8.MyBatos的动态Sql

1.创建javaWeb项目MyBatis_dynamicSQL并在WebRoot下的WEB-INF下的lib下添加如下jar文件

cglib-nodep-2.1_3.jar

log4j-1.2.17.jar

mybatis-3.2.3.jar

ojdbc14.jar

创建如下userinfo.sql

SQL> create table userinfo
(id number(4),
name varchar2(50),
password varchar2(20
telephone varchar2(15),
isadmin varchar2(5));

SQL> --4.2 用户表序列
SQL> create sequence seq_userinfo;

SQL> alter table userinfo add constraint pk_userinfo_id primary key(id);

SQL> insert into userinfo values(seq_userinfo.nextval,'holly','123','134518024
','是');

SQL> commit;

2.在src下创建log4j.properties日志文件

log4j.properties

3..在src下创建Configuration.xml主配置文件

 <?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="oracle.jdbc.driver.OracleDriver"/>
          <property name="url" value="jdbc:oracle:thin:@127.0.0.1:1521:orcl"/>
          <property name="username" value="system"/>
          <property name="password" value="accp"/>
       </dataSource>
     </environment>
   </environments>
   <mappers>
     <mapper resource="com/mapper/UserInfoMapper.xml"/>
   </mappers>
 </configuration>

Configuration.xml

4.在src下com.entity包下创建UserInfo.java

 package com.entity;

 import java.util.ArrayList;
 import java.util.List;

 /**
  * 用户信息表
  * @author Dell
  *
  */
 public class UserInfo {
     private Integer id; //编号
     private String name; //姓名
     private String password; //密码
     private String telephone; //电话
     private String isadmin; //是否是管理员
     private List<Integer> ids=new ArrayList<Integer>();

     public UserInfo() {
     }

     public UserInfo(Integer id, String name, String password, String telephone,
             String isadmin) {
         this.id = id;
         this.name = name;
         this.password = password;
         this.telephone = telephone;
         this.isadmin = isadmin;
     }

     public UserInfo(String name, String password) {
         this.name = name;
         this.password = password;
     }

     public Integer getId() {
         return id;
     }

     public void setId(Integer id) {
         this.id = id;
     }

     public String getName() {
         return name;
     }

     public void setName(String name) {
         this.name = name;
     }

     public String getPassword() {
         return password;
     }

     public void setPassword(String password) {
         this.password = password;
     }

     public String getTelephone() {
         return telephone;
     }

     public void setTelephone(String telephone) {
         this.telephone = telephone;
     }

     public String getIsadmin() {
         return isadmin;
     }

     public void setIsadmin(String isadmin) {
         this.isadmin = isadmin;
     }

     public List<Integer> getIds() {
         return ids;
     }

     public void setIds(List<Integer> ids) {
         this.ids = ids;
     }

     @Override
     public String toString() {
         return "UserInfo [id=" + id + ", ids=" + ids + ", isadmin=" + isadmin
                 + ", name=" + name + ", password=" + password + ", telephone="
                 + telephone + "]";
     }

 }

UserInfo.java

5.在src下com.util包下创建MyBatisUtil.java

MyBatisUtil.java

6.在src下com.mapper包下创建UserInfoMapper.java接口

 package com.mapper;

 import java.util.List;

 import com.entity.UserInfo;
 /**
  * 数据访问层接口
  * @author pc
  *
  */
 public interface UserInfoMapper {
     /**
      * 1.根据用户信息查询某个用户
      * @param userinfo
      * @return
      */
     UserInfo findNamePwd(UserInfo userinfo);

     /**
      * 2.添加用户信息
      * @param userinfo
      */
     void addUserInfo(UserInfo userinfo);

     /**
      * 3.查询所有
      * @return
      */
     List<UserInfo> findAll(UserInfo userinfo);

     /**
      * 4.删除
      * @param id
      */
     void deleteUser(int id);
     /**
      * 5.修改
      * @param userinfo
      */
     void updateUser(UserInfo userinfo);

     /**
      * 6.根据id查询
      */
     UserInfo findId(int id);
 }

UserInfoMapper.java

7.在src下com.mapper包下创建UserInfoMapper.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.mapper.UserInfoMapper">
   <!-- 定义sql片段，该片段中不包含where，也就是定义公共sql部分 -->
   <sql id="id_where">
      <if test="id!=null and id!=''">
         and id=#{id}
      </if>
   </sql>

   <!-- 根据用户查询用户 -->
   <select id="findNamePwd" parameterType="com.entity.UserInfo" resultType="com.entity.UserInfo">
     select * from userinfo
     <!-- 动态sql -->
     <where>

        <!--name，password，这个参数是输入参数对象的 属性-->
       <if test="name!=null and name!=''">
             and name=#{name}
       </if>
       <if test="password!=null and password!=''">
             and password=#{password}
       </if>
     </where>

   </select>

   <!-- 插入用户信息 -->
   <insert id="addUserInfo" parameterType="com.entity.UserInfo">
      insert into userinfo values(seq_userinfo.nextval,#{name},#{password},#{telephone},#{isadmin})
   </insert>

   <!-- 查询所有 -->
   <select id="findAll" resultType="com.entity.UserInfo" parameterType="com.entity.UserInfo">
     select * from userinfo
     <where>
       <if test="ids!=null">
          <foreach collection="ids" item="id" open="and id in(" close=")" separator=",">
             #{id}
          </foreach>
       </if>
     </where>
   </select>

    <!-- 删除 -->
    <delete id="deleteUser" parameterType="int">
      delete from userinfo
      <!-- 动态sql中引用sql片段 -->

      <where>
         <!-- 引用sql片段的id，如果refid指定的不在本映射文件中，需要前面加namespace -->
         <include refid="id_where"/>
         <!-- 这里可以引用其他的sql片段 -->
      </where>
       where id=#{id}
    </delete>

    <!-- 修改 -->
    <update id="updateUser" parameterType="com.entity.UserInfo">
      update userinfo set name=#{name},password=#{password},telephone=#{telephone},isadmin=#{isadmin} where id=#{id}
    </update>

    <!-- 根据id查询 -->
    <select id="findId" parameterType="int" resultType="com.entity.UserInfo">
     select * from userinfo where id=#{id}

    </select>

 </mapper>

UserInfoMapper.xml

8.在src下com.test包下创建Test.java

 package com.test;

 import java.util.ArrayList;
 import java.util.List;

 import org.apache.ibatis.session.SqlSession;

 import com.entity.UserInfo;
 import com.mapper.UserInfoMapper;
 import com.util.MybatisUtil;

 public class Test {

     /**
      * @param args
      */
     public static void main(String[] args) {
         SqlSession sqlSession=MybatisUtil.getSqlSession(false);
         UserInfoMapper mapper=sqlSession.getMapper(UserInfoMapper.class);
         UserInfo userinfo=new UserInfo("李杰", "123");
 //        UserInfo info=mapper.findNamePwd(userinfo);
 //        if(info!=null){
 //            System.out.println("登陆成功");
 //        }else{
 //            System.out.println("登陆失败");
 //
 //        }

         List<Integer> ids=new ArrayList<Integer>();
         ids.add(22);
         ids.add(23);
         ids.add(24);
         userinfo.setIds(ids);

         List<UserInfo> userin=mapper.findAll(userinfo);
         System.out.println(userin);

     }

 }

Test.java