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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.SQLException;<a name="line.23"></a>
<FONT color="green">024</FONT>    import java.lang.reflect.Method;<a name="line.24"></a>
<FONT color="green">025</FONT>    <a name="line.25"></a>
<FONT color="green">026</FONT>    import org.apache.hadoop.classification.InterfaceAudience;<a name="line.26"></a>
<FONT color="green">027</FONT>    import org.apache.hadoop.classification.InterfaceStability;<a name="line.27"></a>
<FONT color="green">028</FONT>    import org.apache.hadoop.conf.Configuration;<a name="line.28"></a>
<FONT color="green">029</FONT>    import org.apache.commons.logging.Log;<a name="line.29"></a>
<FONT color="green">030</FONT>    import org.apache.commons.logging.LogFactory;<a name="line.30"></a>
<FONT color="green">031</FONT>    <a name="line.31"></a>
<FONT color="green">032</FONT>    /**<a name="line.32"></a>
<FONT color="green">033</FONT>     * A RecordReader that reads records from an Oracle SQL table.<a name="line.33"></a>
<FONT color="green">034</FONT>     */<a name="line.34"></a>
<FONT color="green">035</FONT>    @InterfaceAudience.Public<a name="line.35"></a>
<FONT color="green">036</FONT>    @InterfaceStability.Evolving<a name="line.36"></a>
<FONT color="green">037</FONT>    public class OracleDBRecordReader&lt;T extends DBWritable&gt; extends DBRecordReader&lt;T&gt; {<a name="line.37"></a>
<FONT color="green">038</FONT>    <a name="line.38"></a>
<FONT color="green">039</FONT>      /** Configuration key to set to a timezone string. */<a name="line.39"></a>
<FONT color="green">040</FONT>      public static final String SESSION_TIMEZONE_KEY = "oracle.sessionTimeZone";<a name="line.40"></a>
<FONT color="green">041</FONT>    <a name="line.41"></a>
<FONT color="green">042</FONT>      private static final Log LOG = LogFactory.getLog(OracleDBRecordReader.class);<a name="line.42"></a>
<FONT color="green">043</FONT>    <a name="line.43"></a>
<FONT color="green">044</FONT>      public OracleDBRecordReader(DBInputFormat.DBInputSplit split, <a name="line.44"></a>
<FONT color="green">045</FONT>          Class&lt;T&gt; inputClass, Configuration conf, Connection conn, DBConfiguration dbConfig,<a name="line.45"></a>
<FONT color="green">046</FONT>          String cond, String [] fields, String table) throws SQLException {<a name="line.46"></a>
<FONT color="green">047</FONT>        super(split, inputClass, conf, conn, dbConfig, cond, fields, table);<a name="line.47"></a>
<FONT color="green">048</FONT>        setSessionTimeZone(conf, conn);<a name="line.48"></a>
<FONT color="green">049</FONT>      }<a name="line.49"></a>
<FONT color="green">050</FONT>    <a name="line.50"></a>
<FONT color="green">051</FONT>      /** Returns the query for selecting the records from an Oracle DB. */<a name="line.51"></a>
<FONT color="green">052</FONT>      protected String getSelectQuery() {<a name="line.52"></a>
<FONT color="green">053</FONT>        StringBuilder query = new StringBuilder();<a name="line.53"></a>
<FONT color="green">054</FONT>        DBConfiguration dbConf = getDBConf();<a name="line.54"></a>
<FONT color="green">055</FONT>        String conditions = getConditions();<a name="line.55"></a>
<FONT color="green">056</FONT>        String tableName = getTableName();<a name="line.56"></a>
<FONT color="green">057</FONT>        String [] fieldNames = getFieldNames();<a name="line.57"></a>
<FONT color="green">058</FONT>    <a name="line.58"></a>
<FONT color="green">059</FONT>        // Oracle-specific codepath to use rownum instead of LIMIT/OFFSET.<a name="line.59"></a>
<FONT color="green">060</FONT>        if(dbConf.getInputQuery() == null) {<a name="line.60"></a>
<FONT color="green">061</FONT>          query.append("SELECT ");<a name="line.61"></a>
<FONT color="green">062</FONT>      <a name="line.62"></a>
