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/* Retrieve error information associated with a previous CLI call */ SQLSMALLINT SQLError ( SQLINTEGER SQLSMALLINT SQLSMALLINT SQLCHAR SQLCHAR SQLSMALLINT envHdl, connHdl, stmtHdl, *sqlstate, *msgbuf, buflen, /* IN: /* IN: /* IN: environment handle */ connection handle */ statement handle */
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/* OUT: five-character SQLSTATE value */ /* OUT: returned native error code */ /* OUT: buffer for err message text */ /* IN: length of err msg text buffer */ /* OUT: returned actual msg length */
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SQLSMALLINT *nativeerr,
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SQLSMALLINT *msglen)
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/* Determine number of rows affected by previous SQL statement */ SQLSMALLINT SQLRowCount ( SQLSMALLINT SQLSMALLINT stmtHdl, *rowcnt) /* IN: statement handle */ /* OUT: number of rows */
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/* Retrieve info from one of the CLI diagnostic error records */ SQLSMALLINT SQLGetDiagRec ( SQLSMALLINT SQLSMALLINT SQLSMALLINT SQLCHAR SQLCHAR SQLSMALLINT hdltype, inHdl, recnr, *sqlstate, *msgbuf, buflen, /* IN: /* IN: /* IN: handle type code */ CLI handle */ requested err record number */
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/* OUT: returned 5-char SQLSTATE code */ /* OUT: returned native error code */ /* OUT: buffer for err message text */ /* IN: length of err msg text buffer */ /* OUT: returned actual msg length */
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SQLSMALLINT *nativeerr,
SQLSMALLINT *msglen)
/* Retrieve a field from one of the CLI diagnostic error records */ SQLSMALLINT SQLGetDiagField ( SQLSMALLINT SQLSMALLINT SQLSMALLINT SQLSMALLINT void SQLSMALLINT hdltype, inHdl, recnr, diagid, *diaginfo, buflen, /* IN: /* IN: /* IN: /* IN: /* IN: handle type code */ CLI handle */ requested err record number */ diagnostic field id */ length of diagonal info buffer */
/* OUT: returned diagnostic info */ /* OUT: returned actual info length */
SQLSMALLINT *actlen)
FIGURE 19-27
CLI error-handling routines
19:
SQL APIs
CLI Attributes
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 attributes control overall operational options. Connection options apply to a particular connection created by the SQLConnect() call, but may vary from one connection to another. Statement attributes apply to the processing of an individual statement, identified by a CLI statement handle. A set of CLI calls, shown in Figure 19-28, is used by an application program to control attributes. The get calls (SQLGetEnvAttr(), SQLGetConnectAttr(), and SQLGetStmtAttr()) obtain current attribute values. The set calls (SQLSetEnvAttr(), SQLSetConnectAttr(), and SQLSetStmtAttr()) modify the current attribute values. In all of the calls, the particular attribute being processed is indicated by a code value. Although the CLI standard provides this elaborate attribute structure, it actually specifies relatively few attributes. The single environment attribute specified is NULL TERMINATION; it controls null-terminated strings. The single connection attribute specified controls whether the CLI automatically populates a parameter descriptor when a statement is prepared or executed. Statement-level attributes control the scrollability and sensitivity of cursors. Perhaps the most important of the CLI-specified attributes are the handles of the four CLI descriptors that may be associated with a statement (two parameter descriptors and two row descriptors). The calls in Figure 19-28 are used to obtain and set these descriptor handles when using descriptor-based statement processing. The ODBC API, on which the SQL/CLI standard was originally based, includes many more attributes. For example, ODBC connection attributes can be used to specify a readonly connection, to enable asynchronous statement processing, to specify the timeout for a connection request, and so on. ODBC environment attributes control automatic translation of ODBC calls from earlier versions of the ODBC standard. ODBC statement attributes control transaction isolation levels, specify whether a cursor is scrollable, and limit the number of rows of query results that might be generated by a runaway query.
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