SQLNativeSql - Get native SQL text
SQLNativeSql() is used to show how DB2® for i CLI interprets vendor escape clauses. If the original SQL string that is passed by the application contains vendor escape clause sequences, DB2 for i CLI returns the transformed SQL string that is seen by the data source (with vendor escape clauses either converted or discarded as appropriate).
Syntax
SQLRETURN SQLNativeSql (SQLHDBC ConnectionHandle,
SQLCHAR *InStatementText,
SQLINTEGER TextLength1,
SQLCHAR *OutStatementText,
SQLINTEGER BufferLength,
SQLINTEGER *TextLength2Ptr);
Function arguments
Data type | Argument | Use | Description |
---|---|---|---|
SQLHDBC | ConnectionHandle | Input | Connection handle. |
SQLCHAR * | InStatementText | Input | Input SQL string. |
SQLINTEGER | TextLength1 | Input | Length of InStatementText. |
SQLCHAR * | OutStatementText | Output | Pointer to buffer for the transformed output string. |
SQLINTEGER | BufferLength | Input | Size of buffer pointed by OutStatementText. |
SQLINTEGER * | TextLength2Ptr | Output | The total number of bytes available to return in OutStatementText. If the number of bytes available to return is greater than or equal to BufferLength, the output SQL string in OutStatementText is truncated to BufferLength - 1 bytes. The value SQL_NULL_DATA is returned if no output string is generated. |
Usage
This function is called when the application wants to examine or display the transformed SQL string that is passed to the data source by DB2 for i CLI. Translation (mapping) only occurs if the input SQL statement string contains vendor escape clause sequences.
There are no vendor escape sequences on the IBM® i operating system; this function is provided for compatibility purposes. Also, note that this function can be used to evaluate an SQL string for syntax errors.
Return codes
- SQL_SUCCESS
- SQL_SUCCESS_WITH_INFO
- SQL_ERROR
- SQL_INVALID_HANDLE
Error conditions
SQLSTATE | Description | Explanation |
---|---|---|
01004 | Data truncated | The buffer OutStatementText is not large enough to contain the entire SQL string, so truncation occurred. The argument TextLength2Ptr contains the total length of the untruncated SQL string. (Function returns with SQL_SUCCESS_WITH_INFO.) |
08003 | Connection is closed | The ConnectionHandle does not reference an open database connection. |
37000 | SQL syntax that is not valid | The input SQL string in InStatementText contained a syntax error. |
HY001 | Memory allocation failure | DB2 for i CLI is unable to allocate memory required to support the processing or completion of the function. |
HY009 | Argument value that is not valid | The argument InStatementText, OutStatementText, or TextLength2Ptr is a null pointer. |
HY090 | String or buffer length that is not valid | The argument TextLength1 is
less than 0, but not equal to SQL_NTS. The argument BufferLength is less than 0. |
Restrictions
None.
Example
/* From CLI sample native.c */
/* ... */
SQLCHAR in_stmt[1024], out_stmt[1024] ;
SQLSMALLINT pcPar ;
SQLINTEGER indicator ;
/* ... */
/* Prompt for a statement to prepare */
printf("Enter an SQL statement: \n");
gets((char *)in_stmt);
/* prepare the statement */
rc = SQLPrepare(hstmt, in_stmt, SQL_NTS);
CHECK_HANDLE( SQL_HANDLE_STMT, hstmt, rc ) ;
SQLNumParams(hstmt, &pcPar);
CHECK_HANDLE( SQL_HANDLE_STMT, hstmt, rc ) ;
SQLNativeSql(hstmt, in_stmt, SQL_NTS, out_stmt, 1024, &indicator);
CHECK_HANDLE( SQL_HANDLE_STMT, hstmt, rc ) ;
if ( indicator == SQL_NULL_DATA ) printf( "Invalid statement\n" ) ;
else {
printf( "Input Statement: \n %s \n", in_stmt ) ;
printf( "Output Statement: \n %s \n", in_stmt ) ;
printf( "Number of Parameter Markers = %d\n", pcPar ) ;
}
rc = SQLFreeHandle( SQL_HANDLE_STMT, hstmt ) ;
CHECK_HANDLE( SQL_HANDLE_STMT, hstmt, rc ) ;