Mybatis入门（一）——单条数据查询

最新推荐文章于 2024-04-01 17:24:02 发布

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最新推荐文章于 2024-04-01 17:24:02 发布

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文章标签： java 数据库

原文链接：http://www.cnblogs.com/Ckeyboard/p/5623082.html

本文介绍如何使用MyBatis进行简单的单条数据查询操作，包括环境搭建、表结构定义、配置文件设置、Mapper文件编写及数据获取过程。

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MyBatis入门（一）—单条数据查询

准备：

mybatis-3.4.1.jar

mysql-connector-java-5.1.26-bin.jar

1.创建普通java项目，导入jar包

2.建表

CREATE TABLE `student` (
  `Sno` varchar(7) NOT NULL,
  `Sname` varchar(10) NOT NULL,
  `Ssex` char(4) DEFAULT NULL,
  `Sage` varchar(11) DEFAULT NULL,
  `Sdept` varchar(20) DEFAULT '计算机系',
  `c_id` varchar(30) DEFAULT NULL,
  PRIMARY KEY (`Sno`)
)

3.创建配置文件

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="development">
            <environment id="development">
                <transactionManager type="JDBC"/>
                <dataSource type="POOLED">
                    <property name="driver" value="com.mysql.jdbc.Driver"/>
                    <property name="url" value="jdbc:mysql://127.0.0.1/test"/>
                    <property name="username" value="root"/>
                    <property name="password" value="1234"/>
                </dataSource>
            </environment>
    </environments>
    <mappers>
        <mapper resource="com/bean/StudentInforMapping.xml"/>
    </mappers>
</configuration>

4.新建StudentBean.java文件

Student.java

package com.bean;

public class Student {

    private String sno;
     public String getSno() {
        return sno;
    }
    public void setSno(String sno) {
        this.sno = sno;
    }
    public String getsName() {
        return sName;
    }
    public void setsName(String sName) {
        this.sName = sName;
    }
    public String getsSex() {
        return sSex;
    }
    public void setsSex(String sSex) {
        this.sSex = sSex;
    }
    public String getsAge() {
        return sAge;
    }
    public void setsAge(String sAge) {
        this.sAge = sAge;
    }
    public String getsDept() {
        return sDept;
    }
    public void setsDept(String sDept) {
        this.sDept = sDept;
    }
    public String sName;
     public String sSex;
     public String sAge;
     public String sDept;
     public String getcId() {
        return cId;
    }
    public void setcId(String cId) {
        this.cId = cId;
    }
    private String cId;
    public Student(String sno, String sName, String sSex, String sAge,
            String sDept,String cId) {
        super();
        this.sno = sno;
        this.sName = sName;
        this.sSex = sSex;
        this.sAge = sAge;
        this.sDept = sDept;
        this.cId=cId;
    }
    public Student() {
        super();
    }

}

5.新建StudentMapper.xml文件

studentMapping.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">
<mapper namespace="com.bean.StudentMapping">
    <select id="getStudent" parameterType="String" resultType="com.bean.Student">
        select * from student where sno = #{sno}
    </select>

</mapper>

参数解释：

namespace:唯一标示一个mapper.

parameterType:参数类型。

resultType:返回结果类型（反射思想）。

6.获取数据

package com;

import java.io.IOException;
import java.io.Reader;

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 com.bean.Student;

public class Main {

    /**
     * @param args
     * @throws IOException 
     */
    public static void main(String[] args) throws IOException {
        // TODO Auto-generated method stub
        String xmlPath="config-mybatis.xml";
        Reader reader=Resources.getResourceAsReader(xmlPath);
        SqlSessionFactory sqlSessionFactory=new SqlSessionFactoryBuilder().build(reader);
        SqlSession sqlSession=sqlSessionFactory.openSession();
        String statement="com.bean.StudentInforMapping"+".getStudent";
        Student studentInfor=sqlSession.selectOne(statement, "111");
        System.out.println(studentInfor.getsName());
    }

}