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Each CLI function returns a short integer value that indicates its completion status. If the completion status indicates an error, the error-handling CLI calls shown in Figure 19-21 can be used to obtain more information about the error and diagnose it. The most basic error-handling call is SQLError(). The application program passes the environment, connection, and statement handles and is returned the SQL2 SQLSTATE result code, the native error code of the subsystem producing the error, and an error message in text form. The SQLError() routine actually retrieves specific, frequently used information from the CLI diagnostics area. The other error-handling routines provide more complete information through direct access to the diagnostic records created and maintained by the CLI. In general, a CLI call can produce multiple errors, which result in multiple diagnostic records. The SQLGetDiagRec() call retrieves an individual diagnostic record, by record number. Through repeated calls, the application program can retrieve complete information about all error records produced by a CLI call. Even more complete information can be obtained by interrogating individual diagnostic fields within the record. This capability is provided by the SQLGetDiagField() call. Although not strictly an error-processing function, the SQLRowCount() function, like the error-handling functions, is called after a previous CLI SQLExecute() call. It is used to determine the impact of the previous statement when it was successful. A returned value indicates the number of rows of data affected by the previously executed statement. (For example, the value 4 would be returned for a searched UPDATE statement that updates four rows.)
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The CLI provides a number of options that control some of the details of its processing. Some of these control relatively minor but critical details, such as whether the CLI should automatically assume that parameters passed as string values are NULL-terminated. Others control broader aspects of CLI operation, such as the scrollability of cursors. The CLI gives application programs the capability to control these processing options through a set of CLI attributes. The attributes are structured in a hierarchy, paralleling the environment/connection/statement hierarchy of the CLI handle structure. Environment
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/* Retrieve error information associated with a previous CLI call */ short SQLError ( long envHdl, /* IN: environment handle */ long connHdl, /* IN: connection handle */ long stmtHdl, /* IN: statement handle */ char *sqlstate, /* OUT: five-character SQLSTATE value */ long *nativeerr, /* OUT: returned native error code */ char *msgbuf, /* OUT: buffer for err message text */ short buflen, /* IN: length of err msg text buffer */ short *msglen) /* OUT: returned actual msg length */ /* Determine number of rows affected by previous SQL statement */ short SQLRowCount ( long stmtHdl, /* IN: statement handle */ long *rowcnt) /* OUT: number of rows */ /* Retrieve info from one of the CLI short SQLGetDiagRec ( short hdltype, /* IN: long inHdl, /* IN: short recnr, /* IN: char *sqlstate, /* OUT: long *nativeerr, /* OUT: char *msgbuf, /* OUT: short buflen, /* IN: short *msglen) /* OUT: diagnostic error records */ handle type code */ CLI handle */ requested err record number */ returned 5-char SQLSTATE code */ returned native error code */ buffer for err message text */ length of err msg text buffer */ returned actual msg length */
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/* Retrieve a field from one of the CLI diagnostic error records */ short SQLGetDiagField ( short hdltype, /* IN: handle type code */ long inHdl, /* IN: CLI handle */ short recnr, /* IN: requested err record number */ short diagid, /* IN: diagnostic field id */ void *diaginfo, /* OUT: returned diagnostic info */ short buflen, /* IN: length of diagonal info buffer */ short *actlen) /* OUT: returned actual info length */
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