Examples of oracle.toplink.essentials.internal.databaseaccess.DatabasePlatform

Package oracle.toplink.essentials.internal.databaseaccess

Examples of oracle.toplink.essentials.internal.databaseaccess.DatabasePlatform

oracle.toplink.essentials.internal.databaseaccess.DatabasePlatform
DatabasePlatform is private to TopLink. It encapsulates behavior specific to a database platform (eg. Oracle, Sybase, DBase), and provides protocol for TopLink to access this behavior. The behavior categories which require platform specific handling are SQL generation and sequence behavior. While database platform currently provides sequence number retrieval behaviour, this will move to a sequence manager (when it is implemented). @see AccessPlatform @see DB2Platform @see DBasePlatform @see OraclePlatform @see SybasePlatform @since TOPLink/Java 1.0


    /**
    * INTERNAL:
    */
    public void onConnect() {
        DatabasePlatform dbPlatform = null;
        try {
            dbPlatform = (DatabasePlatform)getDatasourcePlatform();
        } catch (ClassCastException ex) {
            if (getSelectQuery() == null) {
                throw ValidationException.platformDoesNotSupportSequence(getName(), Helper.getShortClassName(getDatasourcePlatform()), Helper.getShortClassName(this));
            }
        }
        if (!dbPlatform.supportsNativeSequenceNumbers() && (getSelectQuery() == null)) {
            throw ValidationException.platformDoesNotSupportSequence(getName(), Helper.getShortClassName(getDatasourcePlatform()), Helper.getShortClassName(this));
        }
        // Set shouldAcquireValueAfterInsert flag: identity -> true; sequence objects -> false.
        if(dbPlatform.supportsIdentity() && shouldUseIdentityIfPlatformSupports()) {
            // identity is both supported by platform and desired by the NativeSequence
            setShouldAcquireValueAfterInsert(true);
        } else if(dbPlatform.supportsSequenceObjects() && !shouldUseIdentityIfPlatformSupports()) {
            // sequence objects is both supported by platform and desired by the NativeSequence
            setShouldAcquireValueAfterInsert(false);
        } else {
            if(dbPlatform.supportsNativeSequenceNumbers()) {
                // platform support contradicts to NativeSequence setting - go with platform supported choice.
                // platform must support either identity or sequence objects (otherwise ValidationException would've been thrown earlier),
                // therefore here dbPlatform.supportsIdentity() == !dbPlatform.supportsSequenceObjects().
                setShouldAcquireValueAfterInsert(dbPlatform.supportsIdentity());
            }
        }
        setShouldUseTransaction(dbPlatform.shouldNativeSequenceUseTransaction());
        super.onConnect();
    }

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    /**
     * PUBLIC:
     * Create a new login.
     */
    public DatabaseLogin() {
        this(new DatabasePlatform());
    }

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    public void useAccess() {
        if (getPlatform().isAccess()) {
            return;
        }


        DatabasePlatform newPlatform = new AccessPlatform();
        getPlatform().copyInto(newPlatform);
        setPlatform(newPlatform);
    }

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    public void useCloudscape() {
        if (getPlatform().isCloudscape()) {
            return;
        }


        DatabasePlatform newPlatform = new CloudscapePlatform();
        getPlatform().copyInto(newPlatform);
        setPlatform(newPlatform);
    }

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    public void useDerby() {
        if (getPlatform().isDerby()) {
            return;
        }


        DatabasePlatform newPlatform = new DerbyPlatform();
        getPlatform().copyInto(newPlatform);
        setPlatform(newPlatform);
    }

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    public void useDB2() {
        if (getPlatform().isDB2()) {
            return;
        }


        DatabasePlatform newPlatform = new DB2Platform();
        getPlatform().copyInto(newPlatform);
        setPlatform(newPlatform);
    }

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    public void useDBase() {
        if (getPlatform().isDBase()) {
            return;
        }


        DatabasePlatform newPlatform = new DBasePlatform();
        getPlatform().copyInto(newPlatform);
        setPlatform(newPlatform);
    }

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    public void useHSQL() {
        if (getPlatform().isHSQL()) {
            return;
        }


        DatabasePlatform newPlatform = new HSQLPlatform();
        getPlatform().copyInto(newPlatform);
        setPlatform(newPlatform);
    }

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    public void useInformix() {
        if (getPlatform().isInformix()) {
            return;
        }


        DatabasePlatform newPlatform = new InformixPlatform();
        getPlatform().copyInto(newPlatform);
        setPlatform(newPlatform);
    }

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    /**
     * PUBLIC:
     * Set the database platform to be JDBC.
     */
    public void useJDBC() {
        DatabasePlatform newPlatform = new DatabasePlatform();
        getPlatform().copyInto(newPlatform);
        setPlatform(newPlatform);
    }

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Related Classes of oracle.toplink.essentials.internal.databaseaccess.DatabasePlatform

oracle.toplink.essentials.descriptors.ClassDescriptor

oracle.toplink.essentials.sequencing.NativeSequence

oracle.toplink.essentials.sessions.DatabaseLogin

oracle.toplink.essentials.tools.schemaframework.FieldDefinition

oracle.toplink.essentials.tools.schemaframework.TableDefinition

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