类 Oracle8iDialect

    • 构造器详细资料

      • Oracle8iDialect

        public Oracle8iDialect()
        Constructs an Oracle8iDialect
    • 方法详细资料

      • registerCharacterTypeMappings

        protected void registerCharacterTypeMappings()
      • registerNumericTypeMappings

        protected void registerNumericTypeMappings()
      • registerDateTimeTypeMappings

        protected void registerDateTimeTypeMappings()
      • registerLargeObjectTypeMappings

        protected void registerLargeObjectTypeMappings()
      • registerReverseHibernateTypeMappings

        protected void registerReverseHibernateTypeMappings()
      • registerFunctions

        protected void registerFunctions()
      • registerDefaultProperties

        protected void registerDefaultProperties()
      • getCrossJoinSeparator

        public String getCrossJoinSeparator()
        从类复制的说明: Dialect
        Returns the separator to use for defining cross joins when translating HQL queries.

        Typically this will be either [ cross join ] or [, ]

        Note that the spaces are important!

        覆盖:
        getCrossJoinSeparator 在类中 Dialect
        返回:
        The cross join separator
      • createCaseFragment

        public CaseFragment createCaseFragment()
        Map case support to the Oracle DECODE function. Oracle did not add support for CASE until 9i.

        Create a CaseFragment strategy responsible for handling this dialect's variations in how CASE statements are handled.

        覆盖:
        createCaseFragment 在类中 Dialect
        返回:
        This dialect's CaseFragment strategy.
      • getLimitHandler

        public LimitHandler getLimitHandler()
        从类复制的说明: Dialect
        Returns the delegate managing LIMIT clause.
        覆盖:
        getLimitHandler 在类中 Dialect
        返回:
        LIMIT clause delegate.
      • getLimitString

        public String getLimitString​(String sql,
                                     boolean hasOffset)
        从类复制的说明: Dialect
        Apply a limit clause to the query.

        Typically dialects utilize variable limit clauses when they support limits. Thus, when building the select command we do not actually need to know the limit or the offset since we will just be using placeholders.

        Here we do still pass along whether or not an offset was specified so that dialects not supporting offsets can generate proper exceptions. In general, dialects will override one or the other of this method and Dialect.getLimitString(String, int, int).

        覆盖:
        getLimitString 在类中 Dialect
        参数:
        sql - The query to which to apply the limit.
        hasOffset - Is the query requesting an offset?
        返回:
        the modified SQL
      • getBasicSelectClauseNullString

        public String getBasicSelectClauseNullString​(int sqlType)
        Allows access to the basic Dialect.getSelectClauseNullString(int) implementation...
        参数:
        sqlType - The Types mapping type code
        返回:
        The appropriate select clause fragment
      • getSelectClauseNullString

        public String getSelectClauseNullString​(int sqlType)
        从类复制的说明: Dialect
        Given a Types type code, determine an appropriate null value to use in a select clause.

        One thing to consider here is that certain databases might require proper casting for the nulls here since the select here will be part of a UNION/UNION ALL.

        覆盖:
        getSelectClauseNullString 在类中 Dialect
        参数:
        sqlType - The Types type code.
        返回:
        The appropriate select clause value fragment.
      • getCurrentTimestampSelectString

        public String getCurrentTimestampSelectString()
        从类复制的说明: Dialect
        Retrieve the command used to retrieve the current timestamp from the database.
        覆盖:
        getCurrentTimestampSelectString 在类中 Dialect
        返回:
        The command.
      • getCurrentTimestampSQLFunctionName

        public String getCurrentTimestampSQLFunctionName()
        从类复制的说明: Dialect
        The name of the database-specific SQL function for retrieving the current timestamp.
        覆盖:
        getCurrentTimestampSQLFunctionName 在类中 Dialect
        返回:
        The function name.
      • getAddColumnString

        public String getAddColumnString()
        从类复制的说明: Dialect
        The syntax used to add a column to a table (optional).
        覆盖:
        getAddColumnString 在类中 Dialect
        返回:
        The "add column" fragment.
      • getSequenceNextValString

        public String getSequenceNextValString​(String sequenceName)
        从类复制的说明: Dialect
        Generate the appropriate select statement to to retrieve the next value of a sequence.