<FONT color="green">063</FONT>          for (int i = 0; i &lt; fieldNames.length; i++) {<a name="line.63"></a>
<FONT color="green">064</FONT>            query.append(fieldNames[i]);<a name="line.64"></a>
<FONT color="green">065</FONT>            if (i != fieldNames.length -1) {<a name="line.65"></a>
<FONT color="green">066</FONT>              query.append(", ");<a name="line.66"></a>
<FONT color="green">067</FONT>            }<a name="line.67"></a>
<FONT color="green">068</FONT>          }<a name="line.68"></a>
<FONT color="green">069</FONT>      <a name="line.69"></a>
<FONT color="green">070</FONT>          query.append(" FROM ").append(tableName);<a name="line.70"></a>
<FONT color="green">071</FONT>          if (conditions != null &amp;&amp; conditions.length() &gt; 0)<a name="line.71"></a>
<FONT color="green">072</FONT>            query.append(" WHERE ").append(conditions);<a name="line.72"></a>
<FONT color="green">073</FONT>          String orderBy = dbConf.getInputOrderBy();<a name="line.73"></a>
<FONT color="green">074</FONT>          if (orderBy != null &amp;&amp; orderBy.length() &gt; 0) {<a name="line.74"></a>
<FONT color="green">075</FONT>            query.append(" ORDER BY ").append(orderBy);<a name="line.75"></a>
<FONT color="green">076</FONT>          }<a name="line.76"></a>
<FONT color="green">077</FONT>        } else {<a name="line.77"></a>
<FONT color="green">078</FONT>          //PREBUILT QUERY<a name="line.78"></a>
<FONT color="green">079</FONT>          query.append(dbConf.getInputQuery());<a name="line.79"></a>
<FONT color="green">080</FONT>        }<a name="line.80"></a>
<FONT color="green">081</FONT>            <a name="line.81"></a>
<FONT color="green">082</FONT>        try {<a name="line.82"></a>
<FONT color="green">083</FONT>          DBInputFormat.DBInputSplit split = getSplit();<a name="line.83"></a>
<FONT color="green">084</FONT>          if (split.getLength() &gt; 0 &amp;&amp; split.getStart() &gt; 0){<a name="line.84"></a>
<FONT color="green">085</FONT>            String querystring = query.toString();<a name="line.85"></a>
<FONT color="green">086</FONT>    <a name="line.86"></a>
<FONT color="green">087</FONT>            query = new StringBuilder();<a name="line.87"></a>
<FONT color="green">088</FONT>            query.append("SELECT * FROM (SELECT a.*,ROWNUM dbif_rno FROM ( ");<a name="line.88"></a>
<FONT color="green">089</FONT>            query.append(querystring);<a name="line.89"></a>
<FONT color="green">090</FONT>            query.append(" ) a WHERE rownum &lt;= ").append(split.getStart());<a name="line.90"></a>
<FONT color="green">091</FONT>            query.append(" + ").append(split.getLength());<a name="line.91"></a>
<FONT color="green">092</FONT>            query.append(" ) WHERE dbif_rno &gt;= ").append(split.getStart());<a name="line.92"></a>
<FONT color="green">093</FONT>          }<a name="line.93"></a>
<FONT color="green">094</FONT>        } catch (IOException ex) {<a name="line.94"></a>
<FONT color="green">095</FONT>          // ignore, will not throw.<a name="line.95"></a>
<FONT color="green">096</FONT>        }                 <a name="line.96"></a>
<FONT color="green">097</FONT>    <a name="line.97"></a>
<FONT color="green">098</FONT>        return query.toString();<a name="line.98"></a>
<FONT color="green">099</FONT>      }<a name="line.99"></a>
<FONT color="green">100</FONT>    <a name="line.100"></a>
<FONT color="green">101</FONT>      /**<a name="line.101"></a>
<FONT color="green">102</FONT>       * Set session time zone<a name="line.102"></a>
<FONT color="green">103</FONT>       * @param conf The current configuration.<a name="line.103"></a>
<FONT color="green">104</FONT>       * We read the 'oracle.sessionTimeZone' property from here.<a name="line.104"></a>
<FONT color="green">105</FONT>       * @param conn The connection to alter the timezone properties of.<a name="line.105"></a>
<FONT color="green">106</FONT>       */<a name="line.106"></a>
