protected RecordReader<LongWritable, T> createDBRecordReader(
DBInputSplit split, Configuration conf) throws IOException {
@SuppressWarnings("unchecked")
Class<T> inputClass = (Class<T>) (dbConf.getInputClass());
try {
// use database product name to determine appropriate record reader.
if (dbProductName.startsWith("ORACLE")) {
// use Oracle-specific db reader.
return new OracleDBRecordReader<T>(
split, inputClass, conf, connection, getDBConf(), conditions, fieldNames, tableName);
} else if (dbProductName.startsWith("MYSQL")) {
// use MySQL-specific db reader.
return new MySQLDBRecordReader<T>(
split, inputClass, conf, connection, getDBConf(), conditions, fieldNames, tableName);
} else {
// Generic reader.
return new DBRecordReader<T>(
split, inputClass, conf, connection, getDBConf(), conditions, fieldNames, tableName);
}
} catch (SQLException ex) {
throw new IOException(ex.getMessage());
}
}
