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POCan ColumnSize argument of ODBC SQLBindParameter be strlen(param) + 1 for SQLCHAR type parameter?
 

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  1. POCan ColumnSize argument of ODBC SQLBindParameter be strlen(param) + 1 for SQLCHAR type parameter?
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    <p>The example for SQLBindParameter function 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 as the ColumnSize argument (6th argument) when the C type is <code>SQL_C_CHAR</code>.</p> <p>Quoting parts of the examples from that page:</p> <pre><code>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); </code></pre> <p>I want to know if it is okay to pass the length of the string parameter plus 1 as the ColumnSize argument. In other words, I want to know if the following call is okay if we assume that <code>szEmployeeID</code> contains a null-terminated string.</p> <pre><code>retcode = SQLBindParameter(hstmt, 1, SQL_PARAM_INPUT, SQL_C_CHAR, SQL_CHAR, strlen(szEmployeeID) + 1, 0, szEmployeeID, 0, &amp;cbEmployeeID); </code></pre> <p>I believe this can be very useful in calls like these:</p> <pre><code>SQLLEN nts = SQL_NTS; retcode = SQLBindParameter(hstmt, 1, SQL_PARAM_INPUT, SQL_C_CHAR, SQL_CHAR, 6, 0, "hello", 0, &amp;nts); char *domain = "stackoverflow.com"; retcode = SQLBindParameter(hstmt, 1, SQL_PARAM_INPUT, SQL_C_CHAR, SQL_CHAR, strlen(domain) + 1, 0, domain, 0, &amp;nts); </code></pre>
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    1. USSusam Pal
    1. USSusam Pal
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    1. COI noticed that even if I pass 0 as the 6th argument (ColumnSize argument), I get correct results. I tried a query of the form `SELECT * FROM some_table WHERE some_column = ?` on Sybase SQL Anywhere. So, it seems like this argument is ignored.
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      1. POCan ColumnSize argument of ODBC SQLBindParameter be strlen(param) + 1 for SQLCHAR type parameter?
      1. USSusam Pal
    2. COYes, this will work, I've used a similar approach when doing my own DB functions in C. It saves time and trouble.
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      1. USAlbert Perrien
    3. COHmm, I've never tried passing it 0 before, you say this works? I just always gave it a computed value.
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      1. USAlbert Perrien
 

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