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7DBOutputFormat (Hadoop 0.20.1 API)
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90<FONT SIZE="-1">
91org.apache.hadoop.mapred.lib.db</FONT>
92<BR>
93Class DBOutputFormat&lt;K extends <A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBWritable.html" title="interface in org.apache.hadoop.mapred.lib.db">DBWritable</A>,V&gt;</H2>
94<PRE>
95<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A>
96  <IMG SRC="../../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.mapred.lib.db.DBOutputFormat&lt;K,V&gt;</B>
97</PRE>
98<DL>
99<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../../../org/apache/hadoop/mapred/OutputFormat.html" title="interface in org.apache.hadoop.mapred">OutputFormat</A>&lt;K,V&gt;</DD>
100</DL>
101<HR>
102<DL>
103<DT><PRE>public class <B>DBOutputFormat&lt;K extends <A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBWritable.html" title="interface in org.apache.hadoop.mapred.lib.db">DBWritable</A>,V&gt;</B><DT>extends <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A><DT>implements <A HREF="../../../../../../org/apache/hadoop/mapred/OutputFormat.html" title="interface in org.apache.hadoop.mapred">OutputFormat</A>&lt;K,V&gt;</DL>
104</PRE>
105
106<P>
107A OutputFormat that sends the reduce output to a SQL table.
108 <p> 
109 <A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBOutputFormat.html" title="class in org.apache.hadoop.mapred.lib.db"><CODE>DBOutputFormat</CODE></A> accepts &lt;key,value&gt; pairs, where
110 key has a type extending DBWritable. Returned <A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBOutputFormat.DBRecordWriter.html" title="class in org.apache.hadoop.mapred.lib.db"><CODE>DBOutputFormat.DBRecordWriter</CODE></A> 
111 writes <b>only the key</b> to the database with a batch SQL query.
112<P>
113
114<P>
115<HR>
116
117<P>
118<!-- ======== NESTED CLASS SUMMARY ======== -->
119
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124<B>Nested Class Summary</B></FONT></TH>
125</TR>
126<TR BGCOLOR="white" CLASS="TableRowColor">
127<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
128<CODE>protected &nbsp;class</CODE></FONT></TD>
129<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBOutputFormat.DBRecordWriter.html" title="class in org.apache.hadoop.mapred.lib.db">DBOutputFormat.DBRecordWriter</A></B></CODE>
130
131<BR>
132&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A RecordWriter that writes the reduce output to a SQL table</TD>
133</TR>
134</TABLE>
135&nbsp;
136<!-- ======== CONSTRUCTOR SUMMARY ======== -->
137
138<A NAME="constructor_summary"><!-- --></A>
139<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
140<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
141<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
142<B>Constructor Summary</B></FONT></TH>
143</TR>
144<TR BGCOLOR="white" CLASS="TableRowColor">
145<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBOutputFormat.html#DBOutputFormat()">DBOutputFormat</A></B>()</CODE>
146
147<BR>
148&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
149</TR>
150</TABLE>
151&nbsp;
152<!-- ========== METHOD SUMMARY =========== -->
153
154<A NAME="method_summary"><!-- --></A>
155<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
156<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
157<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
158<B>Method Summary</B></FONT></TH>
159</TR>
160<TR BGCOLOR="white" CLASS="TableRowColor">
161<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
162<CODE>&nbsp;void</CODE></FONT></TD>
163<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBOutputFormat.html#checkOutputSpecs(org.apache.hadoop.fs.FileSystem, org.apache.hadoop.mapred.JobConf)">checkOutputSpecs</A></B>(<A HREF="../../../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;filesystem,
164                 <A HREF="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job)</CODE>
165
166<BR>
167&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Check for validity of the output-specification for the job.</TD>
168</TR>
169<TR BGCOLOR="white" CLASS="TableRowColor">
170<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
171<CODE>protected &nbsp;<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A></CODE></FONT></TD>
172<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBOutputFormat.html#constructQuery(java.lang.String, java.lang.String[])">constructQuery</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;table,
173               <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>[]&nbsp;fieldNames)</CODE>
174
175<BR>
176&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Constructs the query used as the prepared statement to insert data.</TD>
