SQL_ ATTR_CONCURRENCY
SQL_ ATTR_CURSOR_TYPE
SQL_ ATTR_KEYSET_SIZE
SQL_ ATTR_MAX_LENGTH
SQL_ ATTR_MAX_ROWS
SQL_ ATTR_QUERY_TIMEOUT
SQL_ATTR_ROW_ARRAY_SIZE
SQL_ ATTR_SIMULATE_CURSOR

(Function returns SQL_SUCCESS_WITH_INFO.)

(DM) SQLExecute, SQLExecDirect, SQLBulkOperations, or SQLSetPos was called for the StatementHandle and returned SQL_NEED_DATA. This function was called before data was sent for all data-at-execution parameters or columns.

(DM) The Attribute argument was SQL_ATTR_APP_ROW_DESC or SQL_ATTR_APP_PARAM_DESC, and the value in ValuePtr was an implicitly allocated descriptor handle other than the handle originally allocated for the ARD or APD.

The Attribute argument was SQL_ATTR_APP_ROW_DESC or SQL_ATTR_APP_PARAM_DESC, and ValuePtr was an explicitly allocated descriptor handle that is not on the same connection as the StatementHandle argument.

(DM) The value specified for the argument Attribute was a read-only attribute.

The Attribute argument was SQL_ATTR_ASYNC_ENABLE, and a call to SQLGetInfo with an InfoType of SQL_ASYNC_MODE returns SQL_AM_CONNECTION.

The Attribute argument was SQL_ATTR_ENABLE_AUTO_IPD, and the value of the connection attribute SQL_ATTR_AUTO_IPD was SQL_FALSE.

This attribute cannot be set to a descriptor handle that was implicitly allocated for another statement or to another descriptor handle that was implicitly set on the same statement; implicitly allocated descriptor handles cannot be associated with more than one statement or descriptor handle.

This attribute cannot be set to a descriptor handle that was implicitly allocated for another statement or to another descriptor handle that was implicitly set on the same statement; implicitly allocated descriptor handles cannot be associated with more than one statement or descriptor handle.

SQL_ASYNC_ENABLE_OFF = Off (the default)
SQL_ASYNC_ENABLE_ON = On

Once a function has been called asynchronously, only the original function, SQLCancel, SQLGetDiagField, or SQLGetDiagRec can be called on the statement, and only the original function, SQLAllocHandle (with a HandleType of SQL_HANDLE_STMT), SQLGetDiagField, SQLGetDiagRec, or SQLGetFunctions can be called on the connection associated with the statement, until the original function returns a code other than SQL_STILL_EXECUTING. Any other function called on the statement or the connection associated with the statement returns SQL_ERROR with an SQLSTATE of HY010 (Function sequence error). Functions can be called on other statements. For more information, see "Asynchronous Execution" in Chapter 9, "Executing Statements."

For drivers with statement level asynchronous execution support, the statement attribute SQL_ATTR_ASYNC_ENABLE may be set. Its initial value is the same as the value of the connection level attribute with the same name at the time the statement handle was allocated.

For drivers with connection-level, asynchronous-execution support, the statement attribute SQL_ATTR_ASYNC_ENABLE is read-only. Its value is the same as the value of the connection level attribute with the same name at the time the statement handle was allocated. Calling SQLSetStmtAttr to set SQL_ATTR_ASYNC_ENABLE when the SQL_ASYNC_MODE InfoType returns SQL_AM_CONNECTION returns SQLSTATE HYC00 (Optional feature not implemented). (See SQLSetConnectAttr for more information.)

As a standard practice, applications should execute functions asynchronously only on single-thread operating systems. On multithread operating systems, applications should execute functions on separate threads rather than executing them asynchronously on the same thread. No functionality is lost if drivers that operate only on multithread operating systems do not need to support asynchronous execution.

