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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN""http://www.w3.org/TR/REC-html40/frameset.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc on Thu Apr 27 23:36:18 PDT 2000 --><TITLE>Java 2 Platform SE v1.3: Interface Blob</TITLE><LINK REL ="stylesheet" TYPE="text/css" HREF="../../stylesheet.css" TITLE="Style"></HEAD><BODY BGCOLOR="white"><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_top"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/Blob.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../index-files/index-1.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM><b>Java<sup><font size=-2>TM</font></sup> 2 Platform<br>Std. Ed. v1.3</b></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../java/sql/Array.html"><B>PREV CLASS</B></A> <A HREF="../../java/sql/CallableStatement.html"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../index.html" TARGET="_top"><B>FRAMES</B></A> <A HREF="Blob.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: INNER | FIELD | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | CONSTR | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><!-- =========== END OF NAVBAR =========== --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">java.sql</FONT><BR>Interface Blob</H2><HR><DL><DT>public interface <B>Blob</B></DL><P>The representation (mapping) in the Java<sup><font size=-2>TM</font></sup> programming language of an SQL <code>BLOB</code> value. An SQL <code>BLOB</code> is a built-in type that stores a Binary Large Object as a column value in a row of a database table. The driver implements <code>Blob</code> using an SQL <code>locator(BLOB)</code>, which means that a <code>Blob</code> object contains a logical pointer to the SQL <code>BLOB</code> data rather than the data itself. A <code>Blob</code> object is valid for the duration of the transaction in which is was created. <P>Methods in the interfaces <A HREF="../../java/sql/ResultSet.html"><CODE>ResultSet</CODE></A>, <A HREF="../../java/sql/CallableStatement.html"><CODE>CallableStatement</CODE></A>, and <A HREF="../../java/sql/PreparedStatement.html"><CODE>PreparedStatement</CODE></A>, such as <code>getBlob</code> and <code>setBlob</code> allow a programmer to access an SQL <code>BLOB</code> value. The <code>Blob</code> interface provides methods for getting the length of an SQL <code>BLOB</code> (Binary Large Object) value, for materializing a <code>BLOB</code> value on the client, and for determining the position of a pattern of bytes within a <code>BLOB</code> value. <P> This class is new in the JDBC 2.0 API.<P><DL><DT><B>Since: </B><DD>1.2</DD></DL><HR><P><!-- ======== INNER CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><!-- ======== CONSTRUCTOR SUMMARY ======== --><!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Method Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../java/io/InputStream.html">InputStream</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../java/sql/Blob.html#getBinaryStream()">getBinaryStream</A></B>()</CODE><BR> Retrieves the <code>BLOB</code> designated by this <code>Blob</code> instance as a stream.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> byte[]</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/sql/Blob.html#getBytes(long, int)">getBytes</A></B>(long pos, int length)</CODE><BR> Returns as an array of bytes, part or all of the <code>BLOB</code> value that this <code>Blob</code> object designates.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> long</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/sql/Blob.html#length()">length</A></B>()</CODE><BR> Returns the number of bytes in the <code>BLOB</code> value designated by this <code>Blob</code> object.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> long</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/sql/Blob.html#position(java.sql.Blob, long)">position</A></B>(<A HREF="../../java/sql/Blob.html">Blob</A> pattern, long start)</CODE><BR> Determines the byte position in the <code>BLOB</code> value designated by this <code>Blob</code> object at which <code>pattern</code> begins.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> long</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/sql/Blob.html#position(byte[], long)">position</A></B>(byte[] pattern, long start)</CODE><BR> Determines the byte position at which the specified byte <code>pattern</code> begins within the <code>BLOB</code> value that this <code>Blob</code> object represents.</TD>⌨️ 快捷键说明
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