基於Java 利用Mybatis實現oracle批量插入及分頁查詢

1、單條數據insert

<!--簡單SQL-->
insert into userinfo (USERID, USERNAME, AGE) values(1001,'小明',20);

<!--Mybatis寫法1,有序列,主鍵是自增ID,主鍵是序列-->
<insert id="insert" parameterType="com.zznode.modules.bean.UserInfo">
    <selectKey resultType="java.lang.Integer" order="BEFORE" keyProperty="userid">
      SELECT userinfo_userid_seq.nextval as userid from dual
    </selectKey>
    insert into EPG_ALARM_INFO (USERID, USERNAME, AGE)
    values (#{userid}, #{username}, #{age})
</insert>

<!--Mybatis寫法2,無序列,主鍵是uuid,字符串-->
<insert id="insert" parameterType="com.zznode.modules.bean.UserInfo">
    insert into EPG_ALARM_INFO (USERID, USERNAME, AGE, TIME)
    values (#{userid}, #{username}, #{age}, sysdate)
</insert>

2、批量數據批量insert

insert all into 的方式返回值由最後的select 決定:

<!--簡單SQL, 方法1-->
INSERT ALL 
INTO userinfo (USERID, USERNAME, AGE) values(1001,'小明',20)
INTO userinfo (USERID, USERNAME, AGE) values(1002,'小紅',18)
INTO userinfo (USERID, USERNAME, AGE) values(1003,'張三',23)
select 3 from dual;
<!--簡單SQL, 方法2-->
begin
    insert into userinfo (USERID, USERNAME, AGE) values(1001,'小明',20);
    insert into userinfo (USERID, USERNAME, AGE) values(1001,'小紅',18);
    insert into userinfo (USERID, USERNAME, AGE) values(1001,'張三',23);
end;
<!--簡單SQL, 方法3-->
insert into userinfo (USERID, USERNAME, AGE) 
select 1001, '小明', 20 from dual union all
select 1002, '小紅', 18 from dual union all
select 1003, '張三', 23 from dual
<!--Mybatis寫法1,無序列-->
<insert id="insertBatch" parameterType="java.util.List">
    INSERT ALL 
    <foreach collection="list" index="index" item="item">
        INTO userinfo (USERID, USERNAME, AGE)
        VALUES (#{item.userid}, #{item.username}, #{item.age})
    </foreach>
    select list.size from dual
</insert>
<!--Mybatis寫法2,無序列-->
<insert id="insertBatch">
    insert into EPG_ALARM_INFO (USERID, USERNAME, AGE)
    <foreach collection="list" item="item" index="index" separator="union all">
        <!-- <foreach collection="list" item="item" index="index" separator="union all" open="(" close=")"> -->
        <!-- (select #{item.userid}, #{item.username}, #{item.age} from dual) -->
        
        <!-- 上面帶括號,下面不帶括號,都可以,少量數據不帶括號效率高 -->
        select #{item.userid}, #{item.username}, #{item.age} from dual
    </foreach>
</insert>    
<!--Mybatis寫法3,有序列-->
<insert id="insertBatch">
    insert into EPG_ALARM_INFO (USERID, USERNAME, AGE)
    SELECT userinfo_userid_seq.nextval, m.* FROM (
    <foreach collection="list" item="item" index="index" separator="union all">
        select #{item.username}, #{item.age} from dual
    </foreach>
    ) m
</insert> 

3、創建序列

  • minvalue n (/nominvalue):最小值為n
  • maxvalue n (/nomaxvalue):最大值為n
  • start with n:從n開始計數
  • increment by n:每次增加n
  • cache n (/nocache):緩存n個sequence值 / 不緩存,如果緩存,則會有跳號的危險
  • noorder (/order):不保證序列號按順序生成請求
  • cycle n (/nocycle):如果到達最大值n後,再次從start with n開始
  • currval:序列的當前值,新序列必須使用一次nextval 才能獲取到值,否則會報錯
  • nextval:表示序列的下一個值。新序列首次使用時獲取的是該序列的初始值,從第二次使用時開始按照設置的步進遞增

