纪念我人生中第一个merge into语句

做按组织关系汇总功能时，当数据量特别大，或者汇总组织特别多时，运行效率特别低，于是使用了merge into语句。

代码如下：

public void updateInsertData(DataSet dsl, String mxnm, DataSet dsc, DataSet dsr, String faslnm, DataSet dyxjDs, String thisBbnm, String tabname, DataSet glDs,String flnm,String dyzzNm,int hzbbStat){
        //using后的sql
        String queryDataSql = queryData(dsl, mxnm, dsc, dsr, faslnm, dyxjDs, thisBbnm, tabname, glDs);


        StringBuffer updateInsertSql = new StringBuffer();
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss ");
        String createdTime = formatter.format(new Date());
        String lastmodifiedTime = formatter.format(new Date());
        String creator = GetBspInfo.getBspInfo().getUserId();
        updateInsertSql.append("MERGE INTO FCDATA_"+mxnm +" DA ");
        updateInsertSql.append("USING ("+queryDataSql + ") QU ");
        updateInsertSql.append("ON (");

        for (int y = 0; y < dsl.getCount(); y++) {
            String wdmc = (String) dsl.getRecord(y).get("FCYSYS_BS");
            if(!("ZZ".equals(wdmc))) {
                updateInsertSql.append("DA.FC_" + wdmc + "_NM = QU.FC_" + wdmc + "_NM AND ");
            }
        }

        updateInsertSql.append(" DA.FC_ZZ_NM='" +dyzzNm+"' )");
        updateInsertSql.append("WHEN MATCHED THEN ");
        updateInsertSql.append("UPDATE SET DA.FC_QJS = ROUND(QU.FC_QJS,QU.FCBZL_DECN),");
        updateInsertSql.append("DA.FC_LJS = ROUND(QU.FC_LJS,QU.FCBZL_DECN),DA.FC_NDS = ROUND(QU.FC_NDS,QU.FCBZL_DECN),");
        updateInsertSql.append("DA.FC_LJS_C = ROUND(QU.FC_LJS_C,QU.FCBZL_DECN),DA.FC_NDS_C = ROUND(QU.FC_NDS_C,QU.FCBZL_DECN),");
        updateInsertSql.append("DA.FC_QJS_C = ROUND(QU.FC_QJS_C,QU.FCBZL_DECN),DA.FC_NDS_1 = ROUND(QU.FC_NDS_1,QU.FCBZL_DECN),");
        updateInsertSql.append("DA.FC_LJS_1 = ROUND(QU.FC_LJS_1,QU.FCBZL_DECN),DA.FC_QJS_1 = ROUND(QU.FC_QJS_1,QU.FCBZL_DECN),");
        updateInsertSql.append("FC_SJLY='2',FC_HZLBNM='" + flnm + "',LASTMODIFIER='" + creator + "',LASTMODIFIEDTIME=");
        updateInsertSql.append("(select to_date('").append(lastmodifiedTime).append("','YYYY-MM-DD HH24:MI:SS')from dual) ");
        updateInsertSql.append("WHEN NOT MATCHED THEN INSERT(");
        updateInsertSql.append("FC_ZZ_NM,FC_MXNM,FC_DANM,FC_BBDY,FC_LCST,");
        for (int w = 0; w < dsl.getCount(); w++) {
            String wdmc = (String) dsl.getRecord(w).get("FCYSYS_BS");
            if (!("ZZ".equals(wdmc))) {
                updateInsertSql.append("FC_" + wdmc + "_NM,");
            }
        }
        updateInsertSql.append("FC_QJS,FC_NDS,FC_LJS,FC_QJS_C,FC_NDS_C,FC_LJS_C,FC_QJS_1,FC_NDS_1,FC_LJS_1,");
        updateInsertSql.append("FC_SJLY,FC_HZLBNM,CREATOR,LASTMODIFIER,CREATEDTIME,LASTMODIFIEDTIME) ");
        updateInsertSql.append(" VALUES( '" + dyzzNm + "','" + mxnm + "',substr(sys_guid(),0,4)||sys_guid(),'" + thisBbnm + "','");
        updateInsertSql.append(hzbbStat + "',");
        for (int w = 0; w < dsl.getCount(); w++) {
            String wdmc = (String) dsl.getRecord(w).get("FCYSYS_BS");
            if (!("ZZ".equals(wdmc))) {
                updateInsertSql.append("QU.FC_" + wdmc + "_NM,");
            }
        }

