MyBatis学习简单入门
使用的是myEclipse8.5.
1>建立一个web project-MyBatis;
2>导入需要的jar包；mybatis-...jar,ojdbc14.jar等需要的jar包；
3>创建jdbc.properties，内容如下：(以下的四个值是必须的，也可以添加自己需要的，根据自己的情况来填写。)
driverClassName=
url=
username=
password=
4>创建mybatis_config.xml,内容如下：
<?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>
<properties resource="jdbc.properties"></properties>
<typeAliases>
<typeAlias type="com.mybatis.SysUser" alias="user"/>
</typeAliases>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC">
</transactionManager>
<dataSource type="POOLED">
<property name="driver" value="${driverClassName}"/>
<property name="url" value="${url}"/>
<property name="username" value="${username}"/>
<property name="password" value="${password}"/>
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="com/mybatis/sys_user.xml"/>
</mappers>
</configuration>
5>创建数据库表映射类SysUser.java:
package com.mybatis;
import java.sql.Date;
public class SysUser {
private String id;// 主键id
private String techId;// 技术人员表id
private String userName;// 用户账号
private String userLevel;
private String password;// 用户密码
private String trueName;// 真是姓名
private String openFlag;// 启用标识，1启用，0禁用
private String defaultModule;// 默认首页
private String remark;// 备注
private Date createDate;
private String createPname;
private String modifyPname;
private Date modifyDate;
private String organName;
private String organId;
private String signature;
private String cardId;
private String phoneNo;
public String getUserLevel() {
return userLevel;
}
public void setUserLevel(String userLevel) {
this.userLevel = userLevel;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getTechId() {
return techId;
}
public void setTechId(String techId) {
this.techId = techId;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getTrueName() {
return trueName;
}
public void setTrueName(String trueName) {
this.trueName = trueName;
}
public String getOpenFlag() {
return openFlag;
}
public void setOpenFlag(String openFlag) {
this.openFlag = openFlag;
}
public String getDefaultModule() {
return defaultModule;
}
public void setDefaultModule(String defaultModule) {
this.defaultModule = defaultModule;
}
public String getRemark() {
return remark;
}
public void setRemark(String remark) {
this.remark = remark;
}
public Date getCreateDate() {
return createDate;
}
public void setCreateDate(Date createDate) {
this.createDate = createDate;
}
public String getCreatePname() {
return createPname;
}
public void setCreatePname(String createPname) {
this.createPname = createPname;
}
public String getModifyPname() {
return modifyPname;
}
public void setModifyPname(String modifyPname) {
this.modifyPname = modifyPname;
}
public Date getModifyDate() {
return modifyDate;
}
public void setModifyDate(Date modifyDate) {
this.modifyDate = modifyDate;
}
public String getOrganName() {
return organName;
}
public void setOrganName(String organName) {
this.organName = organName;
}
public String getOrganId() {
return organId;
}
public void setOrganId(String organId) {
this.organId = organId;
}
public String getSignature() {
return signature;
}
public void setSignature(String signature) {
this.signature = signature;
}
public String getCardId() {
return cardId;
}
public void setCardId(String cardId) {
this.cardId = cardId;
}
public String getPhoneNo() {
return phoneNo;
}
public void setPhoneNo(String phoneNo) {
this.phoneNo = phoneNo;
}
}
6>创建数据库数据查询sys_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">
<mapper namespace="com.mybatis.IUserOperation">
<resultMap id="baseresultmap" type="com.mybatis.SysUser" >
<id column="ID" property="id"/>
<result column="TECH_ID" property="techId"/>
<result column="USERNAME" property="userName" />
<result column="USER_LEVEL" property="userLevel"/>
<result column="ORGAN_NAME" property="organName"/>
<result column="ORGAN_ID" property="organId" />
<result column="PASSWORD" property="password" />
<result column="TRUE_NAME" property="trueName" />
<result column="OPEN_FLAG" property="openFlag" />
<result column="DEFAULT_MODULE" property="defaultModule" />
<result column="REMARK" property="remark" />
<result column="CREATE_DATE" property="createDate" />
<result column="CREATE_PNAME" property="createPname" />
<result column="MODIFY_DATE" property="modifyDate" />
