org.apache.hive.storage.jdbc.dao

Interface DatabaseAccessor

All Known Implementing Classes:

DB2DatabaseAccessor, DerbyDatabaseAccessor, GenericJdbcDatabaseAccessor, HiveDatabaseAccessor, JethroDatabaseAccessor, MsSqlDatabaseAccessor, MySqlDatabaseAccessor, OracleDatabaseAccessor, PostgresDatabaseAccessor

public interface DatabaseAccessor

Method Summary

Modifier and Type	Method and Description
org.apache.commons.lang3.tuple.Pair<String,String>	getBounds(org.apache.hadoop.conf.Configuration conf, String partitionColumn, boolean lower, boolean upper)
List<String>	getColumnNames(org.apache.hadoop.conf.Configuration conf)
List<TypeInfo>	getColumnTypes(org.apache.hadoop.conf.Configuration conf) Returns a list of types for the columns in the specified configuration.
JdbcRecordIterator	getRecordIterator(org.apache.hadoop.conf.Configuration conf, String partitionColumn, String lowerBound, String upperBound, int limit, int offset)
org.apache.hadoop.mapreduce.RecordWriter	getRecordWriter(org.apache.hadoop.mapreduce.TaskAttemptContext context)
int	getTotalNumberOfRecords(org.apache.hadoop.conf.Configuration conf)
boolean	needColumnQuote()

Method Detail

getColumnNames

List<String> getColumnNames(org.apache.hadoop.conf.Configuration conf)
                     throws HiveJdbcDatabaseAccessException

Throws:

HiveJdbcDatabaseAccessException

getColumnTypes

List<TypeInfo> getColumnTypes(org.apache.hadoop.conf.Configuration conf)
                       throws HiveJdbcDatabaseAccessException

Returns a list of types for the columns in the specified configuration. The type must represent as close as possible the respective type of the column stored in the database. Since it does not exist an exact mapping between database types and Hive types the result is approximate. When it is not possible to derive a type for a given column the TypeInfoFactory.unknownTypeInfo is used. There is a one-to-one correspondence between the types returned in this method and the column names obtained with getColumnNames(Configuration). Implementors of the method can derive the types by querying the database, exploit the state of the accessor, or use the configuration.

Throws:

HiveJdbcDatabaseAccessException - if some error occurs while accessing the database

getTotalNumberOfRecords

int getTotalNumberOfRecords(org.apache.hadoop.conf.Configuration conf)
                     throws HiveJdbcDatabaseAccessException

Throws:

HiveJdbcDatabaseAccessException

getRecordIterator

JdbcRecordIterator getRecordIterator(org.apache.hadoop.conf.Configuration conf,
                                     String partitionColumn,
                                     String lowerBound,
                                     String upperBound,
                                     int limit,
                                     int offset)
                              throws HiveJdbcDatabaseAccessException

Throws:

HiveJdbcDatabaseAccessException

getRecordWriter

org.apache.hadoop.mapreduce.RecordWriter getRecordWriter(org.apache.hadoop.mapreduce.TaskAttemptContext context)
                                                  throws IOException

Throws:

IOException

getBounds

org.apache.commons.lang3.tuple.Pair<String,String> getBounds(org.apache.hadoop.conf.Configuration conf,
                                                             String partitionColumn,
                                                             boolean lower,
                                                             boolean upper)
                                                      throws HiveJdbcDatabaseAccessException

Throws:

HiveJdbcDatabaseAccessException

needColumnQuote

boolean needColumnQuote()