Question

从表中选择BLOB（存储的JSON字符串）字段值时，我遇到原始变量长度太长的问题。

查询：

  select utl_raw.cast_to_varchar2(dbms_lob.substr(TRANSACTION_DATA)) from PS_ISA_INB_PAYLOAD_LOG;

这是我用来将JSON对象插入BLOB字段中的SP：

  create or replace PROCEDURE SDIX_TICK_LOG 
    (
      ORGANIZATIONNAME IN VARCHAR2 
    , TRANSACTION_TYPE IN VARCHAR2 
    , TRANSACTION_DATA IN BLOB 
    , TRANSACTION_STATUS IN VARCHAR2 
    ) AS 
     l_r   RAW(32767);

      l_blob        blob;
      l_clob        clob :='"ItemMasterTransfer":[{"ORACLE_UNIQUE_REC_ID":"123assd4434","CUSTOMER_ID":"PMC","ORGANIZATION_CODE":"BMftrdsM","ITEM":"696738","INVENTORY_ITEM_ID":"0000000000000000000000000000546","ORGANIZATION_ID":" ","SUBINVENTORY_CODE":"000000000000000000","LOCATOR_ID":" ","ISA_MATERIAL_GROUP":" ","TAX_GROUP":" ","CATEGORY_ID":"1956","NOUN":" ","MODIFIER":" ","MANUFACTURER_ID":" ","MFG_ITEM_ID":" ","UNIT_OF_MEASURE":"BOX","ITEM_TYPE":"P","STOCK_ENABLED_FLAG":"Y","INVENTORY_ITEM_STATUS_CODE":"A","LIST_PRICE_PER_UNIT":"0","FULL_LEAD_TIME":"0","MAX_MINMAX_QUANTITY":"10","MIN_MINMAX_QUANTITY":"10","SAFETY_LEVEL":"0","REPLENISH_TO_ORDER_FLAG":"N","UTILIZ_CD":"","CURRENCY_CD":"USD","DESCRIPTION":"","ATTRIBUTE1":" ","ATTRIBUTE2":" ","ATTRIBUTE3":" ","ATTRIBUTE4":" ","ATTRIBUTE5":" ","ATTRIBUTE6":" ","ATTRIBUTE7":" ","ATTRIBUTE8":" ","ATTRIBUTE9":" ","ATTRIBUTE10":" ","TRANSACTION_STATUS":" ","TRANS_STATUS_DESCRIPTION":" "},{"ORACLE_UNIQUE_REC_ID":"123assd4434","CUSTOMER_ID":"PMC","ORGANIZATION_CODE":"BMftrdsM","ITEM":"696738","INVENTORY_ITEM_ID":"0000000000000000000000000000546","ORGANIZATION_ID":" ","SUBINVENTORY_CODE":"000000000000000000","LOCATOR_ID":" ","ISA_MATERIAL_GROUP":" ","TAX_GROUP":" ","CATEGORY_ID":"1956","NOUN":" ","MODIFIER":" ","MANUFACTURER_ID":" ","MFG_ITEM_ID":" ","UNIT_OF_MEASURE":"BOX","ITEM_TYPE":"P","STOCK_ENABLED_FLAG":"Y","INVENTORY_ITEM_STATUS_CODE":"A","LIST_PRICE_PER_UNIT":"0","FULL_LEAD_TIME":"0","MAX_MINMAX_QUANTITY":"10","MIN_MINMAX_QUANTITY":"10","SAFETY_LEVEL":"0","REPLENISH_TO_ORDER_FLAG":"N","UTILIZ_CD":"","CURRENCY_CD":"USD","DESCRIPTION":"","ATTRIBUTE1":" ","ATTRIBUTE2":" ","ATTRIBUTE3":" ","ATTRIBUTE4":" ","ATTRIBUTE5":" ","ATTRIBUTE6":" ","ATTRIBUTE7":" ","ATTRIBUTE8":" ","ATTRIBUTE9":" ","ATTRIBUTE10":" ","TRANSACTION_STATUS":" ","TRANS_STATUS_DESCRIPTION":" "},{"ORACLE_UNIQUE_REC_ID":"123assd4434","CUSTOMER_ID":"PMC","ORGANIZATION_CODE":"BMftrdsM","ITEM":"696738","INVENTORY_ITEM_ID":"0000000000000000000000000000546","ORGANIZATION_ID":" ","SUBINVENTORY_CODE":"000000000000000000","LOCATOR_ID":" ","ISA_MATERIAL_GROUP":" ","TAX_GROUP":" ","CATEGORY_ID":"1956","NOUN":" ","MODIFIER":" ","MANUFACTURER_ID":" ","MFG_ITEM_ID":" ","UNIT_OF_MEASURE":"BOX","ITEM_TYPE":"P","STOCK_ENABLED_FLAG":"Y","INVENTORY_ITEM_STATUS_CODE":"A","LIST_PRICE_PER_UNIT":"0","FULL_LEAD_TIME":"0","MAX_MINMAX_QUANTITY":"10","MIN_MINMAX_QUANTITY":"10","SAFETY_LEVEL":"0","REPLENISH_TO_ORDER_FLAG":"N","UTILIZ_CD":"","CURRENCY_CD":"USD","DESCRIPTION":"","ATTRIBUTE1":" ","ATTRIBUTE2":" ","ATTRIBUTE3":" ","ATTRIBUTE4":" ","ATTRIBUTE5":" ","ATTRIBUTE6":" ","ATTRIBUTE7":" ","ATTRIBUTE8":" ","ATTRIBUTE9":" ","ATTRIBUTE10":" ","TRANSACTION_STATUS":" ","TRANS_STATUS_DESCRIPTION":" "}],"Organization":"PMC Biogenix","SharedSecret":"sTc1QowIu5Iy1Qt8iilnmQ==","TimeStamp":"09/28/2018 00:19:21","RowsSent":"1"}';
      l_amt         integer := dbms_lob.lobmaxsize;
      l_dest_offset integer := 1;
      l_src_offset  integer := 1;
      l_csid        integer := dbms_lob.default_csid;
      l_ctx         integer := dbms_lob.default_lang_ctx;
      l_warn        integer;

