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<FONT color="green">001</FONT>    /**<a name="line.1"></a>
<FONT color="green">002</FONT>     * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a>
<FONT color="green">003</FONT>     * or more contributor license agreements.  See the NOTICE file<a name="line.3"></a>
<FONT color="green">004</FONT>     * distributed with this work for additional information<a name="line.4"></a>
<FONT color="green">005</FONT>     * regarding copyright ownership.  The ASF licenses this file<a name="line.5"></a>
<FONT color="green">006</FONT>     * to you under the Apache License, Version 2.0 (the<a name="line.6"></a>
<FONT color="green">007</FONT>     * "License"); you may not use this file except in compliance<a name="line.7"></a>
<FONT color="green">008</FONT>     * with the License.  You may obtain a copy of the License at<a name="line.8"></a>
<FONT color="green">009</FONT>     *<a name="line.9"></a>
<FONT color="green">010</FONT>     *     http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a>
<FONT color="green">011</FONT>     *<a name="line.11"></a>
<FONT color="green">012</FONT>     * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a>
<FONT color="green">013</FONT>     * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a>
<FONT color="green">014</FONT>     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a>
<FONT color="green">015</FONT>     * See the License for the specific language governing permissions and<a name="line.15"></a>
<FONT color="green">016</FONT>     * limitations under the License.<a name="line.16"></a>
<FONT color="green">017</FONT>     */<a name="line.17"></a>
<FONT color="green">018</FONT>    <a name="line.18"></a>
<FONT color="green">019</FONT>    package org.apache.hadoop.mapreduce.lib.db;<a name="line.19"></a>
<FONT color="green">020</FONT>    <a name="line.20"></a>
<FONT color="green">021</FONT>    import java.io.IOException;<a name="line.21"></a>
<FONT color="green">022</FONT>    import java.sql.Connection;<a name="line.22"></a>
<FONT color="green">023</FONT>    import java.sql.PreparedStatement;<a name="line.23"></a>
<FONT color="green">024</FONT>    import java.sql.SQLException;<a name="line.24"></a>
<FONT color="green">025</FONT>    <a name="line.25"></a>
<FONT color="green">026</FONT>    import org.apache.commons.logging.Log;<a name="line.26"></a>
<FONT color="green">027</FONT>    import org.apache.commons.logging.LogFactory;<a name="line.27"></a>
<FONT color="green">028</FONT>    import org.apache.hadoop.classification.InterfaceAudience;<a name="line.28"></a>
<FONT color="green">029</FONT>    import org.apache.hadoop.classification.InterfaceStability;<a name="line.29"></a>
<FONT color="green">030</FONT>    import org.apache.hadoop.mapreduce.Job;<a name="line.30"></a>
<FONT color="green">031</FONT>    import org.apache.hadoop.mapreduce.JobContext;<a name="line.31"></a>
<FONT color="green">032</FONT>    import org.apache.hadoop.mapreduce.OutputCommitter;<a name="line.32"></a>
<FONT color="green">033</FONT>    import org.apache.hadoop.mapreduce.OutputFormat;<a name="line.33"></a>
<FONT color="green">034</FONT>    import org.apache.hadoop.mapreduce.RecordWriter;<a name="line.34"></a>
<FONT color="green">035</FONT>    import org.apache.hadoop.mapreduce.TaskAttemptContext;<a name="line.35"></a>
<FONT color="green">036</FONT>    import org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter;<a name="line.36"></a>
<FONT color="green">037</FONT>    import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;<a name="line.37"></a>
<FONT color="green">038</FONT>    import org.apache.hadoop.util.StringUtils;<a name="line.38"></a>
<FONT color="green">039</FONT>    <a name="line.39"></a>
<FONT color="green">040</FONT>    /**<a name="line.40"></a>
<FONT color="green">041</FONT>     * A OutputFormat that sends the reduce output to a SQL table.<a name="line.41"></a>
<FONT color="green">042</FONT>     * &lt;p&gt; <a name="line.42"></a>
<FONT color="green">043</FONT>     * {@link DBOutputFormat} accepts &amp;lt;key,value&amp;gt; pairs, where <a name="line.43"></a>
<FONT color="green">044</FONT>     * key has a type extending DBWritable. Returned {@link RecordWriter} <a name="line.44"></a>
