org.datanucleus.store.rdbms.adapter

Class DB2Adapter

java.lang.Object

org.datanucleus.store.rdbms.adapter.BaseDatastoreAdapter

org.datanucleus.store.rdbms.adapter.DB2Adapter

All Implemented Interfaces:

DatastoreAdapter

Direct Known Subclasses:

DB2AS400Adapter

public class DB2Adapter
extends BaseDatastoreAdapter

Provides methods for adapting SQL language elements to the DB2 database.

See Also:

BaseDatastoreAdapter

Field Summary

Fields

Modifier and Type	Field and Description
static String	DB2_RESERVED_WORDS A string containing the list of DB2 keywords This list is normally obtained dynamically from the driver using "DatabaseMetaData.getSQLKeywords()".

Fields inherited from class org.datanucleus.store.rdbms.adapter.BaseDatastoreAdapter

catalogSeparator, datastoreMajorVersion, datastoreMinorVersion, datastoreProductName, datastoreProductVersion, datastoreRevisionVersion, driverMajorVersion, driverMinorVersion, driverName, driverVersion, identifierQuoteString, maxColumnNameLength, maxConstraintNameLength, maxIndexNameLength, maxTableNameLength, properties, reservedKeywords, supportedJdbcTypesById, supportedOptions, unsupportedJdbcTypesById

Fields inherited from interface org.datanucleus.store.rdbms.adapter.DatastoreAdapter

ACCESS_PARENTQUERY_IN_SUBQUERY_JOINED, ALLOW_TABLE_ALIAS_IN_UPDATE_SET_CLAUSE, ALTER_TABLE_DROP_CONSTRAINT_SYNTAX, ALTER_TABLE_DROP_FOREIGN_KEY_CONSTRAINT, ANALYSIS_METHODS, ANSI_CROSSJOIN_SYNTAX, ANSI_JOIN_SYNTAX, AUTO_INCREMENT_COLUMN_TYPE_SPECIFICATION, AUTO_INCREMENT_KEYS_NULL_SPECIFICATION, AUTO_INCREMENT_PK_IN_CREATE_TABLE_COLUMN_DEF, BIT_IS_REALLY_BOOLEAN, BLOB_SET_USING_SETSTRING, BOOLEAN_COMPARISON, CATALOGS_IN_TABLE_DEFINITIONS, CHAR_COLUMNS_PADDED_WITH_SPACES, CHECK_IN_CREATE_STATEMENTS, CHECK_IN_END_CREATE_STATEMENTS, CLOB_SET_USING_SETSTRING, CREATE_INDEXES_BEFORE_FOREIGN_KEYS, CROSSJOIN_ASINNER11_SYNTAX, DATETIME_STORES_MILLISECS, DEFAULT_BEFORE_NULL_IN_COLUMN_OPTIONS, DEFAULT_KEYWORD_IN_COLUMN_OPTIONS, DEFAULT_KEYWORD_WITH_NOT_NULL_IN_COLUMN_OPTIONS, DEFERRED_CONSTRAINTS, DISTINCT_WITH_SELECT_FOR_UPDATE, ESCAPE_EXPRESSION_IN_LIKE_PREDICATE, EXISTS_SYNTAX, FK_DELETE_ACTION_CASCADE, FK_DELETE_ACTION_DEFAULT, FK_DELETE_ACTION_NULL, FK_DELETE_ACTION_RESTRICT, FK_IN_END_CREATE_STATEMENTS, FK_UPDATE_ACTION_CASCADE, FK_UPDATE_ACTION_DEFAULT, FK_UPDATE_ACTION_NULL, FK_UPDATE_ACTION_RESTRICT, GET_GENERATED_KEYS_STATEMENT, HOLD_CURSORS_OVER_COMMIT, IDENTIFIERS_LOWERCASE, IDENTIFIERS_LOWERCASE_QUOTED, IDENTIFIERS_MIXEDCASE, IDENTIFIERS_MIXEDCASE_QUOTED, IDENTIFIERS_MIXEDCASE_QUOTED_SENSITIVE, IDENTIFIERS_MIXEDCASE_SENSITIVE, IDENTIFIERS_UPPERCASE, IDENTIFIERS_UPPERCASE_QUOTED, IDENTITY_COLUMNS, INCLUDE_ORDERBY_COLS_IN_SELECT, LOCK_OPTION_PLACED_AFTER_FROM, LOCK_OPTION_PLACED_WITHIN_JOIN, LOCK_WITH_SELECT_FOR_UPDATE, NULL_EQUALS_EMPTY_STRING, NULLS_IN_CANDIDATE_KEYS, NULLS_KEYWORD_IN_COLUMN_OPTIONS, ORDERBY_NULLS_DIRECTIVES, ORDERBY_USING_SELECT_COLUMN_INDEX, PERSIST_OF_UNASSIGNED_CHAR, PRIMARYKEY_IN_CREATE_STATEMENTS, PROJECTION_IN_TABLE_REFERENCE_JOINS, RESULTSET_TYPE_FORWARD_ONLY, RESULTSET_TYPE_SCROLL_INSENSITIVE, RESULTSET_TYPE_SCROLL_SENSITIVE, SCHEMAS_IN_TABLE_DEFINITIONS, SEQUENCES, STATEMENT_BATCHING, STORED_PROCEDURES, TX_ISOLATION_NONE, TX_ISOLATION_READ_COMMITTED, TX_ISOLATION_READ_UNCOMMITTED, TX_ISOLATION_REPEATABLE_READ, TX_ISOLATION_SERIALIZABLE, UNION_SYNTAX, UNIQUE_IN_END_CREATE_STATEMENTS, USE_UNION_ALL, VIEWS