        updateInsertSql.append("ROUND(QU.FC_QJS,QU.FCBZL_DECN),ROUND(QU.FC_NDS,QU.FCBZL_DECN),ROUND(QU.FC_LJS,QU.FCBZL_DECN),");
        updateInsertSql.append("ROUND(QU.FC_QJS_C,QU.FCBZL_DECN),ROUND(QU.FC_NDS_C,QU.FCBZL_DECN),ROUND(QU.FC_LJS_C,QU.FCBZL_DECN),");
        updateInsertSql.append("ROUND(QU.FC_QJS_1,QU.FCBZL_DECN),ROUND(QU.FC_NDS_1,QU.FCBZL_DECN),ROUND(QU.FC_LJS_1,QU.FCBZL_DECN),'");
        updateInsertSql.append("2','" + flnm + "','");
        updateInsertSql.append(creator + "','" + creator + "',");
        updateInsertSql.append("(select to_date('").append(createdTime).append("','YYYY-MM-DD HH24:MI:SS')from dual),");
        updateInsertSql.append("(select to_date('").append(lastmodifiedTime).append("','YYYY-MM-DD HH24:MI:SS')from dual) )");

        this.executeUpdate(updateInsertSql.toString());
        /********************merge into结束！！！！*************************/
    }

public String queryData(DataSet dsl, String mxnm, DataSet dsc, DataSet dsr, String faslnm, DataSet dyxjDs, String thisBbnm, String tabname, DataSet glDs) {
        boolean ifzb = false;//数据列中是否存在指标这个维度
        for (int s = 0; s < dsc.getCount(); s++) {
            String sjmc = (String) dsc.getRecord(s).get("FCYSYS_BS");
            if (!("ZB".equals(sjmc))) {
                ifzb = false;
            } else {
                ifzb = true;
                break;
            }
        }

