Here's an example for Row Data Gateway It's a simple person table in Java

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Here's an example for Row Data Gateway It's a simple person table
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create table people (ID int primary key, lastname varchar, firstname varchar, number_of_dependents int)
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PersonGateway is a gateway for the table It starts with data fields and accessors
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class PersonGateway private String lastName; private String firstName; private int numberOfDependents; public String getLastName() { return lastName; } public void setLastName(String lastName) { thislastName = lastName; } public String getFirstName() { return firstName; } public void setFirstName(String firstName) { thisfirstName = firstName; } public int getNumberOfDependents() { return numberOfDependents; } public void setNumberOfDependents(int numberOfDependents) { thisnumberOfDependents = numberOfDependents; }
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The gateway class itself can handle updates and inserts
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class PersonGateway private static final String updateStatementString = "UPDATE people " +
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" set lastname = , firstname = , number_of_dependents = " + " where id = "; public void update() { PreparedStatement updateStatement = null; try { updateStatement = DBprepare(updateStatementString); updateStatementsetString(1, lastName); updateStatementsetString(2, firstName); updateStatementsetInt(3, numberOfDependents); updateStatementsetInt(4, getID()intValue()); updateStatementexecute(); } catch (Exception e) { throw new ApplicationException(e); } finally {DBcleanUp(updateStatement); } } private static final String insertStatementString = "INSERT INTO people VALUES ( , , , )"; public Long insert() { PreparedStatement insertStatement = null; try { insertStatement = DBprepare(insertStatementString); setID(findNextDatabaseId()); insertStatementsetInt(1, getID()intValue()); insertStatementsetString(2, lastName); insertStatementsetString(3, firstName); insertStatementsetInt(4, numberOfDependents); insertStatementexecute(); RegistryaddPerson(this); return getID(); } catch (SQLException e) { throw new ApplicationException(e); } finally {DBcleanUp(insertStatement); } }
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To pull people out of the database, we have a separate PersonFinder This works with the gateway to create new gateway objects
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class PersonFinder private final static String findStatementString = "SELECT id, lastname, firstname, number_of_dependents " + " from people " + " WHERE id = "; public PersonGateway find(Long id) { PersonGateway result = (PersonGateway) RegistrygetPerson(id); if (result != null) return result; PreparedStatement findStatement = null; ResultSet rs = null; try { findStatement = DBprepare(findStatementString); findStatementsetLong(1, idlongValue()); rs = findStatementexecuteQuery(); rsnext(); result = PersonGatewayload(rs); return result; } catch (SQLException e) { throw new ApplicationException(e); } finally {DBcleanUp(findStatement, rs); } } public PersonGateway find(long id) { return find(new Long(id)); } class PersonGateway
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public static PersonGateway load(ResultSet rs) throws SQLException { Long id = new Long(rsgetLong(1)); PersonGateway result = (PersonGateway) RegistrygetPerson(id); if (result != null) return result; String lastNameArg = rsgetString(2); String firstNameArg = rsgetString(3); int numDependentsArg = rsgetInt(4); result = new PersonGateway(id, lastNameArg, firstNameArg, numDependentsArg); RegistryaddPerson(result); return result; }
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To find more than one person according to some criteria we can provide a suitable finder method
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class PersonFinder private static final String findResponsibleStatement = "SELECT id, lastname, firstname, number_of_dependents " + " from people " + " WHERE number_of_dependents > 0"; public List findResponsibles() { List result = new ArrayList(); PreparedStatement stmt = null; ResultSet rs = null; try { stmt = DBprepare(findResponsibleStatement); rs = stmtexecuteQuery(); while (rsnext()) { resultadd(PersonGatewayload(rs)); } return result; } catch (SQLException e) { throw new ApplicationException(e); } finally {DBcleanUp(stmt, rs); } }
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The finder uses a Registry (480) to hold Identity Maps (195)
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We can now use the gateways from a Transaction Script (110)
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PersonFinder finder = new PersonFinder(); Iterator people = finderfindResponsibles()iterator(); StringBuffer result = new StringBuffer(); while (peoplehasNext()) { PersonGateway each = (PersonGateway) peoplenext(); resultappend(eachgetLastName()); resultappend(" "); resultappend(eachgetFirstName()); resultappend(" "); resultappend(StringvalueOf(eachgetNumberOfDependents())); resultappend(" } return resulttoString();
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Example: A Data Holder for a Domain Object (Java)
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I use Row Data Gateway mostly with Transaction Script (110) If we want to use the Row Data Gateway from a Domain Model (116), the domain objects need to get at the data from the gateway Instead of copying the
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data to the domain object we can use the Row Data Gateway as a data holder for the domain object
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class Person private PersonGateway data; public Person(PersonGateway data) { thisdata = data; }
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Accessors on the domain logic can then delegate to the gateway for the data
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class Person public int getNumberOfDependents() { return datagetNumberOfDependents(); }
The domain logic uses the getters to pull the data from the gateway
class Person public Money getExemption() { Money baseExemption = Moneydollars(1500); Money dependentExemption = Moneydollars(750); return baseExemptionadd(dependentExemptionmultiply(thisgetNumberOfDependents())); }
Active Record
An object that wraps a row in a database table or view, encapsulates the database access, and adds domain logic on that data
An object carries both data and behavior Much of this data is persistent and needs to be stored in a database Active Record uses the most obvious approach, putting data access logic in the domain object This way all people know how to read and write their data to and from the database