<FONT color="green">045</FONT>     * writes &lt;b&gt;only the key&lt;/b&gt; to the database with a batch SQL query.  <a name="line.45"></a>
<FONT color="green">046</FONT>     * <a name="line.46"></a>
<FONT color="green">047</FONT>     */<a name="line.47"></a>
<FONT color="green">048</FONT>    @InterfaceAudience.Public<a name="line.48"></a>
<FONT color="green">049</FONT>    @InterfaceStability.Stable<a name="line.49"></a>
<FONT color="green">050</FONT>    public class DBOutputFormat&lt;K  extends DBWritable, V&gt; <a name="line.50"></a>
<FONT color="green">051</FONT>    extends OutputFormat&lt;K,V&gt; {<a name="line.51"></a>
<FONT color="green">052</FONT>    <a name="line.52"></a>
<FONT color="green">053</FONT>      private static final Log LOG = LogFactory.getLog(DBOutputFormat.class);<a name="line.53"></a>
<FONT color="green">054</FONT>      public void checkOutputSpecs(JobContext context) <a name="line.54"></a>
<FONT color="green">055</FONT>          throws IOException, InterruptedException {}<a name="line.55"></a>
<FONT color="green">056</FONT>    <a name="line.56"></a>
<FONT color="green">057</FONT>      public OutputCommitter getOutputCommitter(TaskAttemptContext context) <a name="line.57"></a>
<FONT color="green">058</FONT>          throws IOException, InterruptedException {<a name="line.58"></a>
<FONT color="green">059</FONT>        return new FileOutputCommitter(FileOutputFormat.getOutputPath(context),<a name="line.59"></a>
<FONT color="green">060</FONT>                                       context);<a name="line.60"></a>
<FONT color="green">061</FONT>      }<a name="line.61"></a>
<FONT color="green">062</FONT>    <a name="line.62"></a>
<FONT color="green">063</FONT>      /**<a name="line.63"></a>
<FONT color="green">064</FONT>       * A RecordWriter that writes the reduce output to a SQL table<a name="line.64"></a>
<FONT color="green">065</FONT>       */<a name="line.65"></a>
<FONT color="green">066</FONT>      @InterfaceStability.Evolving<a name="line.66"></a>
<FONT color="green">067</FONT>      public class DBRecordWriter <a name="line.67"></a>
<FONT color="green">068</FONT>          extends RecordWriter&lt;K, V&gt; {<a name="line.68"></a>
<FONT color="green">069</FONT>    <a name="line.69"></a>
<FONT color="green">070</FONT>        private Connection connection;<a name="line.70"></a>
<FONT color="green">071</FONT>        private PreparedStatement statement;<a name="line.71"></a>
<FONT color="green">072</FONT>    <a name="line.72"></a>
<FONT color="green">073</FONT>        public DBRecordWriter() throws SQLException {<a name="line.73"></a>
<FONT color="green">074</FONT>        }<a name="line.74"></a>
<FONT color="green">075</FONT>    <a name="line.75"></a>
<FONT color="green">076</FONT>        public DBRecordWriter(Connection connection<a name="line.76"></a>
<FONT color="green">077</FONT>            , PreparedStatement statement) throws SQLException {<a name="line.77"></a>
<FONT color="green">078</FONT>          this.connection = connection;<a name="line.78"></a>
<FONT color="green">079</FONT>          this.statement = statement;<a name="line.79"></a>
<FONT color="green">080</FONT>          this.connection.setAutoCommit(false);<a name="line.80"></a>
<FONT color="green">081</FONT>        }<a name="line.81"></a>
<FONT color="green">082</FONT>    <a name="line.82"></a>
<FONT color="green">083</FONT>        public Connection getConnection() {<a name="line.83"></a>
<FONT color="green">084</FONT>          return connection;<a name="line.84"></a>
<FONT color="green">085</FONT>        }<a name="line.85"></a>
<FONT color="green">086</FONT>        <a name="line.86"></a>
<FONT color="green">087</FONT>        public PreparedStatement getStatement() {<a name="line.87"></a>
<FONT color="green">088</FONT>          return statement;<a name="line.88"></a>
<FONT color="green">089</FONT>        }<a name="line.89"></a>
<FONT color="green">090</FONT>        <a name="line.90"></a>
<FONT color="green">091</FONT>        /** {@inheritDoc} */<a name="line.91"></a>
<FONT color="green">092</FONT>        public void close(TaskAttemptContext context) throws IOException {<a name="line.92"></a>
