Which pattern is used in the following code public abstract class DbCommand { public abstract DbDataReader ExecuteReader (); ... // other methods not needed } public abstract class DbDataReader {...} public class SqlCommand extends DbCommand { public override DbDataReader ExecuteReader () { SqlDataReader reader; ... // rest of the code return reader; } } public class SqlDataReader extends DbDataReader {...} public class OracleDbCommand extends DbCommand { public override DbDataReader ExecuteReader () { OracleDbDataReader reader; ... // rest of the code return reader; } } public class OracleDbDataReader extends DbDataReader {...} Select one: a. decorator b. strategy c. observer d. factory method e. abstract factory
Which pattern is used in the following code public abstract class DbCommand { public abstract DbDataReader ExecuteReader (); ... // other methods not needed } public abstract class DbDataReader {...} public class SqlCommand extends DbCommand { public override DbDataReader ExecuteReader () { SqlDataReader reader; ... // rest of the code return reader; } } public class SqlDataReader extends DbDataReader {...} public class OracleDbCommand extends DbCommand { public override DbDataReader ExecuteReader () { OracleDbDataReader reader; ... // rest of the code return reader; } } public class OracleDbDataReader extends DbDataReader {...} Select one: a. decorator b. strategy c. observer d. factory method e. abstract factory
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Which pattern is used in the following code
public abstract class DbCommand
{
public abstract DbDataReader ExecuteReader ();
... // other methods not needed
}
public abstract class DbDataReader {...}
public class SqlCommand extends DbCommand
{
public override DbDataReader ExecuteReader ()
{
SqlDataReader reader;
... // rest of the code
return reader;
}
}
public class SqlDataReader extends DbDataReader {...}
public class OracleDbCommand extends DbCommand
{
public override DbDataReader ExecuteReader ()
{
OracleDbDataReader reader;
... // rest of the code
return reader;
}
}
public class OracleDbDataReader extends DbDataReader {...}
Select one:
a. decorator
b. strategy
c. observer
d. factory method
e. abstract factory
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