上一篇文章《接口方式编程》中讲述的是返回单个对象(包括对象、整型、字符串)等等，这篇文章讲述的是返回一个list。

查询单个对象的返回可以采用resultType，例如

1>返回是一个对象的，这个时候，数据库查询到的数据：字段命名别名的时候要和接收对象中的属性名称要一一对应起来，否则会出现数据库查询得到数据，但是显示出来的却为null的现象。

    <select id="getJobFocus" resultType="com.zhiji.caren.VO.JobFocus">selecth.JOB_ID as jobId,j.JOB_NAME as jobName,j.ENTERPRISE_ID as enterpriseId,j.SALARY_MIN as salaryMin,j.SALARY_MAX as salaryMax,j.WORK_YEARS_ID as workYearsId,j.LOCATION_ID as locationId,tt.LOCATION_NAME as locationName,e.ENTERPRISE_NAME as enterpriseName,e.ENTERPRISE_LOGO as enterpriseLogo,j.NEGOTIABLE_FLAG as negotiableFlag,w.WORK_YEARS_INFO as workYearsInfo,h.ADD_TIME as addTimeFROMT_USER_JOB_FOCUS hLEFT JOINT_JOB jonj.JOB_ID=h.JOB_IDLEFT JOINT_ENTERPRISE eone.ENTERPRISE_ID = j.ENTERPRISE_IDLEFT JOINT_WORK_YEARS wonw.WORK_YEARS_ID = j.WORK_YEARS_IDLEFT JOIN T_LOCATIONttontt.LOCATION_ID = j.LOCATION_IDwhereh.USER_ID=#{uesrId}<if test="lastTime != null">and h.ADD_TIME&lt;=#{lastTime}</if>order by h.ADD_TIME desclimit 0,#{pageIndex}</select>返回对象为public class JobFocus {/** 职位id */private String jobId;/** 职位名称 */private String jobName;/** 企业id */private String enterpriseId;/** 企业名称 */private String enterpriseName;/** 企业LogoURL */private String enterpriseLogo;/** 薪资类别 */private String negotiableFlag;/** 薪水最小值 */private String salaryMin;/** 薪水最大值 */private String salaryMax;/** 工作地点id */private String locationId;/** 工作地点名称 */private String locationName;/** 工作经验id */private String workYearsId;/** 工作经验信息 */private String workYearsInfo;/** 添加时间*/private String addTime;//此处省略属性的get与set方法}

2>返回是String类型的

    <select id="getJobTypeUpdTime" resultType="java.lang.String">SELECT MAX(UPD_TIME) FROM T_JOB_TYPE limit 0,1</select>

3>返回是整型类型的

    <select id="selectOprNum" resultType="java.lang.Integer">SELECT COUNT(1)FROMt_user_enterprise_oper tueoWHEREtueo.ENTERPRISE_ID = #{objectId}ANDtueo.OPER_TYPE = #{type}</select>

一、这篇讲述的是返回的是一个list，用resultMap方式来接收转换

接收的resultMap

    <resultMap id="BaseResultMapJobList" type="com.zhiji.caren.VO.JobList"><result column="JOB_ID" jdbcType="NUMERIC" property="jobId" /><result column="JOB_NAME" jdbcType="VARCHAR" property="jobName" /><result column="ENTERPRISE_ID" jdbcType="NUMERIC" property="enterpriseId" /><result column="ENTERPRISE_NAME" jdbcType="VARCHAR" property="enterpriseName" /><result column="ENTERPRISE_LOGO" jdbcType="VARCHAR" property="enterpriseLogo" /><result column="NEGOTIABLE_FLAG" jdbcType="NUMERIC" property="negotiableFlag" /><result column="SALARY_MIN" jdbcType="NUMERIC" property="salaryMin" /><result column="SALARY_MAX" jdbcType="NUMERIC" property="salaryMax" /><result column="LOCATION_ID" jdbcType="NUMERIC" property="locationId" /><result column="LOCATION_NAME" jdbcType="VARCHAR" property="locationName" /><result column="WORK_YEARS_ID" jdbcType="NUMERIC" property="workYearsId" /><result column="WORK_YEARS_INFO" jdbcType="VARCHAR" property="workYearsInfo" /><result column="ADD_TIME" jdbcType="VARCHAR" property="addTime" /><result column="flag" jdbcType="VARCHAR" property="flag" /></resultMap>

查询的SQL语句

    <select id="getJobListInfo" parameterType="com.zhiji.caren.VO.JobParams"resultMap="BaseResultMapJobList">SELECTtj.JOB_ID,tj.LOCATION_ID,tl.LOCATION_NAME,tj.JOB_NAME,tj.NEGOTIABLE_FLAG,tj.SALARY_MAX,tj.SALARY_MIN,tj.ADD_TIME,tj.ENTERPRISE_ID,te.ENTERPRISE_NAME,te.ENTERPRISE_LOGO,twy.WORK_YEARS_ID,twy.WORK_YEARS_INFO,'' AS flagFROMt_jobtj,t_location tl,t_enterprise te,t_hr th,t_work_yearstwy,t_job_category tjcWHERE tj.LOCATION_ID = tl.LOCATION_IDANDtl.LOCATION_LEVEL = 2AND tl.USE_FLAG = 1AND tj.ENTERPRISE_ID =te.ENTERPRISE_IDAND te.USE_FLAG = 1AND tj.HR_ID = th.HR_IDANDth.USE_FLAG = 1AND tj.WORK_YEARS_ID = twy.WORK_YEARS_IDANDtj.JOB_CATEGORY_ID = tjc.JOB_CATEGORY_IDAND tjc.USE_FLAG = 1<if test="jobCategoryId != null">ANDtjc.JOB_CATEGORY_ID =#{jobCategoryId}</if><if test="locationId != null">ANDtl.LOCATION_ID = #{locationId}</if><if test="workYearId != null">ANDtwy.WORK_YEARS_ID = #{workYearId}</if><if test="enterpriseId != null">ANDtj.ENTERPRISE_ID = #{enterpriseId}</if><if test="hrId != null">ANDtj.HR_ID = #{hrId}</if><if test="searchStr != null">ANDtj.JOB_NAME LIKE concat(concat('%',#{searchStr}),'%')</if><if test="lastTime != null">ANDtj.ADD_TIME &lt;= #{lastTime}</if>GROUP BY tj.JOB_IDORDER BYtj.ADD_TIME DESCLIMIT #{pageIndex}</select>

接口层

    /*** 获取工作列表* * @param job*            参数* @return 工作列表*/List<JobList> getJobListInfo(JobParams job);

bean层

public class JobParams {//beanprivate Integer jobCategoryId;private Integer locationId;private Integer salaryId;private Integer workYearId;private Integer pageIndex;private String  lastTime;private String  searchStr;private Integer enterpriseId;private Integer hrId;//此处省略set和get方法}

二、插入

    <insert id="insert" parameterType="com.zhiji.caren.model.Job" useGeneratedKeys="true" keyProperty="job_id" >insert into t_job (JOB_NAME, JOB_TYPE_ID,JOB_DEPARTMENT, ENTERPRISE_ID, JOB_CATEGORY_ID,SALARY_MIN, SALARY_MAX, LOCATION_ID,HR_ID, WORK_YEARS_ID,EDU_REQUIREMENT_ID,JOB_DESCRIPTION, JOB_ADDRESS, AUDIT_FLAG,STIKY_FLAG, NEGOTIABLE_FLAG, HR_INFO_FLAG,USE_FLAG, VALID_TIME,UPD_USER_ID,ADD_TIME, UPD_TIME)values (#{jobName,jdbcType=VARCHAR},#{jobTypeId,jdbcType=INTEGER},#{jobDepartment,jdbcType=VARCHAR}, #{enterpriseId,jdbcType=INTEGER},#{jobCategoryId,jdbcType=INTEGER},#{salaryMin,jdbcType=INTEGER},#{salaryMax,jdbcType=INTEGER},#{locationId,jdbcType=INTEGER},#{hrId,jdbcType=INTEGER}, #{workYearsId,jdbcType=INTEGER},#{eduRequirementId,jdbcType=INTEGER},#{jobDescription,jdbcType=VARCHAR}, #{jobAddress,jdbcType=VARCHAR},#{auditFlag,jdbcType=CHAR},#{stikyFlag,jdbcType=INTEGER},#{negotiableFlag,jdbcType=INTEGER}, #{hrInfoFlag,jdbcType=INTEGER},#{useFlag,jdbcType=INTEGER}, #{validTime,jdbcType=CHAR},#{updUserId,jdbcType=INTEGER},#{addTime,jdbcType=CHAR},#{updTime,jdbcType=CHAR})</insert>

注意：这里插入语句中没有带上job_id，因为在这里设置了主键自增长

<insert id="insert" parameterType="com.zhiji.caren.model.Job" useGeneratedKeys="true" keyProperty="job_id" >

同时还要求，将该表的job_id字段设置为自增长。

三、更新

    <update id="updateByPrimaryKey" parameterType="com.zhiji.caren.model.Job">update t_jobsetJOB_NAME = #{jobName,jdbcType=VARCHAR},JOB_TYPE_ID =#{jobTypeId,jdbcType=INTEGER},JOB_DEPARTMENT =#{jobDepartment,jdbcType=VARCHAR},ENTERPRISE_ID =#{enterpriseId,jdbcType=INTEGER},JOB_CATEGORY_ID =#{jobCategoryId,jdbcType=INTEGER},SALARY_MIN =#{salaryMin,jdbcType=INTEGER},SALARY_MAX =#{salaryMax,jdbcType=INTEGER},LOCATION_ID =#{locationId,jdbcType=INTEGER},HR_ID = #{hrId,jdbcType=INTEGER},WORK_YEARS_ID = #{workYearsId,jdbcType=INTEGER},EDU_REQUIREMENT_ID =#{eduRequirementId,jdbcType=INTEGER},JOB_DESCRIPTION =#{jobDescription,jdbcType=VARCHAR},JOB_ADDRESS =#{jobAddress,jdbcType=VARCHAR},AUDIT_FLAG =#{auditFlag,jdbcType=CHAR},STIKY_FLAG = #{stikyFlag,jdbcType=INTEGER},NEGOTIABLE_FLAG = #{negotiableFlag,jdbcType=INTEGER},HR_INFO_FLAG =#{hrInfoFlag,jdbcType=INTEGER},USE_FLAG = #{useFlag,jdbcType=INTEGER},VALID_TIME = #{validTime,jdbcType=CHAR},UPD_USER_ID =#{updUserId,jdbcType=INTEGER},ADD_TIME = #{addTime,jdbcType=CHAR},UPD_TIME = #{updTime,jdbcType=CHAR}where JOB_ID =#{jobId,jdbcType=INTEGER}</update>

四、删除

    <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">delete from t_jobwhere JOB_ID = #{jobId,jdbcType=INTEGER}</delete>

查询、增加、修改和删除均讲完了，注意：后三个执行操作后，需要在接口实现层commit()，这个主要针对的是事务管理那一块，目前我配置的事务还没有起效果，原因还没找到，这里就不贴出实现层的代码了。上面讲述的内容可以满足单次的增加、修改和删除。