7. Understanding ODBC Connectivity : ODBC Programming : Database Procedure Execution : Database Procedures with Input Parameters
 
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Database Procedures with Input Parameters
Input parameters are sent to the database procedure but not returned to the application. The following example shows how input parameters are used:
SQLINTEGER retval = 500;
SQLINTEGER orind = 0;
 
SQLBindParameter( hstmt,  /* Statement handle */
    1,                    /* Parameter number */
    SQL_PARAM_INPUT,      /* It's an input parameter */
    SQL_C_LONG,           /* Source data is an integer */
    SQL_INTEGER,          /* Target column is an integer */
    0,                    /* Length not required */
    0,                    /* Precision not required */
    &inputVal,            /* The data itself */
    0,                    /* Max length not required */
    &orind1);             /* Indicator can be zero */
 
SQLExecDirect( hstmt, "{ call myDbProc ( ? ) }", SQL_NTS );
Note that the ParameterType argument for "inputVal" is now SQL_PARAM_INPUT. The parameter marker "?" is now designated as an input parameter to myDbProc by placing it within the parentheses after myDbProc.