1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
<!--plsfield:text-->
<HTML><HEAD>
<TITLE>C API Reference -- Ns_DbSelect</TITLE>
<LINK rel=Previous href="c-ch153.htm">
<LINK rel=ToC href="toc.htm">
<LINK rel=Index href="master.htm">
<LINK rel=Next href="c-ch155.htm">
</HEAD><BODY BGCOLOR="#ffffff"><A NAME="topofpage"></A>
<TABLE WIDTH=100%>
<TR>
<TD ALIGN=LEFT>
<A NAME="topofpage"></A> <IMG SRC="as-c-sm.gif">
</TD>
<TD ALIGN=RIGHT>
<A href="c-ch153.htm"><IMG BORDER="0" src=navbprev.gif alt="[ Previous ]"></A>
<A href=toc.htm> <IMG BORDER="0" src=navbhome.gif alt="[ Contents ]"></A>
<A href=master.htm> <IMG BORDER="0" src=navbhelp.gif alt="[ Index ]"></A>
<A href="c-ch155.htm"> <IMG BORDER="0" src=navbnext.gif alt="[ Next ]"></A>
<A name="7983"> </A>
</TD>
</TR>
</TABLE>
<a name="117068">
</a><h3>Ns_DbSelect</h3>
<a name="117069">
</a><h4>Overview</h4>
Send a row-generating query to the database
<a name="78067">
</a><a name="132794">
</a><h4>Syntax</h4>
<pre> <a name="78069"></a>Ns_Set *Ns_DbSelect(
<a name="78070"></a>Ns_DbHandle *handle,
<a name="78071"></a>char *sql
<a name="78072"></a>);
</pre><p><a name="134155">
</a><h4>Description</h4>
<p><a name="78074">
</a>The Ns_DbSelect function executes the given SQL statement. It returns an Ns_Set where the field key names are the column names that were returned by the select statement on success. The field values are NULL until the first call to Ns_DbGetRow where they are replaced with the values of the first row fetched from the database. The set is statically allocated; do not free it with Ns_SetFree when your query is complete.</p>
<p><a name="78075">
</a>On error, Ns_DbSelect returns NULL. Detailed error message may have accumulated in an internal buffer in the Ns_DbHandle.</p>
<a name="225012">
</a><h4>Examples</h4>
<pre> <a name="225013"></a>Ns_DbHandle *handle;
<a name="225014"></a>if ((handle = Ns_DbPoolGetHandle("aPoolName")) != NULL) {
<a name="225015"></a> Ns_Set *row;
<a name="225016"></a> row = Ns_DbSelect(handle, "select * from aTable");
<a name="225030"></a> if (row == NULL) {
<a name="225031"></a> /*... handle select error ...*/
<a name="225032"></a> }
<a name="225033"></a> while ((status = Ns_DbGetRow(handle, row)) == NS_OK) {
<a name="225034"></a> /*... process the row fetched from the database ...*/
<a name="225035"></a> }
<a name="225036"></a> if (status != NS_END_DATA) {
<a name="225037"></a> /*... handle get row error ...*/
<a name="225038"></a> }
<a name="225018"></a> Ns_DbPoolPutHandle(handle); /* done with handle */
</pre><p><p><a name="225019">
</a>}</p>
<p><a name="225020">
</a></p>
<p><a name="225010">
</a></p>
<TABLE BORDER="2" CELLPADDING="1" width="100%">
<TR><TD COLSPAN=3><P ALIGN=Center>
<IMG SRC="bluebult.gif">
<A HREF="#topofpage">
<FONT SIZE=-1>Top of Page</FONT></A>
<IMG SRC="bluebult.gif">
</TD></TR>
<TR><TD COLSPAN=3><P ALIGN=Center>
<A href="c-ch153.htm">
<IMG BORDER="0" src=navbprev.gif alt="[ Previous ]"></A>
<A href=toc.htm>
<IMG BORDER="0" src=navbhome.gif alt="[ Contents ]"></A>
<A href=master.htm>
<IMG BORDER="0" src=navbhelp.gif alt="[ Index ]"></A>
<A href="c-ch155.htm">
<IMG BORDER="0" src=navbnext.gif alt="[ Next ]"></A>
<BR align=center>
<FONT size=-1>Copyright © 1998-99 America Online,
Inc.</FONT>
</TD></TR></TABLE></BODY></HTML><!--plsfield:end-->
|
