Examples of org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor

Package org.eclipse.persistence.internal.databaseaccess

Examples of org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor

org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor
INTERNAL: DatabaseAccessor is private to EclipseLink. It encapsulates low level database operations (such as executing SQL and reading data by row). Database accessor defines a protocol by which EclipseLink may invoke these operations.
DatabaseAccessor also defines a single reference through which all configuration dependent behavior may be invoked.
DabaseAccessor implements the following behavior.
- Connect and disconnect from the database.
- Execute SQL statements on the database, returning results.
- Handle auto-commit and transactions.
DatabaseAccessor dispatches the following protocols to its platform reference.
- Provision of database platform specific type names.
DatabaseAccessor dispatches the following protocols to the schema object.
- Creation and deletion of schema objects.
@see DatabasePlatform @since TOPLink/Java 1.0

     * INTERNAL:
     * Build and return an appropriate Accessor.
     * The default is a DatabaseAccessor.
     */
    public Accessor buildAccessor() {
        return new DatabaseAccessor();
    }

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     * execute statement was issued by the user.
     */
    protected List buildResultRecords(ResultSet resultSet) {
        try {
            AbstractSession session = (AbstractSession) getActiveSession();
            DatabaseAccessor accessor = (DatabaseAccessor) executeCall.getQuery().getAccessor();
            
            executeCall.setFields(null);
            executeCall.matchFieldOrder(resultSet, accessor, session);
            ResultSetMetaData metaData = resultSet.getMetaData();
            
            List result =  new Vector();
            while (resultSet.next()) {
                result.add(accessor.fetchRow(executeCall.getFields(), executeCall.getFieldsArray(), resultSet, metaData, session));
            }
    
            // The result set must be closed in case the statement is cached and not closed.
            resultSet.close();

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                session.releaseReadConnection(accessor);
            }
        
            try {
                if (executeStatement != null) {
                    DatabaseAccessor accessor = (DatabaseAccessor) query.getAccessor();
                    accessor.releaseStatement(executeStatement, query.getSQLString(), executeCall, session);
                }
            } catch (SQLException exception) {
                // Catch the exception and log a message.
                session.log(SessionLog.WARNING, SessionLog.CONNECTION, "exception_caught_closing_statement", exception);
            }

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                // !cp.shouldAddAll() - query with SortedListContainerPolicy - currently does not use this method 
                boolean quickAdd = (domainObjects instanceof Collection) && !this.hasWrapperPolicy;
                ResultSetMetaData metaData = resultSet.getMetaData();
                ResultSetRecord row = null;
                AbstractSession executionSession = query.getExecutionSession();
                DatabaseAccessor dbAccessor = (DatabaseAccessor)query.getAccessor();
                if (this.isSimple) {
                    // None of the fields are relational - the row could be reused, just clear all the values.
                    row = new SimpleResultSetRecord(fields, fieldsArray, resultSet, metaData, dbAccessor, executionSession);
                    if (this.descriptor.isDescriptorTypeAggregate()) {
                        // Aggregate Collection may have an unmapped primary key referencing the owner, the corresponding field will not be used when the object is populated and therefore may not be cleared.

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        } else {
            // A connection was provided. Build a database session using that 
            // connection and use the same log level set on the original 
            // database session.
            DatabaseSessionImpl newDatabaseSession = new DatabaseSessionImpl();
            newDatabaseSession.setAccessor(new DatabaseAccessor(connection));
            newDatabaseSession.setLogLevel(databaseSession.getLogLevel());
            newDatabaseSession.setProject(databaseSession.getProject().clone());
            return newDatabaseSession;
        }
    }

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