<FONT color="green">107</FONT>      public static void setSessionTimeZone(Configuration conf,<a name="line.107"></a>
<FONT color="green">108</FONT>          Connection conn) throws SQLException {<a name="line.108"></a>
<FONT color="green">109</FONT>        // need to use reflection to call the method setSessionTimeZone on<a name="line.109"></a>
<FONT color="green">110</FONT>        // the OracleConnection class because oracle specific java libraries are<a name="line.110"></a>
<FONT color="green">111</FONT>        // not accessible in this context.<a name="line.111"></a>
<FONT color="green">112</FONT>        Method method;<a name="line.112"></a>
<FONT color="green">113</FONT>        try {<a name="line.113"></a>
<FONT color="green">114</FONT>          method = conn.getClass().getMethod(<a name="line.114"></a>
<FONT color="green">115</FONT>                  "setSessionTimeZone", new Class [] {String.class});<a name="line.115"></a>
<FONT color="green">116</FONT>        } catch (Exception ex) {<a name="line.116"></a>
<FONT color="green">117</FONT>          LOG.error("Could not find method setSessionTimeZone in " + conn.getClass().getName(), ex);<a name="line.117"></a>
<FONT color="green">118</FONT>          // rethrow SQLException<a name="line.118"></a>
<FONT color="green">119</FONT>          throw new SQLException(ex);<a name="line.119"></a>
<FONT color="green">120</FONT>        }<a name="line.120"></a>
<FONT color="green">121</FONT>    <a name="line.121"></a>
<FONT color="green">122</FONT>        // Need to set the time zone in order for Java<a name="line.122"></a>
<FONT color="green">123</FONT>        // to correctly access the column "TIMESTAMP WITH LOCAL TIME ZONE".<a name="line.123"></a>
<FONT color="green">124</FONT>        // We can't easily get the correct Oracle-specific timezone string<a name="line.124"></a>
<FONT color="green">125</FONT>        // from Java; just let the user set the timezone in a property.<a name="line.125"></a>
<FONT color="green">126</FONT>        String clientTimeZone = conf.get(SESSION_TIMEZONE_KEY, "GMT");<a name="line.126"></a>
<FONT color="green">127</FONT>        try {<a name="line.127"></a>
<FONT color="green">128</FONT>          method.setAccessible(true);<a name="line.128"></a>
<FONT color="green">129</FONT>          method.invoke(conn, clientTimeZone);<a name="line.129"></a>
<FONT color="green">130</FONT>          LOG.info("Time zone has been set to " + clientTimeZone);<a name="line.130"></a>
<FONT color="green">131</FONT>        } catch (Exception ex) {<a name="line.131"></a>
<FONT color="green">132</FONT>          LOG.warn("Time zone " + clientTimeZone +<a name="line.132"></a>
<FONT color="green">133</FONT>                   " could not be set on Oracle database.");<a name="line.133"></a>
<FONT color="green">134</FONT>          LOG.warn("Setting default time zone: GMT");<a name="line.134"></a>
<FONT color="green">135</FONT>          try {<a name="line.135"></a>
<FONT color="green">136</FONT>            // "GMT" timezone is guaranteed to exist.<a name="line.136"></a>
<FONT color="green">137</FONT>            method.invoke(conn, "GMT");<a name="line.137"></a>
<FONT color="green">138</FONT>          } catch (Exception ex2) {<a name="line.138"></a>
<FONT color="green">139</FONT>            LOG.error("Could not set time zone for oracle connection", ex2);<a name="line.139"></a>
<FONT color="green">140</FONT>            // rethrow SQLException<a name="line.140"></a>
<FONT color="green">141</FONT>            throw new SQLException(ex);<a name="line.141"></a>
<FONT color="green">142</FONT>          }<a name="line.142"></a>
<FONT color="green">143</FONT>        }<a name="line.143"></a>
<FONT color="green">144</FONT>      }<a name="line.144"></a>
<FONT color="green">145</FONT>    }<a name="line.145"></a>




























































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