bcp_readfmt

Reads a data file format definition from the specified format file.

語法

RETCODE bcp_readfmt (
        HDBC hdbc,
        LPCTSTR szFormatFile);

Arguments

• hdbc
  Is the bulk copy-enabled ODBC connection handle.

• szFormatFile
  Is the path and file name of the file containing the format values for the data file.

Returns

SUCCEED or FAIL.

備註

After bcp_readfmt reads the format values, it makes the appropriate calls to bcp_columns and bcp_colfmt. There is no need for you to parse a format file and make these calls.

To persist a format file, call bcp_writefmt. Calls to bcp_readfmt can reference saved formats. For more information, see bcp_init.

Alternately, the bulk-copy utility (bcp) can save user-defined data formats in files that can be referenced by bcp_readfmt. For more information about the bcp utility and the structure of bcp data format files, see 使用格式檔案.

附註：
The format file must have been produced by version 4.2 or later of the bcp utility.

Example

// Variables like henv not specified.
HDBC      hdbc;
DBINT      nRowsProcessed;

// Application initiation, get an ODBC environment handle, allocate the
// hdbc, and so on.
... 

// Enable bulk copy prior to connecting on allocated hdbc.
SQLSetConnectAttr(hdbc, SQL_COPT_SS_BCP, (SQLPOINTER) SQL_BCP_ON,
   SQL_IS_INTEGER);

// Connect to the data source, return on error.
if (!SQL_SUCCEEDED(SQLConnect(hdbc, _T("myDSN"), SQL_NTS,
   _T("myUser"), SQL_NTS, _T("myPwd"), SQL_NTS)))
   {
   // Raise error and return.
   return;
   }

// Initialize bulk copy. 
if (bcp_init(hdbc, _T("myTable"), _T("myData.csv"),
   _T("myErrors"),    DB_IN) == FAIL)
   {
   // Raise error and return.
   return;
   }

if (bcp_readfmt(hdbc, _T("myFmtFile.fmt")) == FAIL)
   {
   // Raise error and return.
   return;
   }

if (bcp_exec(hdbc, &nRowsProcessed) == SUCCEED)
   {
   printf("%ld rows copied to SQL Server\n", nRowsProcessed);
   }

// Carry on.

請參閱

參考

Bulk Copy Functions

說明及資訊

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