        //查询出下级组织报表的所有单元格数据，便于下面判断该数据是否在上级组织中有记录
        StringBuffer sqlh = new StringBuffer(200);
        sqlh.append(" SELECT FCBZL_DECN,");
        for (int w = 0; w < dsl.getCount(); w++) {
            String wdmc = (String) dsl.getRecord(w).get("FCYSYS_BS");
            if (!("ZZ".equals(wdmc))) {
                sqlh.append("FC_" + wdmc + "_NM,");
            }
        }
        if (ifzb) {
            sqlh.append(" CASE WHEN YSYSXM_XMXZ='2' OR YSYSXM_XMXZ='3' THEN MAX(FC_QJS)");
            sqlh.append(" ELSE SUM(NVL(FC_QJS, 0) * FCFLYS_BL) END AS FC_QJS, ");
            sqlh.append(" CASE WHEN YSYSXM_XMXZ='2' OR YSYSXM_XMXZ='3' THEN MAX(FC_NDS)");
            sqlh.append(" ELSE SUM(NVL(FC_NDS, 0) * FCFLYS_BL) END AS FC_NDS, ");
            sqlh.append(" CASE WHEN YSYSXM_XMXZ='2' OR YSYSXM_XMXZ='3' THEN MAX(FC_LJS)");
            sqlh.append(" ELSE SUM(NVL(FC_LJS, 0) * FCFLYS_BL) END AS FC_LJS, ");
            sqlh.append(" CASE WHEN YSYSXM_XMXZ='2' OR YSYSXM_XMXZ='3' THEN MAX(FC_QJS_C)");
            sqlh.append(" ELSE SUM(NVL(FC_QJS_C, 0) * FCFLYS_BL) END AS FC_QJS_C, ");
            sqlh.append(" CASE WHEN YSYSXM_XMXZ='2' OR YSYSXM_XMXZ='3' THEN MAX(FC_NDS_C)");
            sqlh.append(" ELSE SUM(NVL(FC_NDS_C, 0) * FCFLYS_BL) END AS FC_NDS_C, ");
            sqlh.append(" CASE WHEN YSYSXM_XMXZ='2' OR YSYSXM_XMXZ='3' THEN MAX(FC_LJS_C)");
            sqlh.append(" ELSE SUM(NVL(FC_LJS_C, 0) * FCFLYS_BL) END AS FC_LJS_C, ");
            sqlh.append(" CASE WHEN YSYSXM_XMXZ='2' OR YSYSXM_XMXZ='3' THEN MAX(FC_QJS_1)");
            sqlh.append(" ELSE SUM(NVL(FC_QJS_1, 0) * FCFLYS_BL) END AS FC_QJS_1, ");
            sqlh.append(" CASE WHEN YSYSXM_XMXZ='2' OR YSYSXM_XMXZ='3' THEN MAX(FC_NDS_1)");
            sqlh.append(" ELSE SUM(NVL(FC_NDS_1, 0) * FCFLYS_BL) END AS FC_NDS_1, ");
            sqlh.append(" CASE WHEN YSYSXM_XMXZ='2' OR YSYSXM_XMXZ='3' THEN MAX(FC_LJS_1)");
            sqlh.append(" ELSE SUM(NVL(FC_LJS_1, 0) * FCFLYS_BL) END AS FC_LJS_1");
        } else {
            sqlh.append("SUM(NVL(FC_QJS,0)*FCFLYS_BL) AS FC_QJS,SUM(NVL(FC_NDS,0)*FCFLYS_BL) AS FC_NDS,SUM(NVL(FC_LJS,0)*FCFLYS_BL) AS FC_LJS,");
            sqlh.append("SUM(NVL(FC_QJS_1,0)*FCFLYS_BL) AS FC_QJS_1,SUM(NVL(FC_NDS_1,0)*FCFLYS_BL) AS FC_NDS_1,");
            sqlh.append("SUM(NVL(FC_LJS_1,0)*FCFLYS_BL) AS FC_LJS_1,SUM(NVL(FC_QJS_C,0)*FCFLYS_BL) AS FC_QJS_C,SUM(NVL(FC_NDS_C,0)*FCFLYS_BL) AS FC_NDS_C,SUM(NVL(FC_LJS_C,0)*FCFLYS_BL) AS FC_LJS_C");
        }

        sqlh.append(" FROM FCDATA_" + mxnm);

                /*本来是join fcbzh,但是后来调整为只汇总固定行，而fcirow里存的都是固定行，所以改为join fcirow*/
        sqlh.append(" JOIN FCBZH_" + mxnm + " ON ");
        //sqlh.append(" JOIN FCIROW ON ");

        for (int x = 0; x < dsr.getCount(); x++) {
            String xxmc = (String) dsr.getRecord(x).get("FCYSYS_BS");
            if (!("ZZ".equals(xxmc))) {

                sqlh.append(" FC_" + xxmc + "_NM = FCBZH_" + xxmc + "NM AND ");
                //sqlh.append(" FC_" + xxmc + "_NM = FCIROW_" + xxmc + " AND ");

