📄 valueread_setlongorlobreadermode.html
字号:
<html><head><meta name="KEYWORDS" content=" library, C++, Oracle, SQLServer, DB2, Sybase, Informix, InterBase, SQLBase, ODBC,
SQL, server, client, database, programming, development, software,
Win32, Windows, Linux, Unix, Solaris,
Microsoft, Borland, Centura, Gupta, IBM"><meta name="DESCRIPTION" content=
"SQLAPI++ is C++ library for accessing SQL databases (Oracle, SQLServer, Sybase, DB2, InterBase, SQLBase, Informix, ODBC).
It uses native APIs, provides low-level access to database-specific features."><title>SQLAPI++ Library - Online Documentation - SAValueRead::setLongOrLobReaderMode</title></head><body bgcolor="#ffffff" BACKGROUND="../images/bg.gif" text="#000000"><!--GlbHdr--> <table WIDTH="600" height="40" frame="hsides" BORDER="2" BORDERCOLOR="#004fcd" align="right" cellpadding="0" cellspacing="2" id="TABLE1">
<tr><!--class="GlbDefault"-->
<td width="70" bgcolor="#000094" bordercolor="black" align="middle"><A href="/index.html" style="TEXT-DECORATION: none">
<font color="white" size="3" face="sans-serif">
<b>Home</b></font></A></td></TD>
<td width="70" bgcolor="#000094" bordercolor="black" align="middle"><A href="/HowTo/index.html" style="TEXT-DECORATION: none"> <font color="white" size="3" face="sans-serif">
<b>How To</b></font></A></td><!--class="GlbActive"-->
<td width="70" bgcolor="#00bb00" bordercolor="black" align="middle"><A href="/OnLineDoc/index.html" style="TEXT-DECORATION: none"> <font color="white" size="3" face="sans-serif">
<b>Online Documentation</b></font></A></td><!--class="GlbDefault"-->
<td width="70" bgcolor="#000094" bordercolor="black" align="middle"><A href="/Support/index.html" style="TEXT-DECORATION: none"> <font color="white" size="3" face="sans-serif">
<b>Support</b></font></A></td>
<td width=70 bgcolor=#000094 bordercolor=black align=middle><A href="/Download/index.html" style="TEXT-DECORATION: none" >
<font color=white size=3 face=sans-serif>
<b>Download</b></font></A></td>
<td width="70" bgcolor="#000094" bordercolor="black" align="middle"><A href="/Order/index.html" style="TEXT-DECORATION: none"> <font color="white" size="3" face="sans-serif">
<b>Order</b></font></A></td> </tr>
</table>
<p> </p>
<p> </p>
<table width="100%">
<tr>
<td valign="top" width="165"><!--LeftMenu-->
<table frame="void" CELLSPACING="5" width="165">
<tr><td><p> </p></td>
</tr>
<tr>
<td><img align="middle" src="../images/green.gif" WIDTH="12" HEIGHT="12"><A href="Command.html" style="TEXT-DECORATION: none">
<font color="white" size="2" face="sans-serif">
SACommand</A> </FONT> </td>
</tr>
<tr>
<td><img align="middle" src="../images/green.gif" WIDTH="12" HEIGHT="12"><A href="Connection.html" style="TEXT-DECORATION: none">
<font color="white" size="2" face="sans-serif">
SAConnection</A> </FONT> </td>
</tr>
<tr>
<td><img align="middle" src="../images/green.gif" WIDTH="12" HEIGHT="12"><A href="Exception.html" style="TEXT-DECORATION: none">
<font color="white" size="2" face="sans-serif">
SAException</font></A> </td>
</tr>
<tr>
<td><img align="middle" src="../images/green.gif" WIDTH="12" HEIGHT="12"><A href="Field.html" style="TEXT-DECORATION: none">
<font color="white" size="2" face="sans-serif">
SAField</A> </FONT> </td>
</tr>
<tr>
<td><img align="middle" src="../images/green.gif" WIDTH="12" HEIGHT="12"><A href="Param.html" style="TEXT-DECORATION: none">
<font color="white" size="2" face="sans-serif">
SAParam</A> </FONT> </td>
</tr>
<tr><td><hr></td></tr>
<tr>
<td><img align=middle src="../images/green.gif" WIDTH="12" HEIGHT="12">
<A href="String.html" style ="TEXT-DECORATION: none" >
<font color=white size=2 face=sans-serif>
SAString</A> </FONT> </td>
</tr>
<tr>
<td><img align=middle src="../images/green.gif" WIDTH="12" HEIGHT="12">
<A href="DateTime.html" style ="TEXT-DECORATION: none" >
<font color=white size=2 face=sans-serif>
SADateTime</A> </FONT> </td>
</tr>
<tr>
<td><img align=middle src="../images/green.gif" WIDTH="12" HEIGHT="12">
<A href="Numeric.html" style ="TEXT-DECORATION: none" >
<font color=white size=2 face=sans-serif>
SANumeric</A> </FONT> </td>
</tr>
<tr><td><hr></td></tr>
<tr>
<td>
<A href="Enums.html" style ="TEXT-DECORATION: none" >
<font color=white size=2 face=sans-serif>
Enums and Typedefs</A> </FONT> </td>
</tr>
</table>
</td><!--empty column-->
<td width="20">
<p> </p>
</td><!--Content-->
<td valign="top" align="left">
<table width="100%" cellspacing="2" cellpadding="2">
<tr>
<td align="left"><A href="ValueRead_Usage.html" style="TEXT-DECORATION: none"><h3>Usage</h3></A>
</td>
<td align="left"><A href="ValueRead.html" style="TEXT-DECORATION: none"><h3>Class Members</h3></A>
</td>
<td align="left"><A href="ValueRead_Examples.html" style="TEXT-DECORATION: none"><h3>Examples</h3></A>
</td>
</tr>
<tr>
<td colspan="3"><h1>SAValueRead::setLongOrLobReaderMode</h1></td>
</tr>
</table>
<p><font face="Arial"><b> void setLongOrLobReaderMode( </b>
<STRONG>SALongOrLobReaderModes_t</STRONG> eMode<b> ) const; </b></font></p>
<p>
Sets Long or Lob data reading
mode.