The following functions can be executed asynchronously:

SQLBulkOperations
SQLColAttribute
SQLColumnPrivileges
SQLColumns
SQLCopyDesc
SQLDescribeCol
SQLDescribeParam
SQLExecDirect
SQLExecute
SQLFetch
SQLFetchScroll
SQLForeignKeys
SQLGetData
SQLGetDescField^[1]
SQLGetDescRec^[1]
SQLGetDiagField
SQLGetDiagRec
SQLGetTypeInfo
SQLMoreResults
SQLNumParams
SQLNumResultCols
SQLParamData
SQLPrepare
SQLPrimaryKeys
SQLProcedureColumns
SQLProcedures
SQLPutData
SQLSetPos
SQLSpecialColumns
SQLStatistics
SQLTablePrivileges
SQLTables

SQL_CONCUR_READ_ONLY = Cursor is read-only. No updates are allowed.

SQL_CONCUR_LOCK = Cursor uses the lowest level of locking sufficient to ensure that the row can be updated.

SQL_CONCUR_ROWVER = Cursor uses optimistic concurrency control, comparing row versions such as SQLBase ROWID or Sybase TIMESTAMP.

SQL_CONCUR_VALUES = Cursor uses optimistic concurrency control, comparing values.

The default value for SQL_ATTR_CONCURRENCY is SQL_CONCUR_READ_ONLY.

This attribute cannot be specified for an open cursor. For more information, see "Concurrency Types" in Chapter 14, "Transactions."

If the SQL_ATTR_CURSOR_TYPE Attribute is changed to a type that does not support the current value of SQL_ATTR_CONCURRENCY, the value of SQL_ATTR_CONCURRENCY will be changed at execution time, and a warning issued when SQLExecDirect or SQLPrepare is called.

If the driver supports the SELECT FOR UPDATE statement and such a statement is executed while the value of SQL_ATTR_CONCURRENCY is set to SQL_CONCUR_READ_ONLY, an error will be returned. If the value of SQL_ATTR_CONCURRENCY is changed to a value that the driver supports for some value of SQL_ATTR_CURSOR_TYPE but not for the current value of SQL_ATTR_CURSOR_TYPE, the value of SQL_ATTR_CURSOR_TYPE will be changed at execution time and SQLSTATE 01S02 (Option value changed) is issued when SQLExecDirect or SQLPrepare is called.

If the specified concurrency is not supported by the data source, the driver substitutes a different concurrency and returns SQLSTATE 01S02 (Option value changed). For SQL_CONCUR_VALUES, the driver substitutes SQL_CONCUR_ROWVER, and vice versa. For SQL_CONCUR_LOCK, the driver substitutes, in order, SQL_CONCUR_ROWVER or SQL_CONCUR_VALUES. The validity of the substituted value is not checked until execution time.

For more information about the relationship between SQL_ATTR_CONCURRENCY and the other cursor attributes, see "Cursor Characteristics and Cursor Type" in Chapter 11, "Retrieving Results (Advanced)."

SQL_NONSCROLLABLE = Scrollable cursors are not required on the statement handle. If the application calls SQLFetchScroll on this handle, the only valid value of FetchOrientation is SQL_FETCH_NEXT. This is the default.

SQL_SCROLLABLE = Scrollable cursors are required on the statement handle. When calling SQLFetchScroll, the application may specify any valid value of FetchOrientation, achieving cursor positioning in modes other than the sequential mode.

For more information about scrollable cursors, see "Scrollable Cursors" in Chapter 11, "Retrieving Results (Advanced)." For more information about the relationship between SQL_ATTR_CURSOR_SCROLLABLE and the other cursor attributes, see "Cursor Characteristics and Cursor Type" in Chapter 11, "Retrieving Results (Advanced)."

SQL_UNSPECIFIED = It is unspecified what the cursor type is and whether cursors on the statement handle make visible the changes made to a result set by another cursor. Cursors on the statement handle may make visible none, some, or all such changes. This is the default.

SQL_INSENSITIVE = All cursors on the statement handle show the result set without reflecting any changes made to it by any other cursor. Insensitive cursors are read-only. This corresponds to a static cursor, which has a concurrency that is read-only.