        This should be a "stand alone" select statement.

        覆盖:
        getSequenceNextValString 在类中 Dialect
        参数:
        sequenceName - the name of the sequence
        返回:
        String The "nextval" select string.
      • getSelectSequenceNextValString

        public String getSelectSequenceNextValString​(String sequenceName)
        从类复制的说明: Dialect
        Generate the select expression fragment that will retrieve the next value of a sequence as part of another (typically DML) statement.

        This differs from Dialect.getSequenceNextValString(String) in that this should return an expression usable within another statement.

        覆盖:
        getSelectSequenceNextValString 在类中 Dialect
        参数:
        sequenceName - the name of the sequence
        返回:
        The "nextval" fragment.
      • getCreateSequenceString

        protected String getCreateSequenceString​(String sequenceName,
                                                 int initialValue,
                                                 int incrementSize)
        从类复制的说明: Dialect
        Overloaded form of Dialect.getCreateSequenceString(String), additionally taking the initial value and increment size to be applied to the sequence definition.

        The default definition is to suffix Dialect.getCreateSequenceString(String) with the string: " start with {initialValue} increment by {incrementSize}" where {initialValue} and {incrementSize} are replacement placeholders. Generally dialects should only need to override this method if different key phrases are used to apply the allocation information.
        覆盖:
        getCreateSequenceString 在类中 Dialect
        参数:
        sequenceName - The name of the sequence
        initialValue - The initial value to apply to 'create sequence' statement
        incrementSize - The increment value to apply to 'create sequence' statement
        返回:
        The sequence creation command
      • dropConstraints

        public boolean dropConstraints()
        从类复制的说明: Dialect
        Do we need to drop constraints before dropping tables in this dialect?
        覆盖:
        dropConstraints 在类中 Dialect
        返回:
        True if constraints must be dropped prior to dropping the table; false otherwise.
      • getForUpdateNowaitString

        public String getForUpdateNowaitString()
        从类复制的说明: Dialect
        Retrieves the FOR UPDATE NOWAIT syntax specific to this dialect.
        覆盖:
        getForUpdateNowaitString 在类中 Dialect
        返回:
        The appropriate FOR UPDATE NOWAIT clause string.
      • supportsSequences

        public boolean supportsSequences()
        从类复制的说明: Dialect
        Does this dialect support sequences?
        覆盖:
        supportsSequences 在类中 Dialect
        返回:
        True if sequences supported; false otherwise.
      • supportsLimit

        public boolean supportsLimit()
        从类复制的说明: Dialect
        Does this dialect support some form of limiting query results via a SQL clause?
        覆盖:
        supportsLimit 在类中 Dialect
        返回:
        True if this dialect supports some form of LIMIT.
      • getForUpdateString

        public String getForUpdateString​(String aliases)
        从类复制的说明: Dialect
        Get the FOR UPDATE OF column_list fragment appropriate for this dialect given the aliases of the columns to be write locked.
        覆盖:
        getForUpdateString 在类中 Dialect
        参数:
        aliases - The columns to be write locked.
        返回:
        The appropriate FOR UPDATE OF column_list clause string.
      • getForUpdateNowaitString

        public String getForUpdateNowaitString​(String aliases)
        从类复制的说明: Dialect
        Get the FOR UPDATE OF column_list NOWAIT fragment appropriate for this dialect given the aliases of the columns to be write locked.
        覆盖:
        getForUpdateNowaitString 在类中 Dialect
        参数:
        aliases - The columns to be write locked.
        返回:
        The appropriate FOR UPDATE OF colunm_list NOWAIT clause string.
      • bindLimitParametersInReverseOrder

        public boolean bindLimitParametersInReverseOrder()
        从类复制的说明: Dialect
        ANSI SQL defines the LIMIT clause to be in the form LIMIT offset, limit. Does this dialect require us to bind the parameters in reverse order?
        覆盖:
        bindLimitParametersInReverseOrder 在类中 Dialect
        返回:
        true if the correct order is limit, offset
      • useMaxForLimit

        public boolean useMaxForLimit()
        从类复制的说明: Dialect
        Does the LIMIT clause take a "maximum" row number instead of a total number of returned rows?

