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POWhat to pass as the ColumnSize argument of ODBC SQLBindParameter in a C/C++ program?
 

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  1. POWhat to pass as the ColumnSize argument of ODBC SQLBindParameter in a C/C++ program?
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    <p>I am learning how to use the <code>SQLBindParameter</code> function. I was going through a couple of examples on the Internet and it is not clear what I should be passing as the 6th argument to the <code>SQLBindParameter</code> function.</p> <p>The example at <a href="http://msdn.microsoft.com/en-us/library/ms710963(v=vs.85).aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/ms710963(v=vs.85).aspx</a> passes the size of the character array when the C type is <code>SQL_C_CHAR</code> and 0 when the C type is <code>SQL_C_SSHORT</code>.</p> <pre><code>SQLSMALLINT sCustID; SQLCHAR szEmployeeID[EMPLOYEE_ID_LEN]; SQL_DATE_STRUCT dsOrderDate; SQLINTEGER cbCustID = 0, cbOrderDate = 0, cbEmployeeID = SQL_NTS; </code></pre> <p>...</p> <pre><code>retcode = SQLBindParameter(hstmt, 1, SQL_PARAM_INPUT, SQL_C_CHAR, SQL_CHAR, EMPLOYEE_ID_LEN, 0, szEmployeeID, 0, &amp;cbEmployeeID); retcode = SQLBindParameter(hstmt, 2, SQL_PARAM_INPUT, SQL_C_SSHORT, SQL_INTEGER, 0, 0, &amp;sCustID, 0, &amp;cbCustID); </code></pre> <p>However, an example at <a href="http://publib.boulder.ibm.com/infocenter/db2e/v8r2/index.jsp?topic=%2Fcom.ibm.db2e.doc%2Fdbeapc1702.html" rel="nofollow">http://publib.boulder.ibm.com/infocenter/db2e/v8r2/index.jsp?topic=%2Fcom.ibm.db2e.doc%2Fdbeapc1702.html</a> passes 0 for SQL_C_TCHAR and some positive integers for SQL_C_LONG.</p> <pre><code>long p1 = 10; short p2 = 100; TCHAR p3[100]; </code></pre> <p>...</p> <pre><code>// bind input parameters rc = SQLBindParameter(hstmt, (unsigned short)1, SQL_PARAM_INPUT, SQL_C_LONG, SQL_INTEGER, 4, 0, &amp;p1, sizeof(p1), &amp;len); // check return code ... rc = SQLBindParameter(hstmt, (unsigned short)2, SQL_PARAM_INPUT, SQL_C_LONG, SQL_SMALLINT, 2, 0, &amp;p2, sizeof(p2), &amp;len); // check return code ... len = SQL_NTS; rc = SQLBindParameter(hstmt, (unsigned short)3, SQL_PARAM_INPUT, SQL_C_TCHAR, SQL_CHAR, 0, 0, &amp;p3[0], 100, &amp;len); </code></pre> <p>Could someone please clarify how exactly do we decide the parameters to be passed into <code>SQLBindParameter</code>?</p>
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