177</TR>
178<TR BGCOLOR="white" CLASS="TableRowColor">
179<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
180<CODE>&nbsp;<A HREF="../../../../../../org/apache/hadoop/mapred/RecordWriter.html" title="interface in org.apache.hadoop.mapred">RecordWriter</A>&lt;<A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBOutputFormat.html" title="type parameter in DBOutputFormat">K</A>,<A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBOutputFormat.html" title="type parameter in DBOutputFormat">V</A>&gt;</CODE></FONT></TD>
181<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBOutputFormat.html#getRecordWriter(org.apache.hadoop.fs.FileSystem, org.apache.hadoop.mapred.JobConf, java.lang.String, org.apache.hadoop.util.Progressable)">getRecordWriter</A></B>(<A HREF="../../../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;filesystem,
182                <A HREF="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job,
183                <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;name,
184                <A HREF="../../../../../../org/apache/hadoop/util/Progressable.html" title="interface in org.apache.hadoop.util">Progressable</A>&nbsp;progress)</CODE>
185
186<BR>
187&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get the <A HREF="../../../../../../org/apache/hadoop/mapred/RecordWriter.html" title="interface in org.apache.hadoop.mapred"><CODE>RecordWriter</CODE></A> for the given job.</TD>
188</TR>
189<TR BGCOLOR="white" CLASS="TableRowColor">
190<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
191<CODE>static&nbsp;void</CODE></FONT></TD>
192<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBOutputFormat.html#setOutput(org.apache.hadoop.mapred.JobConf, java.lang.String, java.lang.String...)">setOutput</A></B>(<A HREF="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job,
193          <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;tableName,
194          <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>...&nbsp;fieldNames)</CODE>
195
196<BR>
197&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Initializes the reduce-part of the job with the appropriate output settings</TD>
198</TR>
199</TABLE>
200&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
201<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
202<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
203<TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></B></TH>
204</TR>
205<TR BGCOLOR="white" CLASS="TableRowColor">
206<TD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
207</TR>
208</TABLE>
209&nbsp;
210<P>
211
212<!-- ========= CONSTRUCTOR DETAIL ======== -->
213
214<A NAME="constructor_detail"><!-- --></A>
215<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
216<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
217<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
218<B>Constructor Detail</B></FONT></TH>
219</TR>
220</TABLE>
221
222<A NAME="DBOutputFormat()"><!-- --></A><H3>
223DBOutputFormat</H3>
224<PRE>
225public <B>DBOutputFormat</B>()</PRE>
226<DL>
227</DL>
228
229<!-- ============ METHOD DETAIL ========== -->
230
231<A NAME="method_detail"><!-- --></A>
232<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
233<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
234<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
235<B>Method Detail</B></FONT></TH>
236</TR>
237</TABLE>
238
239<A NAME="constructQuery(java.lang.String, java.lang.String[])"><!-- --></A><H3>
240constructQuery</H3>
241<PRE>
242protected <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> <B>constructQuery</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;table,
243                                <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>[]&nbsp;fieldNames)</PRE>
244<DL>
245<DD>Constructs the query used as the prepared statement to insert data.
246<P>
247<DD><DL>
248</DL>
249</DD>
250<DD><DL>
251<DT><B>Parameters:</B><DD><CODE>table</CODE> - the table to insert into<DD><CODE>fieldNames</CODE> - the fields to insert into. If field names are unknown, supply an
252          array of nulls.</DL>
253</DD>
254</DL>
255<HR>
256
257<A NAME="checkOutputSpecs(org.apache.hadoop.fs.FileSystem, org.apache.hadoop.mapred.JobConf)"><!-- --></A><H3>
258checkOutputSpecs</H3>
259<PRE>
260public void <B>checkOutputSpecs</B>(<A HREF="../../../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;filesystem,
261                             <A HREF="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job)
262                      throws <A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE>
263<DL>
264<DD>Check for validity of the output-specification for the job.
