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SQLBrowseConnect() SQLDrivers() SQLDriverConnect() SQLNumParams() SQLBindParameter() SQLDescribeParam() SQLBulkOperations() SQLMoreResults() SQLSetPos() SQLNativeSQL()
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Supplies information about available ODBC data sources and the attributes required to connect to each Returns a list of the available drivers and driver attribute names Works as an extended form of the SQLConnect() call for passing additional connection information Returns the number of parameters in a previously prepared SQL statement Provides extended functionality beyond the SQL/CLI SQLBindParam() call Returns information about a parameter Performs bulk insertion and bookmark operations Determines whether more results are available for a statement
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Sets the cursor position within a retrieved set of query results for positioned operations Returns the native SQL translation of a supplied ODBC-compliant SQL statement text
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Table 19-5.
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Two of the extended ODBC features are focused on the connection process. Connection browsing is designed to simplify the data source connection process and make it more database independent. SQLBrowseConnect() supports an iterative style of connection for access to ODBC data sources. An application program first calls the function with basic information about the target data source, and the function returns additional connection attributes needed (such as a user name or password). The application program can obtain this information (for example, by prompting the user) and then recalls SQLBrowseConnect() with the additional information. The cycle continues until the application has determined all of the information required for a successful SQLConnect() call. The connection pooling capability is designed to improve the efficiency of ODBC connect/disconnect processing in a client/server environment. When connection pooling is activated, ODBC does not actually terminate network connections upon receiving a SQLDisconnect() call. Instead, the connections are held open in an idle state for some period of time and reused if a SQLConnect() call is made for the same data source. This reuse of connections can significantly cut down the network and login/logout overhead in client/server applications that involve short transactions and high transaction rates.
SQL Dialect Translation
ODBC specifies not just a set of API calls, but also a standard SQL language dialect that is a subset of the SQL2 standard. It is the responsibility of ODBC drivers to translate the ODBC dialect into statements appropriate for the target data source (for example, modifying date/time literals, quote conventions, keywords, and so on). The SQLNativeSQL() call allows the application program to see the effect of this translation. ODBC also supports escape sequences that allow an application program to more explicitly direct the translation of SQL features that tend to be less consistent across SQL dialects, such as outer joins and pattern-matching search conditions.
Asynchronous Execution
An ODBC driver may support asynchronous execution of ODBC functions. When an application program makes an asynchronous mode ODBC call, ODBC initiates the required processing (usually statement preparation or execution) and then immediately returns control to the application program. The application program can proceed with other work and later resynchronize with the ODBC function to determine its completion status. Asynchronous execution can be requested on a per-connection or a per-statement basis. In some cases, asynchronously executing functions can be terminated with a SQLCancel() call, giving the application program a method for aborting long-running ODBC operations.
19:
SQL APIs
Statement-Processing Efficiency
Each ODBC call to execute a SQL statement can involve a significant amount of overhead, especially if the data source involves a client/server network connection. To reduce this overhead, an ODBC driver may support statement batches. With this capability, an application program can pass a sequence of two or more SQL statements as a batch to be executed in a single SQLExecDirect() or SQLExecute() call. For example, a series of a dozen INSERT or UPDATE statements could be executed as a batch in this way. It can significantly reduce network traffic in a client/server environment, but it complicates error detection and recovery, which tend to become driver-specific when statement batches are used. Many DBMS products address the efficiency of multistatement transactions in a different way. They support stored procedures within the database itself, which can collect a sequence of SQL operations, together with the associated flow-control logic, and allow the statements to be invoked with a single call to the procedure. ODBC provides a set of capabilities that allow an application program to directly call a stored procedure in the target data source. For databases that allow stored procedure parameters to be passed by name, ODBC allows parameters to be bound by name instead of by position. For data sources that provide metadata information about stored procedure parameters, the SQLDescribeParam() call allows the application program to determine, at runtime, the required parameter data type. Output parameters of a stored procedure are supported either through SQLBindParam() (in which case, the application program s data buffer is modified upon return from the SQLExecute() or SQLExecDirect() call) or through SQLGetData(), which allows retrieval of long returned data. Two other extended ODBC capabilities provide efficiency when a single SQL statement (such as an INSERT or UPDATE statement) is to be executed repeatedly. Both address the binding of parameters for this situation. With the binding offset feature, once a statement parameter has been bound and the statement has been executed, ODBC allows the application program to change its binding for the next statement execution by specifying a new memory location as an offset from the original location. This is an effective way of binding a parameter to individual items in an array for repeated statement execution. In general, modifying an offset value is much more efficient than rebinding the parameter with repeated calls to SQLBindParam(). ODBC parameter arrays provide an alternative mechanism for an application program to pass multiple sets of parameter values in a single call. For example, if an application program needs to insert multiple rows into a table, it can request execution of a parameterized INSERT statement and bind the parameters to arrays of data values. The effective result is as if multiple INSERT statements are performed one for each set of parameter values. ODBC supports both row-wise parameter arrays (each array element holds one set of parameter values) or columnwise parameter arrays (each parameter value is bound to its own individual array, which holds its values).
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