S?a ch?a: Bo ng?i qu?n l? driver ODBC khng ng co SQL_NO_DATA_FOUND ANSI Driver

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Tri?u ch?ng

Khi b?n s? d?ng m?t tr?nh i?u khi?n ANSI ODBC, qu?n l? driver ODBC khng chnh xc c th? quay l?i SQL_NO_DATA_FOUND cho m?t c?t ?c ?nh ngh?a l VARCHAR ho?c CHAR v r?ng c m?t chu?i r?ng trong n. V?n ? x?y ra N?u cc c?t c ch?a m?t s? d? li?u ho?c m?t gi tr? "Khng". V?n ? ch? x?y ra n?u d? li?u l m?t chu?i r?ng v b?n gi?i h?n trn n t? pha khch hng v?i SQL_C_WCHAR.

Nguyn nhn

Qu?n l? driver ODBC sai gi? ?nh r?ng cc tr?nh i?u khi?n khng c b?t k? d? li?u khi n c? g?ng ? chuy?n ?i chu?i r?ng t? ANSI ? UNICODE.

Gi?i php

? gi?i quy?t v?n ? ny, c ?c cc m?i nh?t gi b?n ghi d?ch v? cho Microsoft SQL Server 2000. ? bi?t thm chi ti?t, b?m vo s? bi vi?t sau ? xem bi vi?t trong Microsoft Knowledge Cn c?:
290211 INF: Lm th? no ? c ?c SQL Server 2000 Service Pack m?i nh?t

Cch gi?i quy?t khc

M?t gi?i php n gi?n cho v?n ? ny l ? gi?i h?n trn cc c?t nh SQL_C_CHAR thay v? SQL_C_WCHAR.

T?nh tr?ng

Microsoft ? xc nh?n r?ng y l m?t v?n ? trong s?n ph?m c?a Microsoft ?c li?t k ? ?u bi vi?t ny. V?n ? ny l?n ?u tin ?c s?a ch?a trong Microsoft SQL Server 2000 Service Pack 3.

Thng tin thm

K? th?a cc ?ng d?ng s? d?ng m?t tr?nh i?u khi?n ANSI ODBC c th? khng g?p v?n ? ny, b?i v? h? c th? khng gi?i h?n trn cc c?t l SQL_C_WCHAR. B?i v? cc nh cung c?p ODBC Microsoft .NET g?n k t? ?i di?n c?t nh SQL_C_WCHAR theo m?c ?nh, b?n c th? g?p v?n ? ny n?u b?n s? d?ng Microsoft.net ODBC Nh cung c?p v?i m?t tr?nh i?u khi?n ANSI. Lu ? r?ng cc nh cung c?p ODBC Microsoft .NET tr? v? "NO_DATA" khi v?n ? ny x?y ra.

Cc b?c ? sao chp cc hnh vi

M?u b?n ?a sau ch?ng t? v?n ?:
  1. S? d?ng k?ch b?n sau y ? t?o ra m?t b?ng v a ?a H? s:
    Create Table Test (ID integer, COL1 CHAR(10))
    Insert Into Test VALUES (1,'')
  2. Ch?y chng tr?nh C sau y:
    #include <windows.h>
    #include <stdio.h>
    #include <sql.h>
    #include <sqlext.h>
    int main(int argc, char* argv[])
    	SQLCHAR*	theDiagState = new SQLCHAR[50];
    	SQLINTEGER	theNativeState;
    	SQLCHAR*	theMessageText  = new SQLCHAR[255];
    	SQLSMALLINT	iOutputNo;
    	SQLHENV		m_SQLEnvironment;
    	SQLHDBC		m_SQLConnection;
    	SQLHSTMT	m_SQLStatement;
    	SQLRETURN	iReturn;
    	long		lStrLen;
    	char		theData[1000];
    	iReturn = SQLAllocHandle(SQL_HANDLE_ENV,SQL_NULL_HANDLE,&m_SQLEnvironment);
    	iReturn = SQLSetEnvAttr(m_SQLEnvironment,SQL_ATTR_ODBC_VERSION,(SQLPOINTER) SQL_OV_ODBC3,0);
    	iReturn = SQLAllocHandle(SQL_HANDLE_DBC,m_SQLEnvironment,&m_SQLConnection);
    	char	szConnBuffer[1024];
    	short   cbOutConn;
    	char    szConnStr[255];
    	iReturn= SQLDriverConnect(m_SQLConnection, NULL,
    (SQLTCHAR*) szConnStr,strlen(szConnStr), 
    (SQLCHAR*) szConnBuffer,1024, &cbOutConn, SQL_DRIVER_NOPROMPT);
    	if (iReturn != SQL_SUCCESS)
    	//Run query.
    	iReturn = SQLAllocHandle(SQL_HANDLE_STMT,m_SQLConnection,&m_SQLStatement);
    	//The Test table contains COL1 column which is set to empty for the first record.
    	iReturn = SQLExecDirect(m_SQLStatement, (SQLCHAR*) "Select ID,COL1 FROM Test",SQL_NTS);
    	iReturn = SQLFetch(m_SQLStatement);
    	iReturn = SQLGetData(m_SQLStatement,2,SQL_C_WCHAR,theData,100,&lStrLen);
    	//The problem does not occur if you bind the same column to SQL_C_CHAR.
    	//iReturn = SQLGetData(m_SQLStatement,2,SQL_C_CHAR,theData,100,&lStrLen);
    	if (iReturn != SQL_SUCCESS)
    		//iReturn will be 100 SQL_NO_DATA_FOUND here with NO other message.
    		int CheckHere;
    		CheckHere = 0;  //It will come here.
    		if (iReturn == SQL_NO_DATA_FOUND)
    			printf("SQL_NO_DATA_FOUND has been returned.\n Press Enter key to continue...\n");
    	iReturn = SQLFreeHandle(SQL_HANDLE_STMT,m_SQLStatement);
    	iReturn = SQLDisconnect(m_SQLConnection);
    	iReturn = SQLFreeHandle(SQL_HANDLE_DBC,m_SQLConnection);
    	iReturn = SQLFreeHandle(SQL_HANDLE_ENV,m_SQLEnvironment);
    	m_SQLStatement = NULL;
    	m_SQLConnection = NULL;
    	m_SQLEnvironment = NULL;
    	delete theMessageText; 
    	delete theDiagState;
    	return 1;
    B?n nh?n ?c thng bo sau:
    SQL_NO_DATA_FOUND ? ?c tr? l?i.
    B?m phm Enter ? ti?p t?c...

Thu?c tnh

ID c?a bi: 319243 - L?n xem xt sau cng: 28 Thang Sau 2013 - Xem xt l?i: 3.0
p d?ng
  • Microsoft Data Access Components 2.7
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