        This is easiest understood via an example. Consider you have a table with 20 rows, but you only want to retrieve rows number 11 through 20. Generally, a limit with offset would say that the offset = 11 and the limit = 10 (we only want 10 rows at a time); this is specifying the total number of returned rows. Some dialects require that we instead specify offset = 11 and limit = 20, where 20 is the "last" row we want relative to offset (i.e. total number of rows = 20 - 11 = 9)

        So essentially, is limit relative from offset? Or is limit absolute?

        覆盖:
        useMaxForLimit 在类中 Dialect
        返回:
        True if limit is relative from offset; false otherwise.
      • forUpdateOfColumns

        public boolean forUpdateOfColumns()
        从类复制的说明: Dialect
        Is FOR UPDATE OF syntax supported?
        覆盖:
        forUpdateOfColumns 在类中 Dialect
        返回:
        True if the database supports FOR UPDATE OF syntax; false otherwise.
      • getQuerySequencesString

        public String getQuerySequencesString()
        从类复制的说明: Dialect
        Get the select command used retrieve the names of all sequences.
        覆盖:
        getQuerySequencesString 在类中 Dialect
        返回:
        The select command; or null if sequences are not supported.
        另请参阅:
        SchemaUpdate
      • getSelectGUIDString

        public String getSelectGUIDString()
        从类复制的说明: Dialect
        Get the command used to select a GUID from the underlying database.

        Optional operation.

        覆盖:
        getSelectGUIDString 在类中 Dialect
        返回:
        The appropriate command.
      • buildSQLExceptionConversionDelegate

        public SQLExceptionConversionDelegate buildSQLExceptionConversionDelegate()
        从类复制的说明: Dialect
        Build an instance of a SQLExceptionConversionDelegate for interpreting dialect-specific error or SQLState codes.

        When Dialect.buildSQLExceptionConverter() returns null, the default SQLExceptionConverter is used to interpret SQLState and error codes. If this method is overridden to return a non-null value, the default SQLExceptionConverter will use the returned SQLExceptionConversionDelegate in addition to the following standard delegates:

        1. a "static" delegate based on the JDBC 4 defined SQLException hierarchy;
        2. a delegate that interprets SQLState codes for either X/Open or SQL-2003 codes, depending on java.sql.DatabaseMetaData#getSQLStateType

        It is strongly recommended that specific Dialect implementations override this method, since interpretation of a SQL error is much more accurate when based on the vendor-specific ErrorCode rather than the SQLState.

        Specific Dialects may override to return whatever is most appropriate for that vendor.

        覆盖:
        buildSQLExceptionConversionDelegate 在类中 Dialect
        返回:
        The SQLExceptionConversionDelegate for this dialect
      • registerResultSetOutParameter

        public int registerResultSetOutParameter​(CallableStatement statement,
                                                 int col)
                                          throws SQLException
        从类复制的说明: Dialect
        Registers a parameter (either OUT, or the new REF_CURSOR param type available in Java 8) capable of returning ResultSet *by position*. Pre-Java 8, registering such ResultSet-returning parameters varied greatly across database and drivers; hence its inclusion as part of the Dialect contract.
        覆盖:
        registerResultSetOutParameter 在类中 Dialect
        参数:
        statement - The callable statement.
        col - The bind position at which to register the output param.
        返回:
        The number of (contiguous) bind positions used.
        抛出:
        SQLException - Indicates problems registering the param.
      • supportsUnionAll

        public boolean supportsUnionAll()
        从类复制的说明: Dialect
        Does this dialect support UNION ALL, which is generally a faster variant of UNION?
        覆盖:
        supportsUnionAll 在类中 Dialect
        返回:
        True if UNION ALL is supported; false otherwise.
      • supportsCommentOn

        public boolean supportsCommentOn()
        从类复制的说明: Dialect
        Does this dialect/database support commenting on tables, columns, etc?
        覆盖:
        supportsCommentOn 在类中 Dialect
        返回:
        true if commenting is supported
      • supportsCurrentTimestampSelection

        public boolean supportsCurrentTimestampSelection()
        从类复制的说明: Dialect
        Does this dialect support a way to retrieve the database's current timestamp value?
        覆盖:
        supportsCurrentTimestampSelection 在类中 Dialect
        返回:
        True if the current timestamp can be retrieved; false otherwise.
      • supportsEmptyInList

        public boolean supportsEmptyInList()
        从类复制的说明: Dialect
        Does this dialect support empty IN lists?