SQL_SENSITIVE = All cursors on the statement handle make visible all changes made to a result set by another cursor.

For more information about the relationship between SQL_ATTR_CURSOR_SENSITIVITY and the other cursor attributes, see "Cursor Characteristics and Cursor Type" in Chapter 11, "Retrieving Results (Advanced)."

SQL_CURSOR_FORWARD_ONLY = The cursor only scrolls forward.

SQL_CURSOR_STATIC = The data in the result set is static.

SQL_CURSOR_KEYSET_DRIVEN = The driver saves and uses the keys for the number of rows specified in the SQL_ATTR_KEYSET_SIZE statement attribute.

SQL_CURSOR_DYNAMIC = The driver saves and uses only the keys for the rows in the rowset.

The default value is SQL_CURSOR_FORWARD_ONLY. This attribute cannot be specified after the SQL statement has been prepared.

If the specified cursor type is not supported by the data source, the driver substitutes a different cursor type and returns SQLSTATE 01S02 (Option value changed). For a mixed or dynamic cursor, the driver substitutes, in order, a keyset-driven or static cursor. For a keyset-driven cursor, the driver substitutes a static cursor.

For more information about scrollable cursor types, see "Scrollable Cursor Types" in Chapter 11, "Retrieving Results (Advanced)." For more information about the relationship between SQL_ATTR_CURSOR_TYPE and the other cursor attributes, see "Cursor Characteristics and Cursor Type" in Chapter 11, "Retrieving Results (Advanced)."

SQL_TRUE = Turns on automatic population of the IPD after a call to SQLPrepare. SQL_FALSE = Turns off automatic population of the IPD after a call to SQLPrepare. (An application can still obtain IPD field information by calling SQLDescribeParam, if supported.) The default value of the statement attribute SQL_ATTR_ENABLE_AUTO_IPD is SQL_FALSE. For more information, see "Automatic Population of the IPD" in Chapter 13, "Descriptors."

The value pointed to by this field is not used for delete by bookmark, update by bookmark, or fetch by bookmark operations in SQLBulkOperations, which use bookmarks cached in rowset buffers.

This attribute can be retrieved by a call to SQLGetStmtAttr but not set by a call to SQLSetStmtAttr.

This attribute can be retrieved by a call to SQLGetStmtAttr but not set by a call to SQLSetStmtAttr.

If the specified size exceeds the maximum keyset size, the driver substitutes that size and returns SQLSTATE 01S02 (Option value changed).

SQLFetch or SQLFetchScroll returns an error if the keyset size is greater than 0 and less than the rowset size.

If the specified length is less than the minimum amount of data that the data source can return or greater than the maximum amount of data that the data source can return, the driver substitutes that value and returns SQLSTATE 01S02 (Option value changed).

The value of this attribute can be set on an open cursor; however, the setting might not take effect immediately, in which case the driver will return SQLSTATE 01S02 (Option value changed) and reset the attribute to its original value.

This attribute is intended to reduce network traffic and should be supported only when the data source (as opposed to the driver) in a multiple-tier driver can implement it. This mechanism should not be used by applications to truncate data; to truncate data received, an application should specify the maximum buffer length in the BufferLength argument in SQLBindCol or SQLGetData.

This attribute is intended to reduce network traffic. Conceptually, it is applied when the result set is created and limits the result set to the first ValuePtr rows. If the number of rows in the result set is greater than ValuePtr, the result set is truncated.

SQL_ATTR_MAX_ROWS applies to all result sets on the Statement, including those returned by catalog functions. SQL_ATTR_MAX_ROWS establishes a maximum for the value of the cursor row count.

A driver should not emulate SQL_ATTR_MAX_ROWS behavior for SQLFetch or SQLFetchScroll (if result set size limitations cannot be implemented at the data source) if it cannot guarantee that SQL_ATTR_MAX_ROWS will be implemented properly.

It is driver-defined whether SQL_ATTR_MAX_ROWS applies to statements other than SELECT statements (such as catalog functions).

