SQL Server Native Client (SNAC) is not supported beyond SQL Server 2012. Avoid using SNAC in new development work, and plan to modify applications that currently use it. The Microsoft ODBC Driver for SQL Server provides native connectivity from Windows to Microsoft SQL Server and Microsoft Azure SQL Database.
The following restrictions apply when using SQLPutData to send more than 65,535 bytes of data (for SQL Server version 4.21a) or 400 KB of data (for SQL Server version 6.0 and later) for a SQL_LONGVARCHAR (text), SQL_WLONGVARCHAR (ntext) or SQL_LONGVARBINARY (image) column:
The referenced parameter can be the insert_value in an INSERT statement.
The referenced parameter can be an expression in the SET clause of an UPDATE statement.
Canceling a sequence of SQLPutData calls that provide data in blocks to a server running SQL Server causes a partial update of the column's value when using version 6.5 or earlier. The text, ntext, or image column that was referenced when SQLCancel was called is set to an intermediate placeholder value.
There is one SQL Server Native Client specific SQLSTATE for SQLPutData:
|22026||String data, length mismatch||If the length of data in bytes to be sent has been specified by an application, for example, with SQL_LEN_DATA_AT_EXEC(n) where n is greater than 0, the total number of bytes given by the application via SQLPutData must match the specified length.|
SQLPutData is used by an application when using variable row binding with table-valued parameters. The StrLen_Or_Ind parameter indicates that it is ready for the driver to collect data for the next row or rows of table-valued parameter data, or that no more rows are available:
A value greater than 0 indicates that the next set of row values is available.
A value of 0 indicates that there are no more rows to be sent.
Any value less than 0 is an error and results in a diagnostic record being logged with SQLState HY090 and the messaage "Invalid string or buffer length".
The DataPtr parameter is ignored, but must be set to a non-NULL value. For more information, see the section on Variable TVP row binding in Binding and Data Transfer of Table-Valued Parameters and Column Values.
If StrLen_Or_Ind has any value other than SQL_DEFAULT_PARAM or a number between 0 and the SQL_PARAMSET_SIZE (that is, the ColumnSize parameter of SQLBindParameter), it is an error. This error causes SQLPutData to return SQL_ERROR: SQLSTATE=HY090, "Invalid string or buffer length".
For more information about table-valued parameters, see Table-Valued Parameters (ODBC).
Parameter values of date/time types are converted as described in Conversions from C to SQL.
For more information, see Date and Time Improvements (ODBC).
SQLPutData supports large CLR user-defined types (UDTs). For more information, see Large CLR User-Defined Types (ODBC).