mybatis入门程序开发步骤教程

川长思鸟来 2023-10-05 11:17 9阅读 0赞

### mybatis入门程序 ###

![在这里插入图片描述][20201008003031837.png_pic_center]

1.  新建maven项目
2.  配置项目jdk
3.  pom.xml导入依赖,非maven项目则导入jar包  
    ![在这里插入图片描述][20201008003152870.png_pic_center]

<dependencies>
    		
    		<dependency>
    			<groupId>org.mybatis</groupId>
    			<artifactId>mybatis</artifactId>
    			<version>3.5.3</version>
    		</dependency>
    		
    		<dependency>
    			<groupId>mysql</groupId>
    			<artifactId>mysql-connector-java</artifactId>
    			<version>5.1.47</version>
    		</dependency>
    		
    		<dependency>
    			<groupId>log4j</groupId>
    			<artifactId>log4j</artifactId>
    			<version>1.2.17</version>
    		</dependency>
    	</dependencies>

1.  配置log4j文件  
    如果没有可以新建一个

log4j.properties
    log4j.rootLogger = debug,stdout,D,E
    
    log4j.appender.stdout = org.apache.log4j.ConsoleAppender
    log4j.appender.stdout.Target = System.out
    log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
    log4j.appender.stdout.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n
    
    log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
    log4j.appender.D.File = E://logs//mybatis//log.log
    log4j.appender.D.Append = true
    log4j.appender.D.Threshold = DEBUG 
    log4j.appender.D.layout = org.apache.log4j.PatternLayout
    log4j.appender.D.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n
    
    log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
    log4j.appender.E.File =E://logs//mybatis//error.log
    log4j.appender.E.Append = true
    log4j.appender.E.Threshold = ERROR 
    log4j.appender.E.layout = org.apache.log4j.PatternLayout
    log4j.appender.E.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n

1.  创建数据库和表

DROP TABLE IF EXISTS `employee`;
    CREATE TABLE `employee`  (
      `empid` int(11) NOT NULL AUTO_INCREMENT,
      `name` varchar(55) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
      `gender` int(1) DEFAULT NULL,
      `birthday` date DEFAULT NULL,
      `mobile` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
      `email` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
      `position` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
      `note` varchar(256) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
      PRIMARY KEY (`empid`) USING BTREE
    ) ENGINE = InnoDB AUTO_INCREMENT = 19 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Compact;
    
    -- ----------------------------
    -- Records of employee
    -- ----------------------------
    INSERT INTO `employee` VALUES (1, '张三', 1, '1999-10-01', '13554875022', '3265487955@qq.com', '前端工程师', NULL);
    INSERT INTO `employee` VALUES (2, '王五', 1, '2020-10-05', '13654458553', '123456@qq.com', '大数据工程师', '新增');
    INSERT INTO `employee` VALUES (3, '李刚', 1, '2020-10-02', '12554415223', '2336525412@qq.com', 'java工程师', NULL);
    INSERT INTO `employee` VALUES (4, '王超', 1, '1999-06-30', '13555288510', '255561223@qq', 'python工程师', NULL);
    INSERT INTO `employee` VALUES (5, '李欣', 0, '2000-10-02', '13655144012', '125456585@qq.com', 'java工程师', NULL);
    INSERT INTO `employee` VALUES (18, '李四', 1, '2020-10-07', '1365445855', '123456@qq.com', '工程师', '新增');
    
    SET FOREIGN_KEY_CHECKS = 1;

1.  创建持久化类（实体类pojo）

public class Employee implements Serializable {
        
    
    	private static final long serialVersionUID = 1L;
    	private Integer empId;
    	private String name;
    	private Integer gender;
    	private Date birthday;
    	private String mobile;
    	private String email;
    	private String position;
    	private String note;
    	public Integer getEmpId() {
        
    		return empId;
    	}
    	public void setEmpId(Integer empId) {
        
    		this.empId = empId;
    	}
    	public String getName() {
        
    		return name;
    	}
    	public void setName(String name) {
        
    		this.name = name;
    	}
    	public Integer getGender() {
        
    		return gender;
    	}
    	public void setGender(Integer gender) {
        
    		this.gender = gender;
    	}
    	public Date getBirthday() {
        
    		return birthday;
    	}
    	public void setBirthday(Date birthday) {
        
    		this.birthday = birthday;
    	}
    	public String getMobile() {
        
    		return mobile;
    	}
    	public void setMobile(String mobile) {
        
    		this.mobile = mobile;
    	}
    	public String getEmail() {
        
    		return email;
    	}
    	public void setEmail(String email) {
        
    		this.email = email;
    	}
    	public String getPosition() {
        
    		return position;
    	}
    	public void setPosition(String position) {
        
    		this.position = position;
    	}
    	public String getNote() {
        
    		return note;
    	}
    	public void setNote(String note) {
        
    		this.note = note;
    	}
    	@Override
    	public String toString() {
        
    		return "Employee [empId=" + empId + ", name=" + name + ", gender=" + gender + ", birthday=" + birthday
    				+ ", mobile=" + mobile + ", email=" + email + ", position=" + position + ", note=" + note + "]";
    	}
    	public Employee(String name, Integer gender, Date birthday, String mobile, String email, String position,
    			String note) {
        
    		super();
    		this.name = name;
    		this.gender = gender;
    		this.birthday = birthday;
    		this.mobile = mobile;
    		this.email = email;
    		this.position = position;
    		this.note = note;
    	}
    	public Employee() {
        
    		super();
    	}
    	
    }

1.  创建mybatis映射文件(xxxmapper.xml)

1.  映射文件中编写sql语句

<?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.zwh.mapper.EmployeeMapper">
    
    <select id="selectEmployee" parameterType="Integer" resultType="com.zwh.pojo.Employee">
    	select * from employee where empid=#{empId}
    </select>
    </mapper>

1.  创建mybatis核心配置文件(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>
    	
    	<environments default="mysql">
    	
    		<environment id="mysql">
    		
    			<transactionManager type="JDBC"></transactionManager>
    			
    			<dataSource type="POOLED">
    				<property name="driver" value="com.mysql.jdbc.Driver" />
    				<property name="url"
    					value="jdbc:mysql://127.0.0.1:3306/mybatisdb?characterEncoding=utf-8" />
    				<property name="username" value="root" />
    				<property name="password" value="123456" />
    			</dataSource>
    		</environment>
    	</environments>
    	
    	<mappers>
    		<mapper resource="com/zwh/mapper/EmployeeMapper.xml" />
    	</mappers>
    </configuration>

1.  编写测试类

import java.io.IOException;
    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;
    
    public class test {
        
    	@Test
    	public void selectEmployee() throws IOException {
        
    		/* 读取配置文件 */
    		InputStream inputStream = Resources.getResourceAsStream("mybatis-config.xml");
    		/* 根据配置文件构建SqlSessionFactory会话工厂 */
    		SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
    		/* 通过SqlSessionFactory创建SqlSession */
    		SqlSession sqlSession = sqlSessionFactory.openSession();
    		/* SqlSession执行映射文件中自定义的SQL，并返回映射结果 */
    		try {
        
    			Employee employee = sqlSession.selectOne("com.zwh.mapper.EmployeeMapper.selectEmployee", 1);
    			System.out.println(employee);
    		} finally {
        
    			/*关闭SqlSession*/
    			sqlSession.close();
    		}
    	}
    }

[20201008003031837.png_pic_center]: https://img-blog.csdnimg.cn/20201008003031837.png#pic_center
[20201008003152870.png_pic_center]: https://img-blog.csdnimg.cn/20201008003152870.png#pic_center