BLOB、CLOB流类型的Update更新实例

由于表设计运用了BLOB流类型用来存储大文件数据，因此SQL书写中需要根据BLOB、CLOL类型的特性进行初始化，

运用EMPTY_BLOB(),EMPTY_CLOB()方法，如：

UPDATE SRE_MSTR
SET
  SRE_NBR = :SRE_NBR, SRE_DATE = :SRE_DATE, SRE_VEND = :SRE_VEND, SRE_TYPE = :SRE_TYPE, SRE_RMKS = :SRE_RMKS, SRE_FILENAME = :SRE_FILENAME, 
  SRE_FILE_TYPE = :SRE_FILE_TYPE, SRE_REALNAME = :SRE_REALNAME, SRE_AUD_DESC = :SRE_AUD_DESC, SRE_PUR = :SRE_PUR, SRE_PUR_BY = :SRE_PUR_BY, 
  SRE_PUR_DATE = :SRE_PUR_DATE, SRE_QC = :SRE_QC, SRE_QC_BY = :SRE_QC_BY, SRE_QC_DATE = :SRE_QC_DATE, SRE_ENG = :SRE_ENG, SRE_ENG_BY = :SRE_ENG_BY, 
  SRE_ENG_DATE = :SRE_ENG_DATE, SRE_COM_ASS = :SRE_COM_ASS, SRE_PUR1 = :SRE_PUR1, SRE_PUR1_BY = :SRE_PUR1_BY, SRE_PUR1_DATE = :SRE_PUR1_DATE, SRE_QC1 = :SRE_QC1, 
  SRE_QC1_BY = :SRE_QC1_BY, SRE_QC1_DATE = :SRE_QC1_DATE, SRE_ENG1 = :SRE_ENG1, SRE_ENG1_BY = :SRE_ENG1_BY, SRE_ENG1_DATE = :SRE_ENG1_DATE, SRE_SUP_SCO = :SRE_SUP_SCO, 
  SRE_SUP_TYPE = :SRE_SUP_TYPE, SRE_CON = :SRE_CON, SRE_APRV = :SRE_APRV, SRE_APRV_BY = :SRE_APRV_BY, SRE_APRV_DATE = :SRE_APRV_DATE, SRE_VAL = :SRE_VAL, 
  SRE_INVAL = :SRE_INVAL, SRE_INVAL_BY = :SRE_INVAL_BY, SRE_INVAL_DATE = :SRE_INVAL_DATE, SRE_SITE = :SRE_SITE, SRE_WF_STATUS = :SRE_WF_STATUS, SRE_PROG_CODE = :SRE_PROG_CODE, 
  SRE_DOC_CODE = :SRE_DOC_CODE, SRE_CRT_BY = :SRE_CRT_BY, SRE_CRT_DATE = :SRE_CRT_DATE, SRE_MOD_TIMES = :SRE_MOD_TIMES, SRE_MOD_BY = :SRE_MOD_BY, SRE_MOD_DATE = :SRE_MOD_DATE, 
  SRE_PST = :SRE_PST, SRE_PST_BY = :SRE_PST_BY, SRE_PST_DATE = :SRE_PST_DATE, SRE_CHAR1 = :SRE_CHAR1, SRE_CHAR2 = :SRE_CHAR2, SRE_CHAR3 = :SRE_CHAR3, SRE_CHAR4 = :SRE_CHAR4, 
  SRE_CHAR5 = :SRE_CHAR5, SRE_CHAR6 = :SRE_CHAR6, SRE_QTY1 = :SRE_QTY1, SRE_QTY2 = :SRE_QTY2,
  SRE_FILE = EMPTY_BLOB(),SRE_FILE1 = EMPTY_BLOB(),SRE_FILENAME1=:SRE_FILENAME1
WHERE
  SRE_NBR = :Old_SRE_NBR
RETURNING
  SRE_FILE,SRE_FILE1
INTO 
  :SRE_FILE,:SRE_FILE1；