Constructor Summary

Constructors

Constructor and Description
DB2Adapter(DatabaseMetaData metadata) Constructs a DB2 adapter based on the given JDBC metadata.

Method Summary

Modifier and Type	Method and Description
String	getAutoIncrementKeyword() Accessor for the auto-increment keyword for generating DDLs (CREATE TABLEs...).
String	getAutoIncrementStmt(Table table, String columnName) Accessor for the auto-increment sql statement for this datastore.
String	getContinuationString() Continuation string to use where the SQL statement goes over more than 1 line.
int	getDatastoreIdentifierMaxLength(IdentifierType identifierType) Method to return the maximum length of a datastore identifier of the specified type.
String	getDropDatabaseStatement(String schemaName, String catalogName) Method to return the statement necessary to drop a database with this RDBMS.
String	getDropTableStatement(Table table) Returns the appropriate SQL to drop the given table.
String	getRangeByRowNumberColumn() Method to return the column name to use when handling ranges via a rownumber on the select using the original method (DB2).
String	getSchemaName(Connection conn) Accessor for the Schema Name for this datastore.
String	getSequenceCreateStmt(String sequence_name, Integer min, Integer max, Integer start, Integer increment, Integer cache_size) Accessor for the sequence statement to create the sequence.
String	getSequenceNextStmt(String sequence_name) Accessor for the statement for getting the next id from the sequence for this datastore.
String	getVendorID() Accessor for the Vendor ID for this datastore.
void	initialiseTypes(org.datanucleus.store.schema.StoreSchemaHandler handler, org.datanucleus.store.connection.ManagedConnection mconn) Initialise the types for this datastore.
boolean	isStatementCancel(SQLException sqle) return whether this exception represents a cancelled statement.
boolean	isStatementTimeout(SQLException sqle) return whether this exception represents a timed out statement.
RDBMSColumnInfo	newRDBMSColumnInfo(ResultSet rs) Method to create a column info for the current row.
SQLTypeInfo	newSQLTypeInfo(ResultSet rs) Create a new SQL type info from the current row of the passed ResultSet.

Methods inherited from class org.datanucleus.store.rdbms.adapter.BaseDatastoreAdapter