<result column="MODIFY_PNAME" property="modifyPname" />
<result column="CARD_ID" property="cardId" />
<result column="SIGNATURE" property="signature"/>
<result column="PHONE_NO" property="phoneNo" />
</resultMap>
<sql id="sys_user_column">
ID as id,
TRUE_NAME as trueName,
ORGAN_NAME as organName,
PHONE_NO as phoneNo
</sql>
<select id="findbyid" parameterType="string" resultType="string">
select true_name from sys_user where id=#{id}
</select>
<select id="findallbyid" parameterType="string" resultMap="baseresultmap">
select * from sys_user where id=#{id}
</select>
<select id="findall" resultMap="baseresultmap">
select * from sys_user
</select>
<select id="findsomebyid" parameterType="string" resultMap="baseresultmap">
select
<include refid="sys_user_column"/>
from sys_user where id=#{id}
</select>
</mapper>
7>进行测试，创建MybatisTest.java:
package com.mybatis;
import java.io.IOException;
import java.io.Reader;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
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.mybatis.dao.MybatisDao;
public class MybatisTest {
MybatisDao dao;
public static String resource = "mybatis_config.xml";
public static Reader reader;
public static SqlSessionFactoryBuilder builder;
public static SqlSessionFactory factory;
public static SqlSession session;
public static String id;
public static boolean really = false;
public static List<SysUser> lsu;
public static void main(String[] args) {
MybatisTest test = new MybatisTest();
try {
reader = Resources.getResourceAsReader(resource);
builder = new SqlSessionFactoryBuilder();
factory = builder.build(reader);
session = factory.openSession();
// 通过session.getMapper来调用接口（但是对应.xmL中namespace要对应好。）
IUserOperation iu = session.getMapper(IUserOperation.class);
SysUser suser = (SysUser) iu.findUserById("4028a58d439f117201439f7effec0016");
System.out.println(suser.getId());
// 通过session.select..来调用接口。
if (!really) {
System.out.println("查询sys_user中的所有数据");
lsu = test.findAll();
for (int i = 0; i < lsu.size(); i++) {
SysUser user = lsu.get(i);
System.out.println(user.getId() + "@" + user.getTrueName() + "@" + user.getCardId() + "@"
+ user.getPhoneNo());
}
}
/**
* 输入id号，查询数据；
*/
if (really) {
System.out.println("请输入查询id号:");
Scanner sc = new Scanner(System.in);
if (sc.hasNext()) {
id = sc.nextLine().toString();
System.out.println(test.findUserById());
System.out.println("------------findnamebyid");
System.out.println(test.findNameById());
System.out.println("查询部分数据属性");
SysUser su = test.findSomeById();
System.out.println(su.getId() + "@" + su.getTrueName() + "@" + su.getOrganName() + "@"
+ su.getPhoneNo());
}
}
} catch (IOException e) {
e.printStackTrace();
}
System.exit(0);
}
/**
* 从数据库查询，根据id查询user
*/
public String findUserById() {
session = factory.openSession();
SysUser user = (SysUser) session.selectOne("findallbyid", id);
session.commit();
return user.getId() + "@" + user.getTrueName() + "@" + user.getCardId() + "@" + user.getPhoneNo();
}
/**
* 从数据库查询，根据id查询name
*/
public String findNameById() {
session = factory.openSession();
String name = (String) session.selectOne("findbyid", id);
return name;
}
/**
* 查询sys_user中所有数据
*/
public List<SysUser> findAll() {
session = factory.openSession();
List<SysUser> ls = new ArrayList<SysUser>();
ls = session.selectList("findall");
return ls;
}
/**
* 根据id查询数据部分属性
*/
public SysUser findSomeById() {
session = factory.openSession();
SysUser s = (SysUser) session.selectOne("findsomebyid", id);
return s;
}
public MybatisDao getDao() {
return dao;
}
public void setDao(MybatisDao dao) {
this.dao = dao;
}
}
8>在以上测试类中，查询数据时，有两种方法，其中session.getMapper，需要的IUserOperation接口，创建方法如下：
package com.mybatis;
import java.util.List;
import org.apache.ibatis.annotations.Select;
public interface IUserOperation {
@Select("select * from sys_user WHERE id = #{id}")
public SysUser findUserById(String id);// 根据id查询用户信息
public String findNameById();// 根据id查询用户姓名或者其他属性
public List<SysUser> findAll();// 查询所有用户
public SysUser findSomeById();// 根据id查询用户部分属性
}
9>以上。全部建立完毕后，即可测试运行。具体的配置文件位置等，可以按照自己的习惯，因为仅是将mybatis运作起来，暂时没有太多的要求，下一步mybatis-spring-webwork的整合的时候，会需要注意一点。
关于为什么使用，mybatis，webwork框架是因为项目需要，自己重新学习一边，还有许多的不足，如果有不对的地方，希望您指出来，让我们共同进步吧，呵呵。