory> <includes> <include>**/*.xml</include> <include>**/*.properties</include> </includes> </resource> <resource> <directory>src/main/java</directory> <includes> <include>**/*.xml</include> </includes> </resource> </resources> </build> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</version> <scope>test</scope> </dependency> <> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.38</version> </dependency> <> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.2.8</version> </dependency> <> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>1.7.21</version> </dependency> <> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>1.7.21</version> </dependency> <> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency> <> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-core</artifactId> <version>2.5</version> </dependency> <> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-api</artifactId> <version>2.5</version> </dependency> <> <dependency> <groupId>org.javassist</groupId> <artifactId>javassist</artifactId> <version>3.18.1-GA</version> </dependency> <> <dependency> <groupId>commons-logging</groupId> <artifactId>commons-logging</artifactId> <version>1.1.1</version> </dependency> <> <dependency> <groupId>cglib</groupId> <artifactId>cglib</artifactId> <version>2.2.2</version> </dependency> <> <dependency> <groupId>asm</groupId> <artifactId>asm</artifactId> <version>3.3.1</version> </dependency> </dependencies> </project>

这就可以了，我这里实现了查，增，别的正在学习中。

以上所述是小编给大家介绍的Intellij Mybatis连接Mysql数据库，希望对大家有所帮助，如果大家有任何疑问请给我们留言，小编会及时回复大家的。在此也非常感谢大家对查字典教程网的支持！