addSQLTypeForJDBCType, getAdapterTime, getAddCandidateKeyStatement, getAddColumnStatement, getAddForeignKeyStatement, getAddPrimaryKeyStatement, getAutoIncrementJavaTypeForType, getCatalogName, getCatalogSeparator, getCheckConstraintForValues, getColumns, getCreateDatabaseStatement, getCreateIndexStatement, getCreateTableStatement, getDatastoreDateStatement, getDatastoreDriverName, getDatastoreDriverVersion, getDatastoreProductName, getDatastoreProductVersion, getDeleteTableStatement, getDriverMajorVersion, getDriverMinorVersion, getDropViewStatement, getEscapeCharacter, getEscapePatternExpression, getExistingIndexes, getIdentifierQuoteString, getInsertStatementForNoColumns, getJDBCTypeForName, getMappingManager, getMaxForeignKeys, getMaxIndexes, getMiliseconds, getNameForJDBCType, getNewUUIDFunction, getNumericConversionFunction, getOperatorConcat, getOrderString, getPatternExpressionAnyCharacter, getPatternExpressionZeroMoreCharacters, getRangeByLimitEndOfStatementClause, getRangeByRowNumberColumn2, getRequiredTransactionIsolationLevel, getSelectForUpdateText, getSelectNewUUIDStmt, getSelectWithLockOption, getSQLTypeInfoForJdbcType, getSupportedOptions, getSurrogateForEmptyStrings, getTime, getTransactionIsolationForSchemaCreation, getUnlimitedLengthPrecisionValue, getUpdateTableStatement, getValueForProperty, initialiseDatastore, isIdentityFieldDataType, isReservedKeyword, isValidPrimaryKeyType, iteratorReservedWords, newFKInfo, removeUnsupportedMappings, sequenceExists, setProperties, supportsOption, supportsQueryFetchSize, supportsTransactionIsolation, toString, validToSelectMappingInStatement

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

DB2_RESERVED_WORDS

public static final String DB2_RESERVED_WORDS

A string containing the list of DB2 keywords This list is normally obtained dynamically from the driver using "DatabaseMetaData.getSQLKeywords()". Based on database DB2 version 7.

See Also:

Constant Field Values

Constructor Detail

DB2Adapter

public DB2Adapter(DatabaseMetaData metadata)

Constructs a DB2 adapter based on the given JDBC metadata.

Parameters:

metadata - the database metadata.

Method Detail

initialiseTypes

public void initialiseTypes(org.datanucleus.store.schema.StoreSchemaHandler handler,
                            org.datanucleus.store.connection.ManagedConnection mconn)

Initialise the types for this datastore.

Specified by:

initialiseTypes in interface DatastoreAdapter

Overrides:

initialiseTypes in class BaseDatastoreAdapter

Parameters:

handler - SchemaHandler that we initialise the types for

mconn - Managed connection to use

getVendorID

public String getVendorID()

Description copied from interface: DatastoreAdapter

Accessor for the Vendor ID for this datastore.

Specified by:

getVendorID in interface DatastoreAdapter

Overrides:

getVendorID in class BaseDatastoreAdapter

Returns:

Vendor id for this datastore

getSchemaName

public String getSchemaName(Connection conn)
                     throws SQLException

Description copied from class: BaseDatastoreAdapter

Accessor for the Schema Name for this datastore.

Specified by:

getSchemaName in interface DatastoreAdapter

Overrides:

getSchemaName in class BaseDatastoreAdapter

Parameters:

conn - Connection to the datastore

Returns:

The schema name

Throws:

SQLException - Thrown if error occurs in determining the schema name.

getDatastoreIdentifierMaxLength

public int getDatastoreIdentifierMaxLength(IdentifierType identifierType)

Method to return the maximum length of a datastore identifier of the specified type. If no limit exists then returns -1

Specified by:

getDatastoreIdentifierMaxLength in interface DatastoreAdapter

Overrides:

getDatastoreIdentifierMaxLength in class BaseDatastoreAdapter

Parameters:

identifierType - Type of identifier (see IdentifierFactory.TABLE, etc)

Returns:

The max permitted length of this type of identifier

newSQLTypeInfo

public SQLTypeInfo newSQLTypeInfo(ResultSet rs)

Description copied from interface: DatastoreAdapter

Create a new SQL type info from the current row of the passed ResultSet. Allows an adapter to override particular types where the JDBC driver is known to be buggy.

Specified by:

newSQLTypeInfo in interface DatastoreAdapter

Overrides:

newSQLTypeInfo in class BaseDatastoreAdapter

Parameters:

rs - ResultSet

Returns:

The SQL type info

newRDBMSColumnInfo

public RDBMSColumnInfo newRDBMSColumnInfo(ResultSet rs)

Method to create a column info for the current row. Overrides the dataType/columnSize/decimalDigits to cater for DB2 particularities.

