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| <div class="subTitle">org.apache.hadoop.mapreduce.lib.db</div> |
| <h2 title="Interface DBWritable" class="title">Interface DBWritable</h2> |
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| <dt>All Known Subinterfaces:</dt> |
| <dd><a href="../../../../../../org/apache/hadoop/mapred/lib/db/DBWritable.html" title="interface in org.apache.hadoop.mapred.lib.db">DBWritable</a></dd> |
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| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public interface <span class="typeNameLabel">DBWritable</span></pre> |
| <div class="block">Objects that are read from/written to a database should implement |
| <code>DBWritable</code>. DBWritable, is similar to <a href="../../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io"><code>Writable</code></a> |
| except that the <a href="../../../../../../org/apache/hadoop/mapreduce/lib/db/DBWritable.html#write-java.sql.PreparedStatement-"><code>write(PreparedStatement)</code></a> method takes a |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/sql/PreparedStatement.html?is-external=true" title="class or interface in java.sql"><code>PreparedStatement</code></a>, and <a href="../../../../../../org/apache/hadoop/mapreduce/lib/db/DBWritable.html#readFields-java.sql.ResultSet-"><code>readFields(ResultSet)</code></a> |
| takes a <a href="https://docs.oracle.com/javase/8/docs/api/java/sql/ResultSet.html?is-external=true" title="class or interface in java.sql"><code>ResultSet</code></a>. |
| <p> |
| Implementations are responsible for writing the fields of the object |
| to PreparedStatement, and reading the fields of the object from the |
| ResultSet. |
| |
| <p>Example:</p> |
| If we have the following table in the database : |
| <pre> |
| CREATE TABLE MyTable ( |
| counter INTEGER NOT NULL, |
| timestamp BIGINT NOT NULL, |
| ); |
| </pre> |
| then we can read/write the tuples from/to the table with : |
| <p><pre> |
| public class MyWritable implements Writable, DBWritable { |
| // Some data |
| private int counter; |
| private long timestamp; |
| |
| //Writable#write() implementation |
| public void write(DataOutput out) throws IOException { |
| out.writeInt(counter); |
| out.writeLong(timestamp); |
| } |
| |
| //Writable#readFields() implementation |
| public void readFields(DataInput in) throws IOException { |
| counter = in.readInt(); |
| timestamp = in.readLong(); |
| } |
| |
| public void write(PreparedStatement statement) throws SQLException { |
| statement.setInt(1, counter); |
| statement.setLong(2, timestamp); |
| } |
| |
| public void readFields(ResultSet resultSet) throws SQLException { |
| counter = resultSet.getInt(1); |
| timestamp = resultSet.getLong(2); |
| } |
| } |
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| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/db/DBWritable.html#readFields-java.sql.ResultSet-">readFields</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/sql/ResultSet.html?is-external=true" title="class or interface in java.sql">ResultSet</a> resultSet)</code> |
| <div class="block">Reads the fields of the object from the <a href="https://docs.oracle.com/javase/8/docs/api/java/sql/ResultSet.html?is-external=true" title="class or interface in java.sql"><code>ResultSet</code></a>.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/db/DBWritable.html#write-java.sql.PreparedStatement-">write</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/sql/PreparedStatement.html?is-external=true" title="class or interface in java.sql">PreparedStatement</a> statement)</code> |
| <div class="block">Sets the fields of the object in the <a href="https://docs.oracle.com/javase/8/docs/api/java/sql/PreparedStatement.html?is-external=true" title="class or interface in java.sql"><code>PreparedStatement</code></a>.</div> |
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| <h4>write</h4> |
| <pre>void write(<a href="https://docs.oracle.com/javase/8/docs/api/java/sql/PreparedStatement.html?is-external=true" title="class or interface in java.sql">PreparedStatement</a> statement) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/sql/SQLException.html?is-external=true" title="class or interface in java.sql">SQLException</a></pre> |
| <div class="block">Sets the fields of the object in the <a href="https://docs.oracle.com/javase/8/docs/api/java/sql/PreparedStatement.html?is-external=true" title="class or interface in java.sql"><code>PreparedStatement</code></a>.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>statement</code> - the statement that the fields are put into.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/sql/SQLException.html?is-external=true" title="class or interface in java.sql">SQLException</a></code></dd> |
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| <h4>readFields</h4> |
| <pre>void readFields(<a href="https://docs.oracle.com/javase/8/docs/api/java/sql/ResultSet.html?is-external=true" title="class or interface in java.sql">ResultSet</a> resultSet) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/sql/SQLException.html?is-external=true" title="class or interface in java.sql">SQLException</a></pre> |
| <div class="block">Reads the fields of the object from the <a href="https://docs.oracle.com/javase/8/docs/api/java/sql/ResultSet.html?is-external=true" title="class or interface in java.sql"><code>ResultSet</code></a>.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>resultSet</code> - the <a href="https://docs.oracle.com/javase/8/docs/api/java/sql/ResultSet.html?is-external=true" title="class or interface in java.sql"><code>ResultSet</code></a> to get the fields from.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/sql/SQLException.html?is-external=true" title="class or interface in java.sql">SQLException</a></code></dd> |
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