    BEGIN

     dbms_lob.createTemporary( l_blob, false );
      dbms_lob.convertToBlob( l_blob,
                              l_clob,
                              l_amt,
                              l_dest_offset,
                              l_src_offset,
                              l_csid,
                              l_ctx,
                              l_warn );

    INSERT INTO PS_ISA_INB_PAYLOAD_LOG Values(ORGANIZATIONNAME,TRANSACTION_TYPE,l_blob,SYSDATE,TRANSACTION_STATUS); 
END SDIX_TICK_LOG;

Answer 1

您的问题出在这里：DBMS_LOB.SUBSTR()

DBMS_LOB在内部使用VARCHAR2，并且VARCHAR2的限制为 2000 个字符。您的Blob大小为 2829 个字符，因此太长了，无法被DBMS_LOB.SUBSTR()立即处理。

您可以通过以下命令对此进行测试：

仅从BLOB中获取前 2000 个字符：

 select utl_raw.cast_to_varchar2(dbms_lob.substr(TRANSACTION_DATA), 2000, 1) from PS_ISA_INB_PAYLOAD_LOG;

好。

从BLOB中获取 2001 个字符：

select utl_raw.cast_to_varchar2(dbms_lob.substr(TRANSACTION_DATA, 2001, 1)) from PS_ISA_INB_PAYLOAD_LOG;

错误报告-   SQL错误：

ORA-06502：PL / SQL：数字或值错误：原始变量长度过长

ORA-06512：在第1行

06502.00000-“ PL / SQL：数字或值错误％s”

Answer 2

Is that possible to select entire BLOB Field value?

基本上没有。您将需要一个与您已经描述过的PL / SQL函数类似的功能，除了这次，它将使用BLOB-to-CLOB。如果SQL返回CLOB或VARCHAR2（4000），则可以从SQL调用它。

作为旁注，我质疑您为什么要采用JSON（即字符数据）并将其存储为BLOB，然后想要取回字符数据。为什么不首先将其存储为CLOB？

数字或值错误：原始变量长度太长ORA-06512：位于“ SYS.UTL_RAW”

2 个答案: