myBatis --(3)数据的增删改查
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">
select
h.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 addTime
FROM
T_USER_JOB_FOCUS h
LEFT JOIN
T_JOB j
on
j.JOB_ID=h.JOB_ID
LEFT JOIN
T_ENTERPRISE e
on
e.ENTERPRISE_ID = j.ENTERPRISE_ID
LEFT JOIN
T_WORK_YEARS w
on
w.WORK_YEARS_ID = j.WORK_YEARS_ID
LEFT JOIN T_LOCATION
tt
on
tt.LOCATION_ID = j.LOCATION_ID
where
h.USER_ID=#{uesrId}
<if test="lastTime != null">
and h.ADD_TIME
<=#{lastTime}
</if>
order by h.ADD_TIME desc
limit 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)
FROM
t_user_enterprise_oper tueo
WHERE
tueo.ENTERPRISE_ID = #{objectId}
AND
tueo.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">
SELECT
tj.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 flag
FROM
t_job
tj,t_location tl,t_enterprise te,t_hr th,t_work_years
twy,t_job_category tjc
WHERE tj.LOCATION_ID = tl.LOCATION_ID
AND
tl.LOCATION_LEVEL = 2
AND tl.USE_FLAG = 1
AND tj.ENTERPRISE_ID =
te.ENTERPRISE_ID
AND te.USE_FLAG = 1
AND tj.HR_ID = th.HR_ID
AND
th.USE_FLAG = 1
AND tj.WORK_YEARS_ID = twy.WORK_YEARS_ID
AND
tj.JOB_CATEGORY_ID = tjc.JOB_CATEGORY_ID
AND tjc.USE_FLAG = 1
<if test="jobCategoryId != null">
AND
tjc.JOB_CATEGORY_ID =
#{jobCategoryId}
</if>
<if test="locationId != null">
AND
tl.LOCATION_ID = #{locationId}
</if>
<if test="workYearId != null">
AND
twy.WORK_YEARS_ID = #{workYearId}
</if>
<if test="enterpriseId != null">
AND
tj.ENTERPRISE_ID = #{enterpriseId}
</if>
<if test="hrId != null">
AND
tj.HR_ID = #{hrId}
</if>
<if test="searchStr != null">
AND
tj.JOB_NAME LIKE concat(concat('%',#{searchStr}),'%')
</if>
<if test="lastTime != null">
AND
tj.ADD_TIME <= #{lastTime}
</if>
GROUP BY tj.JOB_ID
ORDER BY
tj.ADD_TIME DESC
LIMIT #{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 {
//bean
private 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_job
set
JOB_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_job
where 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。