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<html><head><meta name="KEYWORDS" content=" library, C++, Oracle, SQLServer, DB2, Sybase, Informix, InterBase, SQLBase, ODBC,
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"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 - Server Specific Guide - DB2</title></head><body bgcolor="#ffffff" BACKGROUND="../images/bg.gif" text="#000000"><!--class="GlbHdr"-->
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<H2><A href="index.html">Server Specific Guide</A></H2>
<h1>DB2</h1>
<P align=left>SQLAPI++ allows to work with a number of SQL database
servers. It provides common mechanisms to access database, and as a
general rule they work for any database server. But each server has
some specific features which developer has to know to use all
server's capability and avoid potential errors.</P>
<P align=left>This page collects all <STRONG>specific</STRONG> information that concerns
working with <STRONG>DB2</STRONG>
server using SQLAPI++
Library. Full information about using SQLAPI++ see in <A
href="../HowTo/index.html">How To</A>
and <A
href="../OnLineDoc/index.html">Online Documentation</A>
.
</P>
<P align=left>Available topics:
</P>
</center>
<P><A
href="DB2.html#Connecting to a database">Connecting to a
database</A></P>
<P><A
href="DB2.html#Transaction isolation levels">Transaction
isolation levels</A></P>
<P><A
Lob(CLob, BLob) data</A></P>
<P><A
href="DB2.html#Returning output parameters">Returning output parameters</A></P>
<P><A
href="DB2.html#Cancelling queries">Cancelling queries</A></P>
<P><A
href="DB2.html#Connection and command options">Connection and
command options</A></P>
<P><A
href="DB2.html#Getting native DB2 API"> Getting native DB2 API</A></P>
<P><A
href="DB2.html#Getting native DB2 connection related handles"> Getting native DB2 connection related
handles</A></P>
<P><A
href="DB2.html#Getting native DB2 command related handles"> Getting native DB2 command related
handles</A></P>
<P><A href="DB2.html#Error handling">Error
handling</A></P>
<P><A href="DB2.html#Special header files - Compile time">Special header files - Compile time</A></P>
<P> </P>
<H3><A
name="Connecting to a database">Connecting to a database</A> </H3>
<p>To connect to a database you should create a
connection object and then connect it. A connection object is
represented by <A href="../OnLineDoc/Connection.html" >SAConnection</A>
class. After the connection is created you need to connect it to
<STRONG>DB2</STRONG>
server using <A href="../OnLineDoc/Connection_Connect.html" >SAConnection::Connect</A>
method</p>
<p><font face=Arial><b
>void Connect( const SAString
&</b>sDBString<b>, const SAString
&</b>sUserID<b>, const SAString
&</b>sPassword<b>, SAClient_t</b>
eSAClient<b> = SA_Client_NotSpecified );</b><b
> <BR></b></font></p>
<p>with the following parameters:</p>
<P><EM>sDBString.</EM> Any valid
<STRONG>DB2</STRONG> connection
string.<BR><EM>sUserID.</EM> A string containing a user name
to use when establishing the connection.<BR><EM>sPassword.</EM> A string containing a
password to use when establishing the connection.<BR><EM>eSAClient.</EM> Optional. One of the
following values from <STRONG>SAClient_t</STRONG>
enum:</P>
<UL>
<LI><STRONG>SA_DB2_Client</STRONG>
DB2 client.
<LI><STRONG>SA_Client_NotSpecified</STRONG>
Used by default if <EM>eSAClient</EM>parameter is
omitted. You can use this default value only if you have
call <A
href="../OnLineDoc/Connection_setClient.html">SAConnection::setClient</A>
method with <STRONG>SA_DB2_Client</STRONG>
constant before.</LI>
</UL>
<P>The SQLAPI++ Library requires DB2 CLI
version 6.x or higher.</P>
<P>For more details see <A
href="../HowTo/connect.html">How To - Connecting to databases</A>, <A
href="../OnLineDoc/Connection_Usage.html">SAConnection object</A>, <A
href="../OnLineDoc/Connection_Connect.html">SAConnection::Connect</A>.</P>
<P> </P>
<H3><A
name="Transaction isolation levels">Transaction isolation
levels</A> </H3>
<P>SQL-92 defines four isolation levels, all of
which are supported by SQLAPI++:</P>
<UL>
<LI>Read uncommitted (the lowest level where
transactions are isolated just enough to ensure that physically
corrupt data is not read)
<LI>Read committed
<LI>Repeatable read
<LI>Serializable (the highest level, where
transactions are completely isolated from one another)</LI></UL>
<P>SQLAPI++ maps different isolation levels on
<STRONG>DB2</STRONG> server in the following way:</P>
<P> <STRONG
>SA_ReadUncommitted</STRONG> = SQL_TXN_READ_UNCOMMITTED
('Uncommited
Read')<BR><STRONG> SA_ReadCommitted</STRONG> =
SQL_TXN_READ_COMMITTED
('Cursor Stability')<BR><STRONG> SA_RepeatableRead</STRONG> = SQL_TXN_REPEATABLE_READ ('Repeatable
Read')<BR><STRONG> SA_Serializable</STRONG> = SQL_TXN_SERIALIZABLE
('Read
Stability')</P>
<P>For more details see <A
href="../OnLineDoc/Connection_setIsolationLevel.html">SAConnection::setIsolationLevel</A>.</P>
<P> </P>
<H3><A
name="Working with Long or Lob(CLob, BLob) data">Working with Long or Lob(CLob,
BLob) data</A> </H3>
<P>
SQLAPI++ supports four types for working with
Long or Lob(CLob, BLob) data:</P>
<P>
<TABLE border=1 cellPadding=1 cellSpacing=1 style="WIDTH: 100%"
width=100%>
<TR bgColor=navy>
<TD><FONT color=white
style="BACKGROUND-COLOR: #000080">Name</FONT></TD>
<TD><FONT color=white
style="BACKGROUND-COLOR: #000080">C
enum constant</FONT></TD>
</TR>
<TR>
<TD>LongBinary</TD>
<TD>SA_dtLongBinary</TD>
</TR>
<TR>
<TD>LongChar</TD>
<TD>SA_dtLongChar</TD>
</TR>
<TR>
<TD>BLob (Binary Large object)</TD>
<TD>SA_dtBLob</TD>
</TR>
<TR>
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