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整体项目结构
bean 代码
package bean;
public class Apply {
private long id;
private String sname;
private String qq;
private long enterTime;
private String type;
private String school;
private long number;
private String repLink;
private String goal;
@Override
public String toString() {
return "Apply{" +
"id=" + id +
", sname='" + sname + '\'' +
", qq='" + qq + '\'' +
", enterTime=" + enterTime +
", type='" + type + '\'' +
", school='" + school + '\'' +
", number=" + number +
", repLink='" + repLink + '\'' +
", goal='" + goal + '\'' +
'}';
}
public Apply() {}
public Apply(int id, String sname, String qq, long enterTime, String type, String school, long number, String repLink, String goal) {
this.id = id;
this.sname = sname;
this.qq = qq;
this.enterTime = enterTime;
this.type = type;
this.school = school;
this.number = number;
this.repLink = repLink;
this.goal = goal;
}
public Apply(String sname, String qq, long enterTime, String type, String school, long number, String repLink, String goal) {
this.sname = sname;
this.qq = qq;
this.enterTime = enterTime;
this.type = type;
this.school = school;
this.number = number;
this.repLink = repLink;
this.goal = goal;
}
public long getId() {return id;}
public void setId(long id) {this.id = id;}
public String getSname() {return sname;}
public void setSname(String sname) {this.sname = sname;}
public String getQq() {return qq;}
public void setQq(String qq) {this.qq = qq;}
public long getEnterTime() {return enterTime;}
public void setEnterTime(long enterTime) {this.enterTime = enterTime;}
public String getType() {return type;}
public void setType(String type) {this.type = type;}
public String getSchool() {return school;}
public void setSchool(String school) {this.school = school;}
public long getNumber() {return number;}
public void setNumber(long number) {this.number = number;}
public String getRepLink() {return repLink;}
public void setRepLink(String repLink) {this.repLink = repLink;}
public String getGoal() {return goal;}
public void setGoal(String goal) {this.goal = goal;}
}
bean 映射文件 apply.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="test">
<!-- 在映射文件中配置很多 sql 语句 -->
<!-- 将 sql 语句封装到 mappedStatement 对象中，所以将 id 称为 statement 的 id -->
<!-- parameterType：指定输入参数的类型，这里指定 int 型 #{} 表示一个占位符号 -->
<!-- #{id}：其中的 id 表示接收输入的参数，参数名称就是 id，如果输入 -->
<!-- 参数是简单类型，#{} 中的参数名可以任意，可以 value 或其它名称 -->
<!-- resultType：指定 sql 输出结果的所映射的 java 对象类型，select 指定 resultType 表示将单条记录映射成的 java 对象。-->
<!-- 表名要对，但是不区分大小写，resultType 要写类名，同样不区分大小写 -->
<select id="getApply" parameterType="int" resultType="apply">
SELECT * FROM applytable WHERE id = #{value}
</select>
<insert id="addApply" parameterType="bean.Apply">
insert into applytable(id,sname, qq, entertime, `type`, school,`number`,replink,goal)
values (
null,
#{sname},
#{qq},
#{enterTime},
#{type},
#{school},
#{number},
#{repLink},
#{goal}
)
</insert>
<update id="updateApply" parameterType="bean.Apply">
update applytable set sname = #{sname}, qq = #{qq},
entertime = #{enterTime}, `type` = #{type}, school = #{school},`number` = #{number}, replink = #{repLink}, goal = #{goal}
where id = #{id}
</update>
<select id="getAllApply" resultType="bean.Apply">
select * from applytable order by id desc
</select>
<select id="getTotalApply" resultType="int">
select count(*) from applytable
</select>
<delete id="deleteApply" parameterType="int">
delete from applytable where id = #{id}
</delete>
</mapper> 数据库属性文件 config.properties
jdbc.driver = com.mysql.jdbc.Driver
jdbc.url = jdbc:mysql://localhost:3306/xiuzhenyuan?characterEncoding=UTF-8