</p>
<h3>Parameters</h3>
<P><EM>eMode</EM> .
Can be one of the following <STRONG>SALongOrLobReaderModes_t</STRONG> enum values: </P>
<UL><STRONG><STRONG
>
<LI><STRONG>SA_LongOrLobReaderDefault</STRONG></STRONG></STRONG>
Long
or Lob(CLob) data reading mode is default (automatic).<STRONG
><STRONG>
<LI><STRONG>SA_LongOrLobReaderManual</STRONG></STRONG></STRONG>
Long or Lob(CLob) data reading mode is manual.<STRONG
><STRONG>
</STRONG></STRONG></LI></UL>
<h3>Remarks</h3>
<P>SQLAPI++ Library provides two ways to read Long or
BLob(CLob) object's value (usually <A href="Field.html">SAField</A>
or <A href="Param.html">SAParam</A>
object):</P>
<OL>
<LI>reading of Long or Lob data at once into
an internal buffer (like ordinary string or binary values);
<LI>piecewise reading of Long or Lob data using user defined
callback.</LI></OL>
<P><STRONG>SA_LongOrLobReaderDefault</STRONG></STRONG></STRONG> reading
mode used by
default. </P>
<P>If you want to control piecewise reading of
Long or BLob(CLob) data you should call
<STRONG>setLongOrLobReaderMode</STRONG>
method and set <STRONG
>SA_LongOrLobReaderManual</STRONG> reading
mode for Long or BLob(CLob) parameters or fields you want to process
with user defined callback. After that each
fetch
will skip reading Long and BLob(CLob) parameters that you set to be
read manually. To read field or parameter defined to be read
manually you
should call <STRONG>ReadLongOrLob</STRONG>
method for each of them after
the fetch. <STRONG>ReadLongOrLob</STRONG>
method will repeatedly call user
defined callback declared by
<A href="Enums.html#saLongOrLobReader_t" >saLongOrLobReader_t typedef</A>. To get more details about reading Long and BLob(CLob)
data see <A
href="Field_ReadLongOrLob.html">SAField::ReadLongOrLob</A>,
<A
href="Param_ReadLongOrLob.html">SAParam::ReadLongOrLob</A>
methods and <A href="../Examples/step6.cpp" >Query
examples - Step 6</A>
.</P>
<P>To check current object's data reading mode
use <A
href="ValueRead_LongOrLobReaderMode.html">LongOrLobReaderMode</A>
method.</P>
<h3>Server specific notes</h3>
<P>No specific information.</P>
<h3> See also</h3>
<P><A
href="ValueRead_LongOrLobReaderMode.html">SAValueRead::LongOrLobReaderMode</A>
, <A href="Field_ReadLongOrLob.html">SAField::ReadLongOrLob</A>,
<A
href="Param_ReadLongOrLob.html">SAParam::ReadLongOrLob</A>
</P>
<P><A href="Field.html">SAField</A>, <A
href="Param.html">SAParam</A>
</P>
<P><A
href="Enums.html#SALongOrLobReaderModes_t">SALongOrLobReaderModes_t</A>
</P>
<P><A href="../Examples/step6.cpp" >Query
examples - Step 6</A>
</P>
<h3>Problems and Questions</h3>
<p> If
you haven't found the answer to your questions or
have some problems on using the Library, please, send e-mail to <A href="mailto:howto@sqlapi.com">howto@sqlapi.com</A>.
</p>
</td>
<tr></tr>
</table>
</body></html>⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -