Package org.firebirdsql.jdbc

Class FBTpbMapper

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Cloneable
    public final class FBTpbMapper
extends java.lang.Object
implements java.io.Serializable, java.lang.Cloneable
    This class is provides mapping capabilities between standard JDBC transaction isolation level and Firebird Transaction Parameters Block (TPB).
    Author:
    Roman Rokytskyy
    See Also:
    Serialized Form

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static java.lang.String TRANSACTION_NONE
      Indicates that transactions are not supported.
      static java.lang.String TRANSACTION_READ_COMMITTED
      Dirty reads are prevented; non-repeatable reads and phantom reads can occur.
      static java.lang.String TRANSACTION_READ_UNCOMMITTED
      Dirty reads, non-repeatable reads and phantom reads can occur.
      static java.lang.String TRANSACTION_REPEATABLE_READ
      Dirty reads and non-repeatable reads are prevented; phantom reads can occur.
      static java.lang.String TRANSACTION_SERIALIZABLE
      Dirty reads, non-repeatable reads and phantom reads are prevented.

    • Constructor Summary

      Constructors 
      Constructor Description
      FBTpbMapper()
      Create instance of this class with the default mapping of JDBC transaction isolation levels to Firebird TPB.
      FBTpbMapper​(java.lang.String mappingResource, java.lang.ClassLoader cl)
      Create instance of this class and load mapping from the specified resource.
      FBTpbMapper​(java.util.Map<java.lang.String,​java.lang.String> stringMapping)
      Create instance of this class for the specified string mapping.

    • Field Detail

      • TRANSACTION_SERIALIZABLE

        public static final java.lang.String TRANSACTION_SERIALIZABLE
        Dirty reads, non-repeatable reads and phantom reads are prevented. This level includes the prohibitions in TRANSACTION_REPEATABLE_READ and further prohibits the situation where one transaction reads all rows that satisfy a WHERE condition, a second transaction inserts a row that satisfies that WHERE condition, and the first transaction rereads for the same condition, retrieving the additional "phantom" row in the second read.
        See Also:
        Constant Field Values

      • TRANSACTION_REPEATABLE_READ

        public static final java.lang.String TRANSACTION_REPEATABLE_READ
        Dirty reads and non-repeatable reads are prevented; phantom reads can occur. This level prohibits a transaction from reading a row with uncommitted changes in it, and it also prohibits the situation where one transaction reads a row, a second transaction alters the row, and the first transaction rereads the row, getting different values the second time (a "non-repeatable read").
        See Also:
        Constant Field Values

      • TRANSACTION_READ_COMMITTED

        public static final java.lang.String TRANSACTION_READ_COMMITTED
        Dirty reads are prevented; non-repeatable reads and phantom reads can occur. This level only prohibits a transaction from reading a row with uncommitted changes in it.
        See Also:
        Constant Field Values

      • TRANSACTION_READ_UNCOMMITTED

        public static final java.lang.String TRANSACTION_READ_UNCOMMITTED
        Dirty reads, non-repeatable reads and phantom reads can occur. This level allows a row changed by one transaction to be read by another transaction before any changes in that row have been committed (a "dirty read"). If any of the changes are rolled back, the second transaction will have retrieved an invalid row. This level is not actually supported
        See Also:
        Constant Field Values

      • TRANSACTION_NONE

        public static final java.lang.String TRANSACTION_NONE
        Indicates that transactions are not supported. This level is not supported
        See Also:
        Constant Field Values

    • Constructor Detail

      • FBTpbMapper

        public FBTpbMapper()
        Create instance of this class with the default mapping of JDBC transaction isolation levels to Firebird TPB.

      • FBTpbMapper

        public FBTpbMapper​(java.util.Map<java.lang.String,​java.lang.String> stringMapping)
            throws java.sql.SQLException
        Create instance of this class for the specified string mapping.
        Parameters:
        stringMapping - mapping of JDBC transaction isolation to Firebird mapping. Keys and values of this map must be strings. Keys can have the following values:
        • "TRANSACTION_SERIALIZABLE"
        • "TRANSACTION_REPEATABLE_READ"
        • "TRANSACTION_READ_COMMITTED"
        • "TRANSACTION_READ_UNCOMMITTED"
        Values are specified as comma-separated list of following keywords:
        • "isc_tpb_consistency"
        • "isc_tpb_concurrency"
        • "isc_tpb_read_committed"
        • "isc_tpb_rec_version"
        • "isc_tpb_no_rec_version"
        • "isc_tpb_wait"
        • "isc_tpb_nowait"
        • "isc_tpb_read"
        • "isc_tpb_write"
        • "isc_tpb_lock_read"
        • "isc_tpb_lock_write"
        • "isc_tpb_shared"
        • "isc_tpb_protected"
        It is also allowed to strip "isc_tpb_" prefix from above shown constants. Meaning of these constants and possible combinations you can find in a documentation.
        Throws:
        java.sql.SQLException - if mapping contains incorrect values.