The value of this attribute can be set on an open cursor; however, the setting might not take effect immediately, in which case the driver will return SQLSTATE 01S02 (Option value changed) and reset the attribute to its original value.

If SQL_TRUE, the string argument of catalog functions are treated as identifiers. The case is not significant. For nondelimited strings, the driver removes any trailing spaces and the string is folded to uppercase. For delimited strings, the driver removes any leading or trailing spaces and takes whatever is between the delimiters literally. If one of these arguments is set to a null pointer, the function returns SQL_ERROR and SQLSTATE HY009 (Invalid use of null pointer).

If SQL_FALSE, the string arguments of catalog functions are not treated as identifiers. The case is significant. They can either contain a string search pattern or not, depending on the argument.

The default value is SQL_FALSE.

The TableType argument of SQLTables, which takes a list of values, is not affected by this attribute.

SQL_ATTR_METADATA_ID can also be set on the connection level. (It and SQL_ATTR_ASYNC_ENABLE are the only statement attributes that are also connection attributes.)

For more information, see "Arguments in Catalog Functions" in Chapter 7, "Catalog Functions."

SQL_NOSCAN_OFF = The driver scans SQL strings for escape sequences (the default).

SQL_NOSCAN_ON = The driver does not scan SQL strings for escape sequences. Instead, the driver sends the statement directly to the data source.

For more information, see "Escape Sequences in ODBC" in Chapter 8, "SQL Statements."

The bind offset is always added directly to the SQL_DESC_DATA_PTR, SQL_DESC_INDICATOR_PTR, and SQL_DESC_OCTET_LENGTH_PTR fields. If the offset is changed to a different value, the new value is still added directly to the value in the descriptor field. The new offset is not added to the field value plus any earlier offsets.

Setting this statement attribute sets the SQL_DESC_BIND_OFFSET_PTR field in the APD header.

This field is set to SQL_PARAM_BIND_BY_COLUMN (the default) to select column-wise binding.

To select row-wise binding, this field is set to the length of the structure or an instance of a buffer that will be bound to a set of dynamic parameters. This length must include space for all of the bound parameters and any padding of the structure or buffer to ensure that when the address of a bound parameter is incremented with the specified length, the result will point to the beginning of the same parameter in the next set of parameters. When using the sizeof operator in ANSI C, this behavior is guaranteed.

For more information, see "Binding Arrays of Parameters" in Chapter 9, "Executing Statements."

Setting this statement attribute sets the SQL_DESC_ BIND_TYPE field in the APD header.

A set of parameters can be ignored during processing by setting the status value in the array pointed to by SQL_DESC_ARRAY_STATUS_PTR in the APD to SQL_PARAM_IGNORE. A set of parameters is processed if its status value is set to SQL_PARAM_PROCEED or if no elements in the array are set.

This statement attribute can be set to a null pointer, in which case the driver does not return parameter status values. This attribute can be set at any time, but the new value is not used until the next time SQLExecDirect or SQLExecute is called.

For more information, see "Using Arrays of Parameters" in Chapter 9, "Executing Statements."

Setting this statement attribute sets the SQL_DESC_ARRAY_STATUS_PTR field in the APD header.

The status values can contain the following values:

SQL_PARAM_SUCCESS: The SQL statement was successfully executed for this set of parameters.

SQL_PARAM_SUCCESS_WITH_INFO: The SQL statement was successfully executed for this set of parameters; however, warning information is available in the diagnostics data structure.

SQL_PARAM_ERROR: There was an error in processing this set of parameters. Additional error information is available in the diagnostics data structure.

SQL_PARAM_UNUSED: This parameter set was unused, possibly due to the fact that some previous parameter set caused an error that aborted further processing, or because SQL_PARAM_IGNORE was set for that set of parameters in the array specified by the SQL_ATTR_PARAM_OPERATION_PTR.

SQL_PARAM_DIAG_UNAVAILABLE: The driver treats arrays of parameters as a monolithic unit and so does not generate this level of error information.

