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
<?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">
<!--resultType 指定单条记录返回的类型-->
<mapper namespace="com.fanyafeng.dao.IUserDao">
<select id="selectUserById" parameterType="int" resultType="com.fanyafeng.model.User">
select * from user where id = #{id}
</select>
<!--'%${value}' 表示拼接sql串,只能使用value,有可能会引起sql注入的情况-->
<select id="queryUserByName" parameterType="String" resultType="com.fanyafeng.model.User">
SELECT * FROM user WHERE username LIKE #{name}
</select>
<!--INSERT INTO USER (id,username,sex,address) VALUE (null,"陈潇然","女","大学同学")-->
<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
<?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> <!--如果在mapper中进行配置了,此处可以省略配置--> <!--<typeAliases>--> <!--<typeAlias alias="User" type="com.fanyafeng.model.User"/>--> <!--</typeAliases>--> <!-- 和spring整合后 environments配置将废除--> <environments default="development"> <environment id="development"> <!-- 使用jdbc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/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> <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.38</version> </dependency> <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.2.8</version> </dependency> <!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-log4j12 --> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>1.7.21</version> </dependency> <!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-api --> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>1.7.21</version> </dependency> <!-- https://mvnrepository.com/artifact/log4j/log4j --> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency> <!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core --> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-core</artifactId> <version>2.5</version> </dependency> <!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-api --> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-api</artifactId> <version>2.5</version> </dependency> <!-- https://mvnrepository.com/artifact/org.javassist/javassist --> <dependency> <groupId>org.javassist</groupId> <artifactId>javassist</artifactId> <version>3.18.1-GA</version> </dependency> <!-- https://mvnrepository.com/artifact/commons-logging/commons-logging --> <dependency> <groupId>commons-logging</groupId> <artifactId>commons-logging</artifactId> <version>1.1.1</version> </dependency> <!-- https://mvnrepository.com/artifact/cglib/cglib --> <dependency> <groupId>cglib</groupId> <artifactId>cglib</artifactId> <version>2.2.2</version> </dependency> <!-- https://mvnrepository.com/artifact/asm/asm --> <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留言，小编会及时回复大家的。在此也非常感谢大家对网站的支持！
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时间： 2024-10-26 09:13:19