      • FBTpbMapper

        public FBTpbMapper​(java.lang.String mappingResource,
                   java.lang.ClassLoader cl)
            throws java.sql.SQLException
        Create instance of this class and load mapping from the specified resource.
        Parameters:
        mappingResource - name of the resource to load.
        cl - class loader that should be used to load specified resource.
        Throws:
        java.sql.SQLException - if resource cannot be loaded or contains incorrect values.

    • Method Detail

      • getDefaultMapper

        public static FBTpbMapper getDefaultMapper()

      • getTransactionIsolationName

        public static java.lang.String getTransactionIsolationName​(int isolationLevel)
        Convert transaction isolation level into string.
        Parameters:
        isolationLevel - transaction isolation level as integer constant.
        Returns:
        corresponding string representation.

      • getTransactionIsolationLevel

        public static int getTransactionIsolationLevel​(java.lang.String isolationName)
        Convert transaction isolation level name into a corresponding constant.
        Parameters:
        isolationName - name of the transaction isolation.
        Returns:
        corresponding constant.

      • processMapping

        public static void processMapping​(FirebirdConnectionProperties connectionProperties,
                                  java.util.Properties info)
                           throws java.sql.SQLException
        This method extracts TPB mapping information from the connection parameters and adds it to the connectionProperties. The following format is supported:

        info contains separate mappings for each of following transaction isolation levels: "TRANSACTION_SERIALIZABLE", "TRANSACTION_REPEATABLE_READ" and "TRANSACTION_READ_COMMITTED".

        Parameters:
        connectionProperties - FirebirdConnectionProperties to set transaction state
        info - connection parameters passed into a driver.
        Throws:
        java.sql.SQLException - if specified mapping is incorrect.
        See Also:
        processMapping(FirebirdConnectionProperties, Map)

      • processMapping

        public static void processMapping​(FirebirdConnectionProperties connectionProperties,
                                  java.util.Map<java.lang.String,​java.lang.String> info)
                           throws java.sql.SQLException
        This method extracts TPB mapping information from the connection parameters and adds it to the connectionProperties. The following format is supported:

        info contains separate mappings for each of following transaction isolation levels: "TRANSACTION_SERIALIZABLE", "TRANSACTION_REPEATABLE_READ" and "TRANSACTION_READ_COMMITTED".

        Parameters:
        connectionProperties - FirebirdConnectionProperties to set transaction state
        info - connection parameters passed into a driver.
        Throws:
        java.sql.SQLException - if specified mapping is incorrect.
        See Also:
        processMapping(FirebirdConnectionProperties, Properties)

      • processMapping

        public static TransactionParameterBuffer processMapping​(java.lang.String mapping)
                                                 throws java.sql.SQLException
        Process comma-separated list of keywords and convert them into TPB values.
        Parameters:
        mapping - comma-separated list of keywords.
        Returns:
        set containing values corresponding to the specified keywords.
        Throws:
        java.sql.SQLException - if mapping contains keyword that is not a TPB parameter.

      • getMapping

        public TransactionParameterBuffer getMapping​(int transactionIsolation)
        Get mapping for the specified transaction isolation level.
        Parameters:
        transactionIsolation - transaction isolation level.
        Returns:
        set with TPB parameters.
        Throws:
        java.lang.IllegalArgumentException - if specified transaction isolation level is unknown.

      • setMapping

        public void setMapping​(int transactionIsolation,
                       TransactionParameterBuffer tpb)
        Set mapping for the specified transaction isolation.
        Parameters:
        transactionIsolation - transaction isolation level.
        tpb - TPB parameters.
        Throws:
        java.lang.IllegalArgumentException - if incorrect isolation level is specified.

      • getDefaultMapping

        public TransactionParameterBuffer getDefaultMapping()
        Get default mapping. Default mapping represents a TPB mapping for the default transaction isolation level (read committed).
        Returns:
        mapping for the default transaction isolation level.

      • equals

        public boolean equals​(java.lang.Object obj)
        Overrides:
        equals in class java.lang.Object

      • hashCode

        public int hashCode()
        Overrides:
        hashCode in class java.lang.Object

      • clone

        public java.lang.Object clone()
        Overrides:
        clone in class java.lang.Object