scala.dbc

class Database

[source: scala/dbc/Database.scala]

case class Database(val dbms : Vendor)
extends Product
A link to a database. The Database abstract class must be specialised for every different DBMS.
Author
Gilles Dubochet
Method Summary
def close : Unit
..
override def equals (arg0 : Any) : Boolean
This method is used to compare the receiver object (this) with the argument object (arg0) for equivalence.
def executeStatement [ResultType](transactionStatement : Transaction[ResultType]) : Status[ResultType]
Executes a list of statements or other operations inside a transaction. Only statements are protected in a transaction, other Scala code is not.
def executeStatement (relationStatement : Relation) : Relation
Executes a statement that returns a relation on this database.
def executeStatement (statusStatement : Status) : Status[Unit]
Executes a statement that updates the state of the database.
def executeStatement [ResultType](transactionStatement : Transaction[ResultType], debug : Boolean) : Status[ResultType]
Executes a list of statements or other operations inside a transaction. Only statements are protected in a transaction, other Scala code is not.
def executeStatement (relationStatement : Relation, debug : Boolean) : Relation
Executes a statement that returns a relation on this database.
def executeStatement (statusStatement : Status, debug : Boolean) : Status[Unit]
Executes a statement that updates the state of the database.
override def hashCode : Int
Returns a hash code value for the object.
override def productArity : Int
return k for a product A(x_1,...,x_k)
override def productElement (arg0 : Int) : Any
for a product A(x_1,...,x_k), returns x_(n+1) for 0 <= n < k
override def productPrefix : java.lang.String
By default the empty string. Implementations may override this method in order to prepend a string prefix to the result of the toString methods.
override def toString : java.lang.String
Returns a string representation of the object.
Methods inherited from AnyRef
getClass, clone, notify, notifyAll, wait, wait, wait, finalize, ==, !=, eq, ne, synchronized
Methods inherited from Any
==, !=, isInstanceOf, asInstanceOf
Class Summary
class Closed extends java.lang.Exception with AnyRef
Method Details
def close : Unit
..

def executeStatement(relationStatement : Relation) : Relation
Executes a statement that returns a relation on this database.
Parameters
relationStatement - The statement to execute.
Returns
The relation returned by the database for this statement.

def executeStatement(relationStatement : Relation, debug : Boolean) : Relation
Executes a statement that returns a relation on this database.
Parameters
relationStatement - The statement to execute.
debug - Whether debugging information should be printed on the console.
Returns
The relation returned by the database for this statement.

def executeStatement(statusStatement : Status) : Status[Unit]
Executes a statement that updates the state of the database.
Parameters
statusStatement - The statement to execute.
Returns
The status of the database after the statement has been executed.

def executeStatement(statusStatement : Status, debug : Boolean) : Status[Unit]
Executes a statement that updates the state of the database.
Parameters
statusStatement - The statement to execute.
debug - Whether debugging information should be printed on the console.
Returns
The status of the database after the statement has been executed.

def executeStatement[ResultType](transactionStatement : Transaction[ResultType]) : Status[ResultType]
Executes a list of statements or other operations inside a transaction. Only statements are protected in a transaction, other Scala code is not.
Parameters
transactionStatement - The transaction to execute as a closure.
Returns
The status of the database after the transaction has been executed.

def executeStatement[ResultType](transactionStatement : Transaction[ResultType], debug : Boolean) : Status[ResultType]
Executes a list of statements or other operations inside a transaction. Only statements are protected in a transaction, other Scala code is not.
Parameters
transactionStatement - The transaction to execute as a closure.
debug - Whether debugging information should be printed on the console.
Returns
The status of the database after the transaction has been executed.

override def hashCode : Int
Returns a hash code value for the object.

The default hashing algorithm is platform dependent. Note that it is allowed for two objects to have identical hash codes (o1.hashCode.equals(o2.hashCode)) yet not be equal (o1.equals(o2) returns false). A degenerate implementation could always return 0. However, it is required that if two objects are equal (o1.equals(o2) returns true) that they have identical hash codes (o1.hashCode.equals(o2.hashCode)). Therefore, when overriding this method, be sure to verify that the behavior is consistent with the equals method.

Returns
the hash code value for the object.


override def toString : java.lang.String
Returns a string representation of the object.

The default representation is platform dependent.

Returns
a string representation of the object.


override def equals(arg0 : Any) : Boolean
This method is used to compare the receiver object (this) with the argument object (arg0) for equivalence.

The default implementations of this method is an equivalence relation:

  • It is reflexive: for any instance x of type Any, x.equals(x) should return true.
  • It is symmetric: for any instances x and y of type Any, x.equals(y) should return true if and only if y.equals(x) returns true.
  • It is transitive: for any instances x, y, and z of type AnyRef if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.

If you override this method, you should verify that your implementation remains an equivalence relation. Additionally, when overriding this method it is often necessary to override hashCode to ensure that objects that are "equal" (o1.equals(o2) returns true) hash to the same Int (o1.hashCode.equals(o2.hashCode)).

Parameters
arg0 - the object to compare against this object for equality.
Returns
true if the receiver object is equivalent to the argument; false otherwise.


override def productPrefix : java.lang.String
By default the empty string. Implementations may override this method in order to prepend a string prefix to the result of the toString methods.
Overrides
Product.productPrefix

override def productArity : Int
return k for a product A(x_1,