jdbc.username = root
jdbc.password = adminMyBatis 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>
<!-- 加载属性文件 -->
<properties resource="config.properties">
<!--properties 中还可以配置一些属性名和属性值 -->
<!-- <property name="jdbc.driver" value=""/> -->
</properties>
<!-- 全局配置参数，需要时再设置 -->
<!-- <settings> </settings> -->
<typeAliases>
<!-- 别名定义 -->
<!-- 针对单个别名定义 type：类型的路径 alias：别名，类名不能写错
别名可以随便起，但最好规范 -->
<typeAlias type="bean.Apply" alias="apply" />
<!-- 批量别名定义 指定包名，mybatis 自动扫描包中的 po 类，自动定义别名，别名就是类名（首字母大写或小写都可以）-->
<package name="bean.Apply" />
</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，事务控制由 mybatis -->
<transactionManager type="JDBC" />
<!-- 数据库连接池，由 mybatis 管理 -->
<dataSource type="POOLED">
<property name="driver" value="${jdbc.driver}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
</dataSource>
</environment>
</environments>
<!-- 加载映射文件 -->
<mappers>
<!-- 通过 resource 方法一次加载一个映射文件 -->
<!-- 注意这里的路径和 xml 文件 -->
<mapper resource="mappers/apply.xml" />
<!-- 批量加载 mapper 指定 mapper 接口的包名，mybatis 自动扫描包下边所有 mapper 接口进行加载 -->
<!-- 遵循一些规范：需要将 mapper 接口类名和 mapper.xml 映射文件名称保持一致，且在一个目录 -->
<!-- 中上边规范的前提是：使用的是 mapper 代理方法
<package name="...." />-->
</mappers>
</configuration> 单元测试代码 ApplyTest.java
package com.jms;
import bean.Apply;
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;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
public class ApplyTest {public SqlSessionFactory getSqlSessionFactory() throws IOException {
// mybatis 配置文件，这个地方的 root 地址为：resources，路径要对。String resource = "mybatis-config.xml";
// 得到配置文件流
InputStream inputStream = Resources.getResourceAsStream(resource);
// 创建会话工厂，传入 mybatis 的配置文件信息
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
return sqlSessionFactory;
}
// 根据 id 查询用户信息，得到一条记录结果
@Test
public void getApply() throws IOException {
// 通过工厂得到 SqlSession
SqlSession sqlSession = this.getSqlSessionFactory().openSession();
// 通过 SqlSession 操作数据库
// 第一个参数：映射文件中 statement 的 id，等于 =namespace+"."+statement 的 id
// 第二个参数：指定和映射文件中所匹配的 parameterType 类型的参数
// sqlSession.selectOne 结果 是与映射文件中所匹配的 resultType 类型的对象
// selectOne 查询出一条记录（这种很麻烦的！！！往后看看）// 这里的参数 test.findUserById，test 为命名空间，要与 user.xml 中的对应起来，// 同理，findUserById 也要在 user.xml 中存在，不然都会报错
Apply apply = sqlSession.selectOne("test.getApply", 2);
// 释放资源
sqlSession.close();}
@Test
public void addApply() throws IOException {SqlSession sqlSession = this.getSqlSessionFactory().openSession();
sqlSession.insert("test.addApply", new Apply("Alice", "43523", 3452341, "Html", "SCHOOL", 4, "hgw3204", "DAY DAY UP"));
sqlSession.commit();
sqlSession.close();}
@Test
public void updateApply() throws IOException {SqlSession sqlSession = this.getSqlSessionFactory().openSession();
sqlSession.update("test.updateApply", new Apply(2, "Alice", "43523", 3452341, "Html", "SCHOOL", 4, "hgw3204", "DAY DAY UP"));
sqlSession.commit();
sqlSession.close();}
@Test
public void getAll() throws IOException {SqlSession sqlSession = this.getSqlSessionFactory().openSession();
final List<Apply> selectList = sqlSession.selectList("test.getAllApply");
for (Apply apply :
selectList) {System.out.println(apply);
}
sqlSession.close();}
@Test
public void getTotal() throws IOException {SqlSession sqlSession = this.getSqlSessionFactory().openSession();
final Integer total = (Integer) sqlSession.selectOne("test.getTotalApply");
System.out.println(total);
}
@Test
public void delete() throws IOException {SqlSession sqlSession = this.getSqlSessionFactory().openSession();
sqlSession.delete("test.deleteApply", 20);
sqlSession.commit();
sqlSession.close();}
}
单元测试结果
正文完