        For example, is [where XYZ in ()] a supported construct?

        覆盖:
        supportsEmptyInList 在类中 Dialect
        返回:
        True if empty in lists are supported; false otherwise.
      • supportsExistsInSelect

        public boolean supportsExistsInSelect()
        从类复制的说明: Dialect
        Does the dialect support an exists statement in the select clause?
        覆盖:
        supportsExistsInSelect 在类中 Dialect
        返回:
        True if exists checks are allowed in the select clause; false otherwise.
      • getInExpressionCountLimit

        public int getInExpressionCountLimit()
        从类复制的说明: Dialect
        Return the limit that the underlying database places on the number of elements in an IN predicate. If the database defines no such limits, simply return zero or less-than-zero.
        覆盖:
        getInExpressionCountLimit 在类中 Dialect
        返回:
        int The limit, or zero-or-less to indicate no limit.
      • forceLobAsLastValue

        public boolean forceLobAsLastValue()
        从类复制的说明: Dialect
        HHH-4635 Oracle expects all Lob values to be last in inserts and updates.
        覆盖:
        forceLobAsLastValue 在类中 Dialect
        返回:
        boolean True if Lob values should be last, false if it does not matter.
      • useFollowOnLocking

        public boolean useFollowOnLocking​(QueryParameters parameters)
        For Oracle, the FOR UPDATE clause cannot be applied when using ORDER BY, DISTINCT or views.
        覆盖:
        useFollowOnLocking 在类中 Dialect
        参数:
        parameters -
        返回:
        true indicates that the dialect requests that locking be applied by subsequent select; false (the default) indicates that locking should be applied to the main SQL statement..
        另请参阅:
        Oracle FOR UPDATE restrictions
      • getNotExpression

        public String getNotExpression​(String expression)
        从类复制的说明: Dialect
        Negate an expression
        覆盖:
        getNotExpression 在类中 Dialect
        参数:
        expression - The expression to negate
        返回:
        The negated expression
      • getQueryHintString

        public String getQueryHintString​(String sql,
                                         String hints)
        从类复制的说明: Dialect
        Apply a hint to the query. The entire query is provided, allowing the Dialect full control over the placement and syntax of the hint. By default, ignore the hint and simply return the query.
        覆盖:
        getQueryHintString 在类中 Dialect
        参数:
        sql - The query to which to apply the hint.
        hints - The hints to apply
        返回:
        The modified SQL
      • getMaxAliasLength

        public int getMaxAliasLength()
        从类复制的说明: Dialect
        What is the maximum length Hibernate can use for generated aliases?

        The maximum here should account for the fact that Hibernate often needs to append "uniqueing" information to the end of generated aliases. That "uniqueing" information will be added to the end of a identifier generated to the length specified here; so be sure to leave some room (generally speaking 5 positions will suffice).

        覆盖:
        getMaxAliasLength 在类中 Dialect
        返回:
        The maximum length.
      • canCreateSchema

        public boolean canCreateSchema()
        从类复制的说明: Dialect
        Does this dialect support schema creation?
        覆盖:
        canCreateSchema 在类中 Dialect
        返回:
        True if the dialect supports schema creation; false otherwise.
      • supportsPartitionBy

        public boolean supportsPartitionBy()
        从类复制的说明: Dialect
        Does the underlying database support partition by
        覆盖:
        supportsPartitionBy 在类中 Dialect
        返回:
        boolean
      • statementType

        protected String statementType​(String sql)
      • supportsNoWait

        public boolean supportsNoWait()
        从类复制的说明: Dialect
        Does this dialect/database support NO_WAIT timeout.
        覆盖:
        supportsNoWait 在类中 Dialect
        返回:
        true if NO_WAIT is supported