<FONT color="green">093</FONT>          try {<a name="line.93"></a>
<FONT color="green">094</FONT>            statement.executeBatch();<a name="line.94"></a>
<FONT color="green">095</FONT>            connection.commit();<a name="line.95"></a>
<FONT color="green">096</FONT>          } catch (SQLException e) {<a name="line.96"></a>
<FONT color="green">097</FONT>            try {<a name="line.97"></a>
<FONT color="green">098</FONT>              connection.rollback();<a name="line.98"></a>
<FONT color="green">099</FONT>            }<a name="line.99"></a>
<FONT color="green">100</FONT>            catch (SQLException ex) {<a name="line.100"></a>
<FONT color="green">101</FONT>              LOG.warn(StringUtils.stringifyException(ex));<a name="line.101"></a>
<FONT color="green">102</FONT>            }<a name="line.102"></a>
<FONT color="green">103</FONT>            throw new IOException(e.getMessage());<a name="line.103"></a>
<FONT color="green">104</FONT>          } finally {<a name="line.104"></a>
<FONT color="green">105</FONT>            try {<a name="line.105"></a>
<FONT color="green">106</FONT>              statement.close();<a name="line.106"></a>
<FONT color="green">107</FONT>              connection.close();<a name="line.107"></a>
<FONT color="green">108</FONT>            }<a name="line.108"></a>
<FONT color="green">109</FONT>            catch (SQLException ex) {<a name="line.109"></a>
<FONT color="green">110</FONT>              throw new IOException(ex.getMessage());<a name="line.110"></a>
<FONT color="green">111</FONT>            }<a name="line.111"></a>
<FONT color="green">112</FONT>          }<a name="line.112"></a>
<FONT color="green">113</FONT>        }<a name="line.113"></a>
<FONT color="green">114</FONT>    <a name="line.114"></a>
<FONT color="green">115</FONT>        /** {@inheritDoc} */<a name="line.115"></a>
<FONT color="green">116</FONT>        public void write(K key, V value) throws IOException {<a name="line.116"></a>
<FONT color="green">117</FONT>          try {<a name="line.117"></a>
<FONT color="green">118</FONT>            key.write(statement);<a name="line.118"></a>
<FONT color="green">119</FONT>            statement.addBatch();<a name="line.119"></a>
<FONT color="green">120</FONT>          } catch (SQLException e) {<a name="line.120"></a>
<FONT color="green">121</FONT>            e.printStackTrace();<a name="line.121"></a>
<FONT color="green">122</FONT>          }<a name="line.122"></a>
<FONT color="green">123</FONT>        }<a name="line.123"></a>
<FONT color="green">124</FONT>      }<a name="line.124"></a>
<FONT color="green">125</FONT>    <a name="line.125"></a>
<FONT color="green">126</FONT>      /**<a name="line.126"></a>
<FONT color="green">127</FONT>       * Constructs the query used as the prepared statement to insert data.<a name="line.127"></a>
<FONT color="green">128</FONT>       * <a name="line.128"></a>
<FONT color="green">129</FONT>       * @param table<a name="line.129"></a>
<FONT color="green">130</FONT>       *          the table to insert into<a name="line.130"></a>
<FONT color="green">131</FONT>       * @param fieldNames<a name="line.131"></a>
<FONT color="green">132</FONT>       *          the fields to insert into. If field names are unknown, supply an<a name="line.132"></a>
<FONT color="green">133</FONT>       *          array of nulls.<a name="line.133"></a>
<FONT color="green">134</FONT>       */<a name="line.134"></a>
<FONT color="green">135</FONT>      public String constructQuery(String table, String[] fieldNames) {<a name="line.135"></a>
<FONT color="green">136</FONT>        if(fieldNames == null) {<a name="line.136"></a>
<FONT color="green">137</FONT>          throw new IllegalArgumentException("Field names may not be null");<a name="line.137"></a>
<FONT color="green">138</FONT>        }<a name="line.138"></a>
<FONT color="green">139</FONT>    <a name="line.139"></a>
<FONT color="green">140</FONT>        StringBuilder query = new StringBuilder();<a name="line.140"></a>
<FONT color="green">141</FONT>        query.append("INSERT INTO ").append(table);<a name="line.141"></a>
<FONT color="green">142</FONT>    <a name="line.142"></a>