            }
        }
        sqlh.append(" FC_ZZ_NM = FCBZH_ZZNM AND ");
        sqlh.append(" 1=1 JOIN FCBZL_" + mxnm + " ON ");
        for (int s = 0; s < dsc.getCount(); s++) {
            String sjmc = (String) dsc.getRecord(s).get("FCYSYS_BS");
            if (!("ZB".equals(sjmc))) {
                sqlh.append(" FC_" + sjmc + "_NM = FCBZL_" + sjmc + " AND ");
            } else {
                sqlh.append(" FC_" + sjmc + "_NM = FCBZL_" + sjmc + " AND ");
            }
        }
        sqlh.append(" 1=1 ");
        //指标这个维度数据结构不同，单独处理
        if (ifzb) {
            sqlh.append(" JOIN YSYSXM ON YSYSXM_XMUID = FC_ZB_NM ");
        }
        sqlh.append(" JOIN " + tabname + " ON FCFLYS_SJNM = FC_ZZ_NM ");
        /*sqlh.append(" JOIN FCBBRW ON FCBBRW_ZZ=FC_ZZ_NM WHERE FC_BBDY = '" + thisBbnm + "' ");*/
        //两张表同一个模型内码，但有一个归口表
        sqlh.append(" JOIN FCBBRW ON FCBBRW_ZZ=FC_ZZ_NM AND FCBBRW_BBNM=FC_BBDY WHERE 1=1");
        /*sqlh.append(" JOIN FCBBRW ON FCBBRW_ZZ=FC_ZZ_NM WHERE 1=1");*/
        sqlh.append(" AND FCBZL_IFBL='0' AND FCBZH_SLNM='" + faslnm + "' AND FCBZL_SLNM='" + faslnm + "' AND FCBZL_DYNM='" + thisBbnm + "' AND FCBZH_DYNM='" + thisBbnm + "'");
        sqlh.append(" AND FCBBRW_SLNM='" + faslnm + "' AND FCBBRW_BBNM ='" + thisBbnm + "' ");
        if (glDs.getCount() > 2) {
            sqlh.append(" AND FCBBRW_IFGL='1' ");
        }
        sqlh.append(" AND FC_ZZ_NM IN (");
        //下级组织范围条件
        for (int zz = 0; zz < dyxjDs.getCount(); zz++) {
            String xjzznm = (String) dyxjDs.getRecord(zz).get("ZZNM");
            if (zz == dyxjDs.getCount() - 1) {
                sqlh.append("'" + xjzznm + "')");
            } else {
                sqlh.append("'" + xjzznm + "',");
            }
        }
        sqlh.append(" AND FCBZH_ZZNM IN (");
        //下级组织范围条件
        for (int zz = 0; zz < dyxjDs.getCount(); zz++) {
            String xjzznm = (String) dyxjDs.getRecord(zz).get("ZZNM");
            if (zz == dyxjDs.getCount() - 1) {
                sqlh.append("'" + xjzznm + "')");
            } else {
                sqlh.append("'" + xjzznm + "',");
            }
        }
        sqlh.append(" GROUP BY ");
        if (ifzb) {
            sqlh.append(" YSYSXM_XMXZ,");
        }
        for (int y = 0; y < dsl.getCount(); y++) {
            String wdmc = (String) dsl.getRecord(y).get("FCYSYS_BS");
            if (!("ZZ".equals(wdmc))) {
                sqlh.append("FC_" + wdmc + "_NM,");
            }
        }
        sqlh.append("FCBZL_DECN");
        return sqlh.toString();
    }