265 
266 <p>This is to validate the output specification for the job when it is
267 a job is submitted.  Typically checks that it does not already exist,
268 throwing an exception when it already exists, so that output is not
269 overwritten.</p>
270<P>
271<DD><DL>
272<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../../org/apache/hadoop/mapred/OutputFormat.html#checkOutputSpecs(org.apache.hadoop.fs.FileSystem, org.apache.hadoop.mapred.JobConf)">checkOutputSpecs</A></CODE> in interface <CODE><A HREF="../../../../../../org/apache/hadoop/mapred/OutputFormat.html" title="interface in org.apache.hadoop.mapred">OutputFormat</A>&lt;<A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBOutputFormat.html" title="type parameter in DBOutputFormat">K</A> extends <A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBWritable.html" title="interface in org.apache.hadoop.mapred.lib.db">DBWritable</A>,<A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBOutputFormat.html" title="type parameter in DBOutputFormat">V</A>&gt;</CODE></DL>
273</DD>
274<DD><DL>
275<DD><CODE>job</CODE> - job configuration.
276<DT><B>Throws:</B>
277<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE> - when output should not be attempted</DL>
278</DD>
279</DL>
280<HR>
281
282<A NAME="getRecordWriter(org.apache.hadoop.fs.FileSystem, org.apache.hadoop.mapred.JobConf, java.lang.String, org.apache.hadoop.util.Progressable)"><!-- --></A><H3>
283getRecordWriter</H3>
284<PRE>
285public <A HREF="../../../../../../org/apache/hadoop/mapred/RecordWriter.html" title="interface in org.apache.hadoop.mapred">RecordWriter</A>&lt;<A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBOutputFormat.html" title="type parameter in DBOutputFormat">K</A>,<A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBOutputFormat.html" title="type parameter in DBOutputFormat">V</A>&gt; <B>getRecordWriter</B>(<A HREF="../../../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;filesystem,
286                                         <A HREF="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job,
287                                         <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;name,
288                                         <A HREF="../../../../../../org/apache/hadoop/util/Progressable.html" title="interface in org.apache.hadoop.util">Progressable</A>&nbsp;progress)
289                                                     throws <A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE>
290<DL>
291<DD>Get the <A HREF="../../../../../../org/apache/hadoop/mapred/RecordWriter.html" title="interface in org.apache.hadoop.mapred"><CODE>RecordWriter</CODE></A> for the given job.
292<P>
293<DD><DL>
294<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../../org/apache/hadoop/mapred/OutputFormat.html#getRecordWriter(org.apache.hadoop.fs.FileSystem, org.apache.hadoop.mapred.JobConf, java.lang.String, org.apache.hadoop.util.Progressable)">getRecordWriter</A></CODE> in interface <CODE><A HREF="../../../../../../org/apache/hadoop/mapred/OutputFormat.html" title="interface in org.apache.hadoop.mapred">OutputFormat</A>&lt;<A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBOutputFormat.html" title="type parameter in DBOutputFormat">K</A> extends <A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBWritable.html" title="interface in org.apache.hadoop.mapred.lib.db">DBWritable</A>,<A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBOutputFormat.html" title="type parameter in DBOutputFormat">V</A>&gt;</CODE></DL>
295</DD>
296<DD><DL>
297<DD><CODE>job</CODE> - configuration for the job whose output is being written.<DD><CODE>name</CODE> - the unique name for this part of the output.<DD><CODE>progress</CODE> - mechanism for reporting progress while writing to file.
298<DT><B>Returns:</B><DD>a <A HREF="../../../../../../org/apache/hadoop/mapred/RecordWriter.html" title="interface in org.apache.hadoop.mapred"><CODE>RecordWriter</CODE></A> to write the output for the job.
299<DT><B>Throws:</B>
300<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL>
301</DD>
302</DL>
303<HR>
304
305<A NAME="setOutput(org.apache.hadoop.mapred.JobConf, java.lang.String, java.lang.String...)"><!-- --></A><H3>
306setOutput</H3>
307<PRE>
308public static void <B>setOutput</B>(<A HREF="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job,
309                             <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;tableName,
310                             <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>...&nbsp;fieldNames)</PRE>
311<DL>
312<DD>Initializes the reduce-part of the job with the appropriate output settings
313<P>
314<DD><DL>
315</DL>
316</DD>
317<DD><DL>
318<DT><B>Parameters:</B><DD><CODE>job</CODE> - The job<DD><CODE>tableName</CODE> - The table to insert data into<DD><CODE>fieldNames</CODE> - The field names in the table. If unknown, supply the appropriate
319          number of nulls.</DL>
320</DD>
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