Specified by:

newRDBMSColumnInfo in interface DatastoreAdapter

Overrides:

newRDBMSColumnInfo in class BaseDatastoreAdapter

Parameters:

rs - ResultSet from DatabaseMetaData.getColumns()

Returns:

column info

getDropDatabaseStatement

public String getDropDatabaseStatement(String schemaName,
                                       String catalogName)

Description copied from interface: DatastoreAdapter

Method to return the statement necessary to drop a database with this RDBMS. Note that some RDBMS don't support this.

Specified by:

getDropDatabaseStatement in interface DatastoreAdapter

Overrides:

getDropDatabaseStatement in class BaseDatastoreAdapter

Parameters:

schemaName - Name of the catalog

catalogName - Name of the schema

Returns:

The DDL statement

getDropTableStatement

public String getDropTableStatement(Table table)

Description copied from class: BaseDatastoreAdapter

Returns the appropriate SQL to drop the given table. It should return something like:

 DROP TABLE FOO CASCADE
 

Specified by:

getDropTableStatement in interface DatastoreAdapter

Overrides:

getDropTableStatement in class BaseDatastoreAdapter

Parameters:

table - The table to drop.

Returns:

The text of the SQL statement.

getAutoIncrementStmt

public String getAutoIncrementStmt(Table table,
                                   String columnName)

Accessor for the auto-increment sql statement for this datastore.

Specified by:

getAutoIncrementStmt in interface DatastoreAdapter

Overrides:

getAutoIncrementStmt in class BaseDatastoreAdapter

Parameters:

table - Name of the table that the autoincrement is for

columnName - Name of the column that the autoincrement is for

Returns:

The statement for getting the latest auto-increment key

getAutoIncrementKeyword

public String getAutoIncrementKeyword()

Accessor for the auto-increment keyword for generating DDLs (CREATE TABLEs...).

Specified by:

getAutoIncrementKeyword in interface DatastoreAdapter

Overrides:

getAutoIncrementKeyword in class BaseDatastoreAdapter

Returns:

The keyword for a column using auto-increment

getContinuationString

public String getContinuationString()

Continuation string to use where the SQL statement goes over more than 1 line. DB2 doesn't convert newlines into continuation characters and so we just provide a space so that it accepts the statement.

Overrides:

getContinuationString in class BaseDatastoreAdapter

Returns:

Continuation string.

getSequenceCreateStmt

public String getSequenceCreateStmt(String sequence_name,
                                    Integer min,
                                    Integer max,
                                    Integer start,
                                    Integer increment,
                                    Integer cache_size)

Accessor for the sequence statement to create the sequence.

Specified by:

getSequenceCreateStmt in interface DatastoreAdapter

Overrides:

getSequenceCreateStmt in class BaseDatastoreAdapter

Parameters:

sequence_name - Name of the sequence

min - Minimum value for the sequence

max - Maximum value for the sequence

start - Start value for the sequence

increment - Increment value for the sequence

cache_size - Cache size for the sequence

Returns:

The statement for getting the next id from the sequence

getSequenceNextStmt

public String getSequenceNextStmt(String sequence_name)

Accessor for the statement for getting the next id from the sequence for this datastore.

Specified by:

getSequenceNextStmt in interface DatastoreAdapter

Overrides:

getSequenceNextStmt in class BaseDatastoreAdapter

Parameters:

sequence_name - Name of the sequence

Returns:

The statement for getting the next id for the sequence

getRangeByRowNumberColumn

public String getRangeByRowNumberColumn()

Description copied from class: BaseDatastoreAdapter

Method to return the column name to use when handling ranges via a rownumber on the select using the original method (DB2). Defaults to an empty string (not supported).

Specified by:

getRangeByRowNumberColumn in interface DatastoreAdapter

Overrides:

getRangeByRowNumberColumn in class BaseDatastoreAdapter

Returns:

The row number column.

isStatementCancel

public boolean isStatementCancel(SQLException sqle)

return whether this exception represents a cancelled statement.

Specified by:

isStatementCancel in interface DatastoreAdapter

Overrides:

isStatementCancel in class BaseDatastoreAdapter

Parameters:

sqle - the exception

Returns:

whether it is a cancel

isStatementTimeout

public boolean isStatementTimeout(SQLException sqle)

Description copied from class: BaseDatastoreAdapter

return whether this exception represents a timed out statement.

Specified by:

isStatementTimeout in interface DatastoreAdapter

Overrides:

isStatementTimeout in class BaseDatastoreAdapter

Parameters:

sqle - the exception

Returns:

whether it is a timeout