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POexactly what does the statement handle(hstmt) do? in ODBC
 

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  1. POexactly what does the statement handle(hstmt) do? in ODBC
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    <p>I`m new to write c code for ODBC but here I have question... after searching for the tutorial for odbc function tutorials for C, I still caanot get exactly how they work collaborately...</p> <p>what does the statement handle hstmt exactly do for database data? I knew it controls the SQL query statements that I give as a parameter. but,, then every SQL statements that i give as query should have each statement handle(hstmt) for each of them? or one statement handle for several SQL query statements?</p> <p>for example,</p> <pre><code>lstrcpy((LPTSTR)update, L"insert into employee values ('Dshong','summer','LosAngeles');"); SQLExecDirect(hstmt1, update, SQL_NTS); lstrcpy((LPTSTR)update, L"insert into works values ('Dshong','Small Bank', 2500);"); SQLExecDirect(hstmt3, update1, SQL_NTS); lstrcpy((LPTSTR)select, L"select * from works;"); if (SQLExecDirect(hstmt, select, SQL_NTS) != SQL_SUCCESS) return printf("can’t exec direct"); lstrcpy((LPTSTR)select1, L"select * from employee;"); if (SQLExecDirect(hstmt2, select1, SQL_NTS) != SQL_SUCCESS) return printf("can’t exec direct"); </code></pre> <p>should I give like this for two insert statements and two select statements with four hstmt?</p> <p>and if I give like this,</p> <pre><code>lstrcpy((LPTSTR)insert, L"insert into employee values ('Dshong','summer','LosAngeles');"); SQLExecDirect(hstmt1, insert, SQL_NTS); </code></pre> <p>the SQLExecDirect has hstmt1 as parameter but I don`t know how SQLExecDirect works with it..</p> <p>And as I think, the result should be one line inserted, isnt it?</p> <p>but when I run the code, it inserts multi-same rows for <code>('Dshong','summer','LosAngeles')</code>... when I printed out the result, <code>('Dshong','summer','LosAngeles')</code> was inserted multiple times even though the insert line was not in the for loop or so...</p> <p>and how they work together with the functions below? </p> <ul> <li><code>SQLBindCol(hstmt, 1, SQL_C_CHAR, id, (SDWORD)sizeof(id), &amp;idlen);</code></li> <li><code>SQLFetch(hstmt)</code></li> </ul> <p>I know what they simply doing but.. here I want to know exactly in which way hstmt ( statement handle) work with them..</p> <p>thank you.. :)</p>
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