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基于Java 利用Mybatis实现oracle批量插入及分页查询

2022-07-01 16:52:29 来源:易采站长站 作者:

目录
1、单条数据insert2、批量数据批量insert3、创建序列4、oracle分页查询前端与后端交互,分页查询后端海量数据导出,批量查询

1、单条数据insert

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

<!--Mybatis写法1,有序列,主键是自增ID,主键是序列-->
<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写法2,无序列,主键是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、批量数据批量insert

insert>

<!--简单SQL, 方法1-->
INSERT ALL 
INTO userinfo (USERID, USERNAME, AGE) values(1001,'小明',20)
INTO userinfo (USERID, USERNAME, AGE) values(1002,'小红',18)
INTO userinfo (USERID, USERNAME, AGE) values(1003,'张三',23)
select 3 from dual;
<!--简单SQL, 方法2-->
begin
    insert into userinfo (USERID, USERNAME, AGE) values(1001,'小明',20);
    insert into userinfo (USERID, USERNAME, AGE) values(1001,'小红',18);
    insert into userinfo (USERID, USERNAME, AGE) values(1001,'张三',23);
end;
<!--简单SQL, 方法3-->
insert into userinfo (USERID, USERNAME, AGE) 
select 1001, '小明', 20 from dual union all
select 1002, '小红', 18 from dual union all
select 1003, '张三', 23 from dual
<!--Mybatis写法1,无序列-->
<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写法2,无序列-->
<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) -->
        
        <!-- 上面带括号,下面不带括号,都可以,少量数据不带括号效率高 -->
        select #{item.userid}, #{item.username}, #{item.age} from dual
    </foreach>
</insert>    
<!--Mybatis写法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、创建序列

    minvalue>maxvalue n (/nomaxvalue):最大值为nstart with n:从n开始计数increment by n:每次增加ncache n (/nocache):缓存n个sequence值 / 不缓存,如果缓存,则会有跳号的危险noorder (/order):不保证序列号按顺序生成请求cycle n (/nocycle):如果到达最大值n后,再次从start with n开始currval:序列的当前值,新序列必须使用一次nextval 才能获取到值,否则会报错nextval:表示序列的下一个值。新序列首次使用时获取的是该序列的初始值,从第二次使用时开始按照设置的步进递增

    删除序列语法: drop sequence seq_表名

    <!--
    create sequence 序列名     
           increment by 1 	--每次增加几个,我这里是每次增加1
           start with 1   	--从1开始计数
           nomaxvalue      	--不设置最大值
           nocycle         	--一直累加,不循环
           nocache;        	--不建缓冲区
    在插入语句中调用:序列名.nextval  生成自增主键。
    -->
    <!--创建序列-->
    create sequence SEQ_USERINFO
    minvalue 1
    maxvalue 9999999999
    start with 1
    increment by 1
    nocache;
    
    <!--删除序列-->
    drop sequence SEQ_USERINFO

    4、oracle分页查询

    前端与后端交互,分页查询

    service业务实现:

    public List<TBadUserW> queryPageBadUserInfo(TbadUserQuery queryModel) {
        log.info("分页查询请求参数,{}", JSON.toJSONString(queryModel));
        int pageNum = queryModel.getPageNum(); // 开始页
        int pageSize = queryModel.getPageSize(); // 每页数量
        queryModel.setStart((pageNum - 1) * pageSize); // 开始行数 (+1后)
        queryModel.setEnd(pageNum * pageSize); // 结束行数
        List<TBadUserW> beans = badUserWDao.queryPageBadUserInfo(queryModel);
        log.info("最终查询数量:", beans.size());
        return beans;
    }

    mapper.xml文件:

    <select id="queryPageInfo" parameterType="com.zznode.test.bean.TbadUserQuery"
            resultMap="BaseResultMap" >
        SELECT tt.*	FROM
        (
        	<!--前端分页需要 total总记录-->
            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>

    后端海量数据导出,批量查询

    service业务实现:

    public List<TBadUserW> queryPageBadUserInfo(TbadUserQuery queryModel) {
        log.info("分页查询请求参数,{}", JSON.toJSONString(queryModel));
        List<TBadUserW> result = new ArrayList<>();
        int pageNum = queryModel.getPageNum(); // 开始页
        int pageSize = queryModel.getPageSize(); // 每页数量(可以每页设置为200/500/1000),每次查询的条数
        boolean searchAll = true;
        while (searchAll){
            queryModel.setStart((pageNum - 1) * pageSize); // 开始行数 (+1后)
            queryModel.setEnd(pageNum * pageSize); // 结束行数
            List<TBadUserW> beans = badUserWDao.queryPageBadUserInfo(queryModel);
            if (null == beans || beans.size() < pageSize) {
                searchAll = false;
            }
            if (CollectionUtils.isNotEmpty(beans)) {
                result.addAll(beans);
            }
            pageNum++;
        }
        log.info("最终查询数量:", result.size());
        return result;
    }

    mapper.xml文件编写

    <!--这种写法是比较高效的分批查询方法,分批不需要查询total总量,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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