<FONT color="green">143</FONT>        if (fieldNames.length &gt; 0 &amp;&amp; fieldNames[0] != null) {<a name="line.143"></a>
<FONT color="green">144</FONT>          query.append(" (");<a name="line.144"></a>
<FONT color="green">145</FONT>          for (int i = 0; i &lt; fieldNames.length; i++) {<a name="line.145"></a>
<FONT color="green">146</FONT>            query.append(fieldNames[i]);<a name="line.146"></a>
<FONT color="green">147</FONT>            if (i != fieldNames.length - 1) {<a name="line.147"></a>
<FONT color="green">148</FONT>              query.append(",");<a name="line.148"></a>
<FONT color="green">149</FONT>            }<a name="line.149"></a>
<FONT color="green">150</FONT>          }<a name="line.150"></a>
<FONT color="green">151</FONT>          query.append(")");<a name="line.151"></a>
<FONT color="green">152</FONT>        }<a name="line.152"></a>
<FONT color="green">153</FONT>        query.append(" VALUES (");<a name="line.153"></a>
<FONT color="green">154</FONT>    <a name="line.154"></a>
<FONT color="green">155</FONT>        for (int i = 0; i &lt; fieldNames.length; i++) {<a name="line.155"></a>
<FONT color="green">156</FONT>          query.append("?");<a name="line.156"></a>
<FONT color="green">157</FONT>          if(i != fieldNames.length - 1) {<a name="line.157"></a>
<FONT color="green">158</FONT>            query.append(",");<a name="line.158"></a>
<FONT color="green">159</FONT>          }<a name="line.159"></a>
<FONT color="green">160</FONT>        }<a name="line.160"></a>
<FONT color="green">161</FONT>        query.append(");");<a name="line.161"></a>
<FONT color="green">162</FONT>    <a name="line.162"></a>
<FONT color="green">163</FONT>        return query.toString();<a name="line.163"></a>
<FONT color="green">164</FONT>      }<a name="line.164"></a>
<FONT color="green">165</FONT>    <a name="line.165"></a>
<FONT color="green">166</FONT>      /** {@inheritDoc} */<a name="line.166"></a>
<FONT color="green">167</FONT>      public RecordWriter&lt;K, V&gt; getRecordWriter(TaskAttemptContext context) <a name="line.167"></a>
<FONT color="green">168</FONT>          throws IOException {<a name="line.168"></a>
<FONT color="green">169</FONT>        DBConfiguration dbConf = new DBConfiguration(context.getConfiguration());<a name="line.169"></a>
<FONT color="green">170</FONT>        String tableName = dbConf.getOutputTableName();<a name="line.170"></a>
<FONT color="green">171</FONT>        String[] fieldNames = dbConf.getOutputFieldNames();<a name="line.171"></a>
<FONT color="green">172</FONT>        <a name="line.172"></a>
<FONT color="green">173</FONT>        if(fieldNames == null) {<a name="line.173"></a>
<FONT color="green">174</FONT>          fieldNames = new String[dbConf.getOutputFieldCount()];<a name="line.174"></a>
<FONT color="green">175</FONT>        }<a name="line.175"></a>
<FONT color="green">176</FONT>        <a name="line.176"></a>
<FONT color="green">177</FONT>        try {<a name="line.177"></a>
<FONT color="green">178</FONT>          Connection connection = dbConf.getConnection();<a name="line.178"></a>
<FONT color="green">179</FONT>          PreparedStatement statement = null;<a name="line.179"></a>
<FONT color="green">180</FONT>      <a name="line.180"></a>
<FONT color="green">181</FONT>          statement = connection.prepareStatement(<a name="line.181"></a>
<FONT color="green">182</FONT>                        constructQuery(tableName, fieldNames));<a name="line.182"></a>
<FONT color="green">183</FONT>          return new DBRecordWriter(connection, statement);<a name="line.183"></a>
<FONT color="green">184</FONT>        } catch (Exception ex) {<a name="line.184"></a>
<FONT color="green">185</FONT>          throw new IOException(ex.getMessage());<a name="line.185"></a>
<FONT color="green">186</FONT>        }<a name="line.186"></a>
<FONT color="green">187</FONT>      }<a name="line.187"></a>
<FONT color="green">188</FONT>    <a name="line.188"></a>
<FONT color="green">189</FONT>      /**<a name="line.189"></a>
<FONT color="green">190</FONT>       * Initializes the reduce-part of the job with <a name="line.190"></a>
<FONT color="green">191</FONT>       * the appropriate output settings<a name="line.191"></a>