运行处的sql语句如下：

MERGE INTO FCDATA_XS04 DA
USING (SELECT FCBZL_DECN,
              FC_QYXM_NM,
              FC_MB_NM,
              FC_ZB_NM,
              FC_LX_NM,
              FC_QJ_NM,
              CASE
                WHEN YSYSXM_XMXZ = '2' OR YSYSXM_XMXZ = '3' THEN
                 MAX(FC_QJS)
                ELSE
                 SUM(NVL(FC_QJS, 0) * FCFLYS_BL)
              END AS FC_QJS,
              CASE
                WHEN YSYSXM_XMXZ = '2' OR YSYSXM_XMXZ = '3' THEN
                 MAX(FC_NDS)
                ELSE
                 SUM(NVL(FC_NDS, 0) * FCFLYS_BL)
              END AS FC_NDS,
              CASE
                WHEN YSYSXM_XMXZ = '2' OR YSYSXM_XMXZ = '3' THEN
                 MAX(FC_LJS)
                ELSE
                 SUM(NVL(FC_LJS, 0) * FCFLYS_BL)
              END AS FC_LJS,
              CASE
                WHEN YSYSXM_XMXZ = '2' OR YSYSXM_XMXZ = '3' THEN
                 MAX(FC_QJS_C)
                ELSE
                 SUM(NVL(FC_QJS_C, 0) * FCFLYS_BL)
              END AS FC_QJS_C,
              CASE
                WHEN YSYSXM_XMXZ = '2' OR YSYSXM_XMXZ = '3' THEN
                 MAX(FC_NDS_C)
                ELSE
                 SUM(NVL(FC_NDS_C, 0) * FCFLYS_BL)
              END AS FC_NDS_C,
              CASE
                WHEN YSYSXM_XMXZ = '2' OR YSYSXM_XMXZ = '3' THEN
                 MAX(FC_LJS_C)
                ELSE
                 SUM(NVL(FC_LJS_C, 0) * FCFLYS_BL)
              END AS FC_LJS_C,
              CASE
                WHEN YSYSXM_XMXZ = '2' OR YSYSXM_XMXZ = '3' THEN
                 MAX(FC_QJS_1)
                ELSE
                 SUM(NVL(FC_QJS_1, 0) * FCFLYS_BL)
              END AS FC_QJS_1,
              CASE
                WHEN YSYSXM_XMXZ = '2' OR YSYSXM_XMXZ = '3' THEN
                 MAX(FC_NDS_1)
                ELSE
                 SUM(NVL(FC_NDS_1, 0) * FCFLYS_BL)
              END AS FC_NDS_1,
              CASE
                WHEN YSYSXM_XMXZ = '2' OR YSYSXM_XMXZ = '3' THEN
                 MAX(FC_LJS_1)
                ELSE
                 SUM(NVL(FC_LJS_1, 0) * FCFLYS_BL)
              END AS FC_LJS_1
         FROM FCDATA_XS04
         JOIN FCBZH_XS04 ON FC_QYXM_NM = FCBZH_QYXMNM
                        AND FC_ZZ_NM = FCBZH_ZZNM
                        AND 1 = 1
         JOIN FCBZL_XS04 ON FC_MB_NM = FCBZL_MB
                        AND FC_QJ_NM = FCBZL_QJ
                        AND FC_ZB_NM = FCBZL_ZB
                        AND FC_LX_NM = FCBZL_LX
                        AND 1 = 1
         JOIN YSYSXM ON YSYSXM_XMUID = FC_ZB_NM
         JOIN FCFLYS_ZZHZ ON FCFLYS_SJNM = FC_ZZ_NM
         JOIN FCBBRW ON FCBBRW_ZZ = FC_ZZ_NM
                    AND FCBBRW_BBNM = FC_BBDY
        WHERE 1 = 1
          AND FCBZL_IFBL = '0'
          AND FCBZH_SLNM = 'f4f10134-ca32-4329-88fa-1e2e5ab5c47e'
          AND FCBZL_SLNM = 'f4f10134-ca32-4329-88fa-1e2e5ab5c47e'
          AND FCBZL_DYNM = '262ff333-8e40-47ec-8753-b18a4fac9331'
          AND FCBZH_DYNM = '262ff333-8e40-47ec-8753-b18a4fac9331'
          AND FCBBRW_SLNM = 'f4f10134-ca32-4329-88fa-1e2e5ab5c47e'
          AND FCBBRW_BBNM = '262ff333-8e40-47ec-8753-b18a4fac9331'
