Data access patterns: database interactions in by Clifton Nock

By Clifton Nock

Effective, fine quality facts entry code is essential to the functionality and value of almost any company application-and there is no greater technique to increase an latest approach than to optimize its facts entry code. despite database engine, platform, language, or software, builders many times come upon a similar relational database entry demanding situations. In info entry styles, Clifton Nock identifies 25 confirmed suggestions, proposing each within the type of a transparent, easy-to-use trend. those styles remedy an extremely wide variety of difficulties together with growing effective database-independent functions, hiding imprecise database semantics from clients, rushing database source initialization, simplifying improvement and upkeep, enhancing help for concurrency and transactions, and casting off info entry bottlenecks.

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Void update(String table, Row selectionRow, Row updateRow) throws DataException; Part 1: Decoupling Patterns 37 38 Part 1: Decoupling Patterns /** Deletes data from a table. @param table The table. @param selectionRow A set of filter columns and values used to subset the rows, or null to delete all of the rows in the table. **/ void delete(String table, Row selectionRow) throws DataException; } ConcreteDataAccessor is a DataAccessor implementation that operates in terms of multiple JDBC connections.

When domain objects are not well-designed or versatile enough for an application's data access requirements, the application code may need to resort to unnatural or awkward workarounds that ultimately lead to unexpected results. 50 Part 1: Decoupling Patterns Part 1: Decoupling Patterns 51 [ Team LiB ] [ Team LiB ] Strategies As you define domain objects to use in applications, it is important to decide whether to model application concepts or data model concepts more closely. If you are creating an application and its data model from scratch, then you can align these concepts so they match.

Next(); // Generate the SQL INSERT statement based on // the caller's input. append(resolveQualifiedTable(table)); // List the column names. next()); } // List the column values. append( generateLiteralValue(columnValue)); } // Resolve the appropriate connection for 40 Part 1: Decoupling Patterns Part 1: Decoupling Patterns 41 // this table. Connection connection = resolveConnection(table); synchronized(connection) { // Execute the insert. close(); } } } catch(SQLException e) { throw new DataException( "Unable to insert into table " + table, e); } } /** Updates data in a table.

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