SSM框架之Mybatis SQL映射文件基本使用

SSM 框架学习 (MyBatis篇)

二、MyBatis SQL 映射文件的配置

条件模糊查询表信息
1、单个参数

    // UserMapper.java
    public interface UserMapper {
        public List getUserListByUserName(String userName);
    }

    // UserMapper.xml
    

    <select id="getUserListByUserName" resultType="User"
        parameterType="String">
        select * from smbms_user where userName like CONCAT
        ('%',#{userName},'%')
    select>

2、（传入参数：对象）

    // UserMapper.java
    public interface UserMapper {
        public List getUserListByUser(User user);
    }

    // UserMapper.xml
    
    <select id="getUserListByUser" resultType="User" parameterType="User">
        select * from smbms_user where userName like CONCAT
        ('%',#{userName},'%') and userRole = #{userRole}
    select>

3、（传入参数：Map）

    // UserMapper.java
    public interface UserMapper {
        public List getUserListByMap(Map userMap);
    }

    // UserMapper.xml
    
    <select id="getUserListByMap" resultType="User" parameterType="Map">
        select * from smbms_user where userName like CONCAT
        ('%',#{uName},'%') and userRole = #{uRole}
    select>

4、resultMap使用

    // UserMapper.xml
    
    <resultMap type="User" id="userList">
        <result property="id" column="id" />
        <result property="userCode" column="userCode" />
        <result property="userName" column="userName" />
        <result property="phone" column="phone" />
        <result property="birthday" column="birthday" />
        <result property="gender" column="gender" />
        <result property="userRole" column="userRole" />
        <result property="userRoleName" column="roleName" />
    resultMap>

    <select id="getUserListByUser" resultMap="userList" parameterType="User">
        select u.*,r.roleName from smbms_user u,smbms_role r
        where u.userName like CONCAT ('%',#{userName},'%')
        and u.userRole = #{userRole} and u.userRole = r.id
    select>

5、向数据库添加信息

 // UserMapper.java
    public interface UserMapper {
        public int addUser(User user);
    }
 // UserMapper.xml
    
    
        insert into smbms_user
        (userCode,userName,userPassword,gender,birthday,phone,
        address,userRole,createdBy,creationDate)
        values (#{userCode}, #{userName}, #{userPassword},#{gender},#{birthday},
        #{phone},#{address},#{userRole},#{createdBy},#{creationDate})
    

6、更新数据库信息1

 // UserMapper.java
    public interface UserMapper {
        public int modify(User user);
    }
 // UserMapper.xml
    
    
        update smbms_user set
        userCode=#{userCode},userName=#{userName},userPassword=#{userPassword},
        gender=#{gender},birthday=#{birthday},phone=#{phone},address=#{address},
        userRole=#{userRole},modifyBy=#{modifyBy},modifyDate=#{modifyDate}
        where id = #{id}
       

7、更新数据库信息2

    // UserMapper.java
    public interface UserMapper {
        public int updatePwd(@Param("id")Integer id, @Param("userPassword")String pwd);
    }

    // UserMapper.xml
    
    "updatePwd">
        update smbms_user set userPassword=#{userPassword} where id = #{id}
    

8、删除数据

    // UserMapper.java
    public interface UserMapper {
        public int deleteUserById(@Param("id")Integer delId);
    }

    // UserMapper.xml
    
    "deleteUserById">
        delete from smbms_user where id = #{id} 
    

9、resultMap > association 使用

    // UserMapper.java
    public interface UserMapper {
        public List getUserListByRoleId(@Param("userRole")Integer roleId);
    }


    // User.java
    public class User {
        // association
        private Role role; // 用户角色

        public Role getRole() {
            return role;
        }

        public void setRole(Role role) {
            this.role = role;
        }
        // association
    }

    // Role.java
    public class Role {
        private Integer id; // id
        private String roleCode; // 角色编码
        private String roleName; // 角色名称
        ...
        //get{} set{}
    }

    // UserMapper.xml
    
    "User" id="userRoleList">
        "id" column="id" />
        "userCode" column="userCode" />
        "userName" column="userName" />
        "userRole" column="userRole" />
        