This statement attribute can be set to a null pointer, in which case the driver does not return parameter status values. This attribute can be set at any time, but the new value is not used until the next time SQLExecute or SQLExecDirect is called. Note that setting this attribute can affect the output parameter behavior implemented by the driver.

For more information, see "Using Arrays of Parameters" in Chapter 9, "Executing Statements."

Setting this statement attribute sets the SQL_DESC_ARRAY_STATUS_PTR field in the IPD header.

Setting this statement attribute sets the SQL_DESC_ROWS_PROCESSED_PTR field in the IPD header.

If the call to SQLExecDirect or SQLExecute that fills in the buffer pointed to by this attribute does not return SQL_SUCCESS or SQL_SUCCESS_WITH_INFO, the contents of the buffer are undefined.

For more information, see "Using Arrays of Parameters" in Chapter 9, "Executing Statements."

For more information, see "Using Arrays of Parameters" in Chapter 9, "Executing Statements."

Setting this statement attribute sets the SQL_DESC_ARRAY_SIZE field in the APD header.

If the specified timeout exceeds the maximum timeout in the data source or is smaller than the minimum timeout, SQLSetStmtAttr substitutes that value and returns SQLSTATE 01S02 (Option value changed).

Note that the application need not call SQLCloseCursor to reuse the statement if a SELECT statement timed out.

The query timeout set in this statement attribute is valid in both synchronous and asynchronous modes.

SQL_RD_ON = SQLFetchScroll and, in ODBC 3.x, SQLFetch retrieve data after it positions the cursor to the specified location. This is the default.

SQL_RD_OFF = SQLFetchScroll and, in ODBC 3.x, SQLFetch do not retrieve data after it positions the cursor.

By setting SQL_RETRIEVE_DATA to SQL_RD_OFF, an application can verify that a row exists or retrieve a bookmark for the row without incurring the overhead of retrieving rows. For more information, see "Scrolling and Fetching Rows" in Chapter 11, "Retrieving Results (Advanced)."

The value of this attribute can be set on an open cursor; however, the setting might not take effect immediately, in which case the driver will return SQLSTATE 01S02 (Option value changed) and reset the attribute to its original value.

If the specified rowset size exceeds the maximum rowset size supported by the data source, the driver substitutes that value and returns SQLSTATE 01S02 (Option value changed).

For more information, see "Rowset Size" in Chapter 11, "Retrieving Results (Advanced)."

Setting this statement attribute sets the SQL_DESC_ARRAY_SIZE field in the ARD header.

Setting this statement attribute sets the SQL_DESC_BIND_OFFSET_PTR field in the ARD header.

If a length is specified, it must include space for all of the bound columns and any padding of the structure or buffer to ensure that when the address of a bound column is incremented with the specified length, the result will point to the beginning of the same column in the next row. When using the sizeof operator with structures or unions in ANSI C, this behavior is guaranteed.

Column-wise binding is the default binding orientation for SQLFetch and SQLFetchScroll.

For more information, see "Binding Columns for Use with Block Cursors" in Chapter 11, "Retrieving Results (Advanced)."

Setting this statement attribute sets the SQL_DESC_BIND_TYPE field in the ARD header.

This attribute can be retrieved by a call to SQLGetStmtAttr but not set by a call to SQLSetStmtAttr.

This statement attribute can be set to a null pointer, in which case the driver does not return row status values. This attribute can be set at any time, but the new value is not used until the next time SQLSetPos is called.

For more information, see "Updating Rows in the Rowset with SQLSetPos" and "Deleting Rows in the Rowset with SQLSetPos" in Chapter 12, "Updating Data."

Setting this statement attribute sets the SQL_DESC_ARRAY_STATUS_PTR field in the ARD.

This statement attribute can be set to a null pointer, in which case the driver does not return row status values. This attribute can be set at any time, but the new value is not used until the next time SQLBulkOperations, SQLFetch, SQLFetchScroll, or SQLSetPos is called.