刪除序列語法: drop sequence seq_表名

<!--
create sequence 序列名     
       increment by 1 	--每次增加幾個,我這裡是每次增加1
       start with 1   	--從1開始計數
       nomaxvalue      	--不設置最大值
       nocycle         	--一直累加,不循環
       nocache;        	--不建緩沖區
在插入語句中調用:序列名.nextval  生成自增主鍵。
-->
<!--創建序列-->
create sequence SEQ_USERINFO
minvalue 1
maxvalue 9999999999
start with 1
increment by 1
nocache;

<!--刪除序列-->
drop sequence SEQ_USERINFO

4、oracle分頁查詢

前端與後端交互,分頁查詢

service業務實現:

public List<TBadUserW> queryPageBadUserInfo(TbadUserQuery queryModel) {
    log.info("分頁查詢請求參數,{}", JSON.toJSONString(queryModel));
    int pageNum = queryModel.getPageNum(); // 開始頁
    int pageSize = queryModel.getPageSize(); // 每頁數量
    queryModel.setStart((pageNum - 1) * pageSize); // 開始行數 (+1後)
    queryModel.setEnd(pageNum * pageSize); // 結束行數
    List<TBadUserW> beans = badUserWDao.queryPageBadUserInfo(queryModel);
    log.info("最終查詢數量:", beans.size());
    return beans;
}

mapper.xml文件:

<select id="queryPageInfo" parameterType="com.zznode.test.bean.TbadUserQuery"
        resultMap="BaseResultMap" >
    SELECT tt.*	FROM
    (
    	<!--前端分頁需要 total總記錄-->
        SELECT t.*, ROWNUM rown, COUNT (*) OVER () total FROM
        (
            select <include refid="Base_Column_List"/> from T_BAD_USER_W
            <where>
                <if test="city != null and city !=''">
                    and city = #{city}
                </if>
                <if test="county != null and county != ''">
                    and county = #{county}
                </if>
                <if test="startTime != null and startTime !=''">
                    and loadtime >= to_date(#{startTime} , 'yyyy-mm-dd hh24:mi:ss')
                </if>
                <if test="endTime != null and endTime !=''">
                    and loadtime <![CDATA[<=]]> to_date(#{endTime} , 'yyyy-mm-dd hh24:mi:ss')
                </if>
            </where>
        )t
    )tt
    where tt.rown > #{start} and tt.rown <![CDATA[<=]]> #{end}
</select>

後端海量數據導出,批量查詢

service業務實現:

public List<TBadUserW> queryPageBadUserInfo(TbadUserQuery queryModel) {
    log.info("分頁查詢請求參數,{}", JSON.toJSONString(queryModel));
    List<TBadUserW> result = new ArrayList<>();
    int pageNum = queryModel.getPageNum(); // 開始頁
    int pageSize = queryModel.getPageSize(); // 每頁數量(可以每頁設置為200/500/1000),每次查詢的條數
    boolean searchAll = true;
    while (searchAll){
        queryModel.setStart((pageNum - 1) * pageSize); // 開始行數 (+1後)
        queryModel.setEnd(pageNum * pageSize); // 結束行數
        List<TBadUserW> beans = badUserWDao.queryPageBadUserInfo(queryModel);
        if (null == beans || beans.size() < pageSize) {
            searchAll = false;
        }
        if (CollectionUtils.isNotEmpty(beans)) {
            result.addAll(beans);
        }
        pageNum++;
    }
    log.info("最終查詢數量:", result.size());
    return result;
}

mapper.xml文件編寫

<!--這種寫法是比較高效的分批查詢方法,分批不需要查詢total總量,不支持total-->
<select id="queryPageInfo" parameterType="com.zznode.test.bean.TbadUserQuery"
        resultMap="BaseResultMap" >
    SELECT tt.*	FROM
    (
        SELECT t.*, ROWNUM rown FROM
        (
            select <include refid="Base_Column_List"/> from T_BAD_USER_W
            <where>
                <if test="city != null and city !=''">
                    and city = #{city}
                </if>
                <if test="county != null and county != ''">
                    and county = #{county}
                </if>
                <if test="startTime != null and startTime !=''">
                    and loadtime >= to_date(#{startTime} , 'yyyy-mm-dd hh24:mi:ss')
                </if>
                <if test="endTime != null and endTime !=''">
                    and loadtime <![CDATA[<=]]> to_date(#{endTime} , 'yyyy-mm-dd hh24:mi:ss')
                </if>
            </where>
        )t where ROWNUM <![CDATA[<=]]> #{end}
    )tt
    where tt.rown > #{start}
</select>

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