        "role" javaType="Role">
            "id" column="r_id" />
            "roleCode" column="roleCode" />
            "roleName" column="roleName" />
        
    

    <select id="getUserListByRoleId" parameterType="Integer"
        resultMap="userRoleList">
        select u.*,r.id as r_id,r.roleCode, r.roleName 
        from smbms_user u,smbms_role r
        where u.userRole=#{userRole} 
        and u.userRole = r.id
    select>
    

10、resultMap > association使用2 (在第9步的基础上修改)

    // UserMapper.java
    public interface UserMapper {
        public List<User> getUserListByRoleId2(@Param("userRole")Integer roleId);
    }


    // UserMapper.xml
    
    <resultMap type="User" id="userRoleList2">
        <id property="id" column="id" />
        <result property="userCode" column="userCode" />
        <result property="userName" column="userName" />
        <result property="userRole" column="userRole" />
        <association property="role" javaType="Role" resultMap="roleResult" />
    resultMap>

    <resultMap type="Role" id="roleResult">
        <id property="id" column="r_id" />
        <result property="roleCode" column="roleCode" />
        <result property="roleName" column="roleName" />
    resultMap>

    <select id="getUserListByRoleId2" parameterType="Integer" resultMap="userRoleList2">
        select u.*,r.id as r_id,r.roleCode, r.roleName
        from smbms_user u,smbms_role r
        where u.userRole=#{userRole}
        and u.userRole = r.id
    select>
    

11、resultMap > collection使用1

    // UserMapper.java
    public interface UserMapper {
        public List<User> getAddressListByUserId(@Param("id")Integer userId);
    }

    // User.java
    public class User {
        // collection
        private List<Address> addressList;

        public List<Address> getAddressList() {
            return addressList;
        }

        public void setAddressList(List<Address> addressList) {
            this.addressList = addressList;
        }
        // collection
    }

    // Role.java
    public class Address {
        ...
        //get{} set{}
    }

    // UserMapper.xml
    
    <resultMap type="User" id="userAddressList">
        <id property="id" column="id" />
        <result property="userCode" column="userCode" />
        <result property="userName" column="userName" />
        
        <collection property="addressList" ofType="Address">
            <id property="id" column="a_id" />
            <result property="postCode" column="postCode" />
            <result property="tel" column="tel" />
            <result property="contact" column="contact" />
            <result property="addressDesc" column="addressDesc" />
        collection>
    resultMap>

    <select id="getAddressListByUserId" parameterType="Integer" resultMap="userAddressList">
        select u.*, a.id as a_id, a.contact, a.addressDesc, a.tel, a.postCode
        from smbms_user u, smbms_address a
        where u.id=a.userId and u.id=#{id}
    select>
    

12、resultMap > collection使用2 (在第11步的基础上修改)

    // UserMapper.java
    public interface UserMapper {
        public List<User> getAddressListByUserId2(@Param("id")Integer userId);
    }

    // UserMapper.xml
    
    <resultMap type="User" id="userAddressList2">
        <id property="id" column="id" />
        <result property="userCode" column="userCode" />
        <result property="userName" column="userName" />
        
        <collection property="addressList" ofType="Address" resultMap="addressResult"/>
    resultMap>

    <resultMap type="Address" id="addressResult">
        <id property="id" column="a_id" />
        <result property="postCode" column="postCode" />
        <result property="tel" column="tel" />
        <result property="contact" column="contact" />
        <result property="addressDesc" column="addressDesc" />
    resultMap>

    <select id="getAddressListByUserId2" parameterType="Integer" resultMap="userAddressList2">
        select u.*, a.id as a_id, a.contact, a.addressDesc, a.tel, a.postCode
        from smbms_user u, smbms_address a
        where u.id=a.userId and u.id=#{id}
    select>
    

13、resultMap自动映射的匹配 级别

    // mybatis-config.xml
    <settings>
        <setting name="logImpl" value="LOG4J"/>
        
        
        
        
    settings>

@Author 瞌睡虫
@mybatis-3.2.2
@Database: mysql 5.7.15
@Tool: MyEclipse