For more information, see "Number of Rows Fetched and Status" in Chapter 11, "Retrieving Results (Advanced)."

Setting this statement attribute sets the SQL_DESC_ARRAY_STATUS_PTR field in the IRD header.

This attribute is mapped by an ODBC 2.x driver to the rgbRowStatus array in a call to SQLExtendedFetch.

For more information, see "Number of Rows Fetched and Status" in Chapter 11, "Retrieving Results (Advanced)."

Setting this statement attribute sets the SQL_DESC_ROWS_PROCESSED_PTR field in the IRD header.

If the call to SQLFetch or SQLFetchScroll that fills in the buffer pointed to by this attribute does not return SQL_SUCCESS or SQL_SUCCESS_WITH_INFO, the contents of the buffer are undefined.

To simulate positioned update and delete statements, most drivers construct a searched UPDATE or DELETE statement containing a WHERE clause that specifies the value of each column in the current row. Unless these columns make up a unique key, such a statement can affect more than one row.

To guarantee that such statements affect only one row, the driver determines the columns in a unique key and adds these columns to the result set. If an application guarantees that the columns in the result set make up a unique key, the driver is not required to do so. This may reduce execution time.

SQL_SC_NON_UNIQUE = The driver does not guarantee that simulated positioned update or delete statements will affect only one row; it is the application's responsibility to do so. If a statement affects more than one row, SQLExecute, SQLExecDirect, or SQLSetPos returns SQLSTATE 01001 (Cursor operation conflict).

SQL_SC_TRY_UNIQUE = The driver attempts to guarantee that simulated positioned update or delete statements affect only one row. The driver always executes such statements, even if they might affect more than one row, such as when there is no unique key. If a statement affects more than one row, SQLExecute, SQLExecDirect, or SQLSetPos returns SQLSTATE 01001 (Cursor operation conflict).

SQL_SC_UNIQUE = The driver guarantees that simulated positioned update or delete statements affect only one row. If the driver cannot guarantee this for a given statement, SQLExecDirect or SQLPrepare returns an error.

If the data source provides native SQL support for positioned update and delete statements and the driver does not simulate cursors, SQL_SUCCESS is returned when SQL_SC_UNIQUE is requested for SQL_SIMULATE_CURSOR. SQL_SUCCESS_WITH_INFO is returned if SQL_SC_TRY_UNIQUE or SQL_SC_NON_UNIQUE is requested. If the data source provides the SQL_SC_TRY_UNIQUE level of support and the driver does not, SQL_SUCCESS is returned for SQL_SC_TRY_UNIQUE and SQL_SUCCESS_WITH_INFO is returned for SQL_SC_NON_UNIQUE.

If the specified cursor simulation type is not supported by the data source, the driver substitutes a different simulation type and returns SQLSTATE 01S02 (Option value changed). For SQL_SC_UNIQUE, the driver substitutes, in order, SQL_SC_TRY_UNIQUE or SQL_SC_NON_UNIQUE. For SQL_SC_TRY_UNIQUE, the driver substitutes SQL_SC_NON_UNIQUE.

For more information, see "Simulating Positioned Update and Delete Statements" in Chapter 12, "Updating Data."

SQL_UB_OFF = Off (the default)

SQL_UB_VARIABLE = An application will use bookmarks with a cursor, and the driver will provide variable-length bookmarks if they are supported. SQL_UB_FIXED is deprecated in ODBC 3.x. ODBC 3.x applications should always use variable-length bookmarks, even when working with ODBC 2.x drivers (which supported only 4-byte, fixed-length bookmarks). This is because a fixed-length bookmark is just a special case of a variable-length bookmark. When working with an ODBC 2.x driver, the Driver Manager maps SQL_UB_VARIABLE to SQL_UB_FIXED.

To use bookmarks with a cursor, the application must specify this attribute with the SQL_UB_VARIABLE value before opening the cursor.

For more information, see "Retrieving Bookmarks" in Chapter 11, "Retrieving Results (Advanced)."