          AND FC_ZZ_NM IN ('a0f8f16c-fa4e-4bf5-bb74-d9b5f9ac8640',
               '1c42551c-3749-48ec-b2a5-7cdac85f3915')
          AND FCBZH_ZZNM IN ('a0f8f16c-fa4e-4bf5-bb74-d9b5f9ac8640',
               '1c42551c-3749-48ec-b2a5-7cdac85f3915')
        GROUP BY YSYSXM_XMXZ,
                 FC_QYXM_NM,
                 FC_MB_NM,
                 FC_ZB_NM,
                 FC_LX_NM,
                 FC_QJ_NM,
                 FCBZL_DECN) QU
ON (DA.FC_QYXM_NM = QU.FC_QYXM_NM AND DA.FC_MB_NM = QU.FC_MB_NM AND DA.FC_ZB_NM = QU.FC_ZB_NM AND DA.FC_LX_NM = QU.FC_LX_NM AND DA.FC_QJ_NM = QU.FC_QJ_NM AND DA.FC_ZZ_NM = 'f9b6a300-534c-49f0-9aca-63b5a4caf8d8')
WHEN MATCHED THEN
  UPDATE
     SET DA.FC_QJS        = ROUND(QU.FC_QJS, QU.FCBZL_DECN),
         DA.FC_LJS        = ROUND(QU.FC_LJS, QU.FCBZL_DECN),
         DA.FC_NDS        = ROUND(QU.FC_NDS, QU.FCBZL_DECN),
         DA.FC_LJS_C      = ROUND(QU.FC_LJS_C, QU.FCBZL_DECN),
         DA.FC_NDS_C      = ROUND(QU.FC_NDS_C, QU.FCBZL_DECN),
         DA.FC_QJS_C      = ROUND(QU.FC_QJS_C, QU.FCBZL_DECN),
         DA.FC_NDS_1      = ROUND(QU.FC_NDS_1, QU.FCBZL_DECN),
         DA.FC_LJS_1      = ROUND(QU.FC_LJS_1, QU.FCBZL_DECN),
         DA.FC_QJS_1      = ROUND(QU.FC_QJS_1, QU.FCBZL_DECN),
         FC_SJLY          = '2',
         FC_HZLBNM        = 'fc302219-8a8b-484a-a9ff-2292a19606e3',
         LASTMODIFIER     = 'LYX',
         LASTMODIFIEDTIME = (select to_date('2017-07-21 14:06:01 ',
                                            'YYYY-MM-DD HH24:MI:SS')
                               from dual)
WHEN NOT MATCHED THEN
  INSERT
    (FC_ZZ_NM,
     FC_MXNM,
     FC_DANM,
     FC_BBDY,
     FC_LCST,
     FC_QYXM_NM,
     FC_MB_NM,
     FC_ZB_NM,
     FC_LX_NM,
     FC_QJ_NM,
     FC_QJS,
     FC_NDS,
     FC_LJS,
     FC_QJS_C,
     FC_NDS_C,
     FC_LJS_C,
     FC_QJS_1,
     FC_NDS_1,
     FC_LJS_1,
     FC_SJLY,
     FC_HZLBNM,
     CREATOR,
     LASTMODIFIER,
     CREATEDTIME,
     LASTMODIFIEDTIME)
  VALUES
    ('f9b6a300-534c-49f0-9aca-63b5a4caf8d8',
     'XS04',
     substr(sys_guid(), 0, 4) || sys_guid(),
     '262ff333-8e40-47ec-8753-b18a4fac9331',
     '1',
     QU.FC_QYXM_NM,
     QU.FC_MB_NM,
     QU.FC_ZB_NM,
     QU.FC_LX_NM,
     QU.FC_QJ_NM,
     ROUND(QU.FC_QJS, QU.FCBZL_DECN),
     ROUND(QU.FC_NDS, QU.FCBZL_DECN),
     ROUND(QU.FC_LJS, QU.FCBZL_DECN),
     ROUND(QU.FC_QJS_C, QU.FCBZL_DECN),
     ROUND(QU.FC_NDS_C, QU.FCBZL_DECN),
     ROUND(QU.FC_LJS_C, QU.FCBZL_DECN),
     ROUND(QU.FC_QJS_1, QU.FCBZL_DECN),
     ROUND(QU.FC_NDS_1, QU.FCBZL_DECN),
     ROUND(QU.FC_LJS_1, QU.FCBZL_DECN),
     '2',
     'fc302219-8a8b-484a-a9ff-2292a19606e3',
     'LYX',
     'LYX',
     (select to_date('2017-07-21 14:06:01 ', 'YYYY-MM-DD HH24:MI:SS')
        from dual),
     (select to_date('2017-07-21 14:06:01 ', 'YYYY-MM-DD HH24:MI:SS')
        from dual))

其实merge into语句的语法概括起来如下：

MERGE INTO table_name t1
USING (table|view|sub_query) t2
ON (join condition)
WHEN MATCHED THEN
    UPDATE table_name
    SET col1 = col_val1, col2 = col_val2
WHEN NOT MATCHED THEN
    INSERT (column_list) VALUES (column_values);