Java DBInputSplit類代碼示例

import com.cloudera.sqoop.mapreduce.db.DBInputFormat.DBInputSplit; //導入依賴的package包/類
public static OraOopDBInputSplit castSplit(DBInputSplit split) {

    // Check there's a split available...
    if (split == null) {
      throw new IllegalArgumentException("The DBInputSplit cannot be null.");
    }

    // Check that the split is the correct type...
    Class<?> desiredSplitClass = OraOopDBInputSplit.class;
    if (!(split.getClass() == desiredSplitClass)) {
      String errMsg =
          String.format("The type of Split available within %s "
              + "should be an instance of class %s, "
              + "but is actually an instance of class %s", OraOopUtilities
              .getCurrentMethodName(), desiredSplitClass.getName(), split
              .getClass().getName());
      throw new RuntimeException(errMsg);
    }

    // TODO Cast this using desiredSplitClass, so we only need 1 line of code
    // that
    // identifies the type of the split class...
    // inputSplit = (desiredSplitClass)this.getSplit();
    return (OraOopDBInputSplit) split;
  }
 

import com.cloudera.sqoop.mapreduce.db.DBInputFormat.DBInputSplit; //導入依賴的package包/類
@Override
protected RecordReader<LongWritable, T> createDBRecordReader(
    DBInputSplit split, Configuration conf) throws IOException {

  DBConfiguration dbConf = getDBConf();
  @SuppressWarnings("unchecked")
  Class<T> inputClass = (Class<T>) (dbConf.getInputClass());

  try {
    // Use Oracle-specific db reader
    return new OracleDataDrivenDBRecordReader<T>(split, inputClass,
        conf, getConnection(), dbConf, dbConf.getInputConditions(),
        dbConf.getInputFieldNames(), dbConf.getInputTableName());
  } catch (SQLException ex) {
    throw new IOException(ex);
  }
}
 

import com.cloudera.sqoop.mapreduce.db.DBInputFormat.DBInputSplit; //導入依賴的package包/類
protected RecordReader<LongWritable, T> createDBRecordReader(
    DBInputSplit split, Configuration conf) throws IOException {

  DBConfiguration dbConf = getDBConf();
  @SuppressWarnings("unchecked")
  Class<T> inputClass = (Class<T>) (dbConf.getInputClass());
  String dbProductName = getDBProductName();

  LOG.debug("Creating db record reader for db product: " + dbProductName);

  try {
    return new DataDrivenDBRecordReader<T>(split, inputClass,
        conf, getConnection(), dbConf, dbConf.getInputConditions(),
        dbConf.getInputFieldNames(), dbConf.getInputTableName(),
        dbProductName);
  } catch (SQLException ex) {
    throw new IOException(ex);
  }
}
 

import com.cloudera.sqoop.mapreduce.db.DBInputFormat.DBInputSplit; //導入依賴的package包/類
public OraOopDBRecordReader(DBInputFormat.DBInputSplit split,
    Class<T> inputClass, Configuration conf, Connection conn,
    DBConfiguration dbConfig, String cond, String[] fields, String table)
    throws SQLException {

  super(split, inputClass, conf, conn, dbConfig, cond, fields, table,
      "ORACLE-ORAOOP");

  OraOopUtilities.enableDebugLoggingIfRequired(conf);

  this.dbInputSplit = castSplit(split);

  String thisOracleInstanceName =
      OraOopOracleQueries.getCurrentOracleInstanceName(conn);
  LOG.info(String.format(
      "This record reader is connected to Oracle via the JDBC URL: \n"
          + "\t\"%s\"\n" + "\tto the Oracle instance: \"%s\"", conn
          .toString(), thisOracleInstanceName));

  OracleConnectionFactory.initializeOracleConnection(conn, conf);

  if (OraOopUtilities.userWantsOracleSessionStatisticsReports(conf)) {
    this.oraOopOraStats = OraOopUtilities.startSessionSnapshot(conn);
  }

  this.numberOfBlocksInThisSplit =
      this.dbInputSplit.getTotalNumberOfBlocksInThisSplit();
  this.numberOfBlocksProcessedInThisSplit = 0;

  this.profilingEnabled = conf.getBoolean("oraoop.profiling.enabled", false);
}