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7org.apache.hadoop.mapred.lib.db (Hadoop 0.20.1 API)
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82<H2>
83Package org.apache.hadoop.mapred.lib.db
84</H2>
85org.apache.hadoop.mapred.lib.db Package
86<P>
87<B>See:</B>
88<BR>
89&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<A HREF="#package_description"><B>Description</B></A>
90<P>
91
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94<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
95<B>Interface Summary</B></FONT></TH>
96</TR>
97<TR BGCOLOR="white" CLASS="TableRowColor">
98<TD WIDTH="15%"><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBWritable.html" title="interface in org.apache.hadoop.mapred.lib.db">DBWritable</A></B></TD>
99<TD>Objects that are read from/written to a database should implement
100 <code>DBWritable</code>.</TD>
101</TR>
102</TABLE>
103&nbsp;
104
105<P>
106
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110<B>Class Summary</B></FONT></TH>
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113<TD WIDTH="15%"><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBConfiguration.html" title="class in org.apache.hadoop.mapred.lib.db">DBConfiguration</A></B></TD>
114<TD>A container for configuration property names for jobs with DB input/output.</TD>
115</TR>
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117<TD WIDTH="15%"><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBInputFormat.html" title="class in org.apache.hadoop.mapred.lib.db">DBInputFormat&lt;T extends DBWritable&gt;</A></B></TD>
118<TD>A InputFormat that reads input data from an SQL table.</TD>
119</TR>
120<TR BGCOLOR="white" CLASS="TableRowColor">
121<TD WIDTH="15%"><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBInputFormat.DBInputSplit.html" title="class in org.apache.hadoop.mapred.lib.db">DBInputFormat.DBInputSplit</A></B></TD>
122<TD>A InputSplit that spans a set of rows</TD>
123</TR>
124<TR BGCOLOR="white" CLASS="TableRowColor">
125<TD WIDTH="15%"><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBInputFormat.NullDBWritable.html" title="class in org.apache.hadoop.mapred.lib.db">DBInputFormat.NullDBWritable</A></B></TD>
126<TD>A Class that does nothing, implementing DBWritable</TD>
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129<TD WIDTH="15%"><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBOutputFormat.html" title="class in org.apache.hadoop.mapred.lib.db">DBOutputFormat&lt;K extends DBWritable,V&gt;</A></B></TD>
130<TD>A OutputFormat that sends the reduce output to a SQL table.</TD>
131</TR>
132</TABLE>
133&nbsp;
134
135<P>
136<A NAME="package_description"><!-- --></A><H2>
137Package org.apache.hadoop.mapred.lib.db Description
138</H2>
139
140<P>
141<h2>org.apache.hadoop.mapred.lib.db Package</h2>
142<p>
143This package contains a library to read records from a database as an
144input to a mapreduce job, and write the output records to the database.   
145</p>
146<p>
147The Database to access can be configured using the static methods in the
148DBConfiguration class. Jobs reading input from a database should use
149DBInputFormat#setInput() to set the configuration. And jobs writing
150its output to the database should use DBOutputFormat#setOutput().
151</p>
152<p> 
153Tuples from/to the database are converted to/from Java objects using
154DBWritable methods. Typically, for each table in the db, a class extending
155DBWritable is defined, which holds the fields of the tuple. The fields
156of a record are read from the database using DBWritable#readFields(ResultSet),
157and written to the database using DBWritable#write(PreparedStatament
158statement).
159</p>
160<p>
161An example program using both DBInputFormat and DBOutputFormat can be found
162at src/examples/org/apache/hadoop/examples/DBCountPageview.java.
163</p>
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