<FONT color="green">192</FONT>       * <a name="line.192"></a>
<FONT color="green">193</FONT>       * @param job The job<a name="line.193"></a>
<FONT color="green">194</FONT>       * @param tableName The table to insert data into<a name="line.194"></a>
<FONT color="green">195</FONT>       * @param fieldNames The field names in the table.<a name="line.195"></a>
<FONT color="green">196</FONT>       */<a name="line.196"></a>
<FONT color="green">197</FONT>      public static void setOutput(Job job, String tableName, <a name="line.197"></a>
<FONT color="green">198</FONT>          String... fieldNames) throws IOException {<a name="line.198"></a>
<FONT color="green">199</FONT>        if(fieldNames.length &gt; 0 &amp;&amp; fieldNames[0] != null) {<a name="line.199"></a>
<FONT color="green">200</FONT>          DBConfiguration dbConf = setOutput(job, tableName);<a name="line.200"></a>
<FONT color="green">201</FONT>          dbConf.setOutputFieldNames(fieldNames);<a name="line.201"></a>
<FONT color="green">202</FONT>        } else {<a name="line.202"></a>
<FONT color="green">203</FONT>          if (fieldNames.length &gt; 0) {<a name="line.203"></a>
<FONT color="green">204</FONT>            setOutput(job, tableName, fieldNames.length);<a name="line.204"></a>
<FONT color="green">205</FONT>          }<a name="line.205"></a>
<FONT color="green">206</FONT>          else { <a name="line.206"></a>
<FONT color="green">207</FONT>            throw new IllegalArgumentException(<a name="line.207"></a>
<FONT color="green">208</FONT>              "Field names must be greater than 0");<a name="line.208"></a>
<FONT color="green">209</FONT>          }<a name="line.209"></a>
<FONT color="green">210</FONT>        }<a name="line.210"></a>
<FONT color="green">211</FONT>      }<a name="line.211"></a>
<FONT color="green">212</FONT>      <a name="line.212"></a>
<FONT color="green">213</FONT>      /**<a name="line.213"></a>
<FONT color="green">214</FONT>       * Initializes the reduce-part of the job <a name="line.214"></a>
<FONT color="green">215</FONT>       * with the appropriate output settings<a name="line.215"></a>
<FONT color="green">216</FONT>       * <a name="line.216"></a>
<FONT color="green">217</FONT>       * @param job The job<a name="line.217"></a>
<FONT color="green">218</FONT>       * @param tableName The table to insert data into<a name="line.218"></a>
<FONT color="green">219</FONT>       * @param fieldCount the number of fields in the table.<a name="line.219"></a>
<FONT color="green">220</FONT>       */<a name="line.220"></a>
<FONT color="green">221</FONT>      public static void setOutput(Job job, String tableName, <a name="line.221"></a>
<FONT color="green">222</FONT>          int fieldCount) throws IOException {<a name="line.222"></a>
<FONT color="green">223</FONT>        DBConfiguration dbConf = setOutput(job, tableName);<a name="line.223"></a>
<FONT color="green">224</FONT>        dbConf.setOutputFieldCount(fieldCount);<a name="line.224"></a>
<FONT color="green">225</FONT>      }<a name="line.225"></a>
<FONT color="green">226</FONT>      <a name="line.226"></a>
<FONT color="green">227</FONT>      private static DBConfiguration setOutput(Job job,<a name="line.227"></a>
<FONT color="green">228</FONT>          String tableName) throws IOException {<a name="line.228"></a>
<FONT color="green">229</FONT>        job.setOutputFormatClass(DBOutputFormat.class);<a name="line.229"></a>
<FONT color="green">230</FONT>        job.setReduceSpeculativeExecution(false);<a name="line.230"></a>
<FONT color="green">231</FONT>    <a name="line.231"></a>
<FONT color="green">232</FONT>        DBConfiguration dbConf = new DBConfiguration(job.getConfiguration());<a name="line.232"></a>
<FONT color="green">233</FONT>        <a name="line.233"></a>
<FONT color="green">234</FONT>        dbConf.setOutputTableName(tableName);<a name="line.234"></a>
<FONT color="green">235</FONT>        return dbConf;<a name="line.235"></a>
<FONT color="green">236</FONT>      }<a name="line.236"></a>
<FONT color="green">237</FONT>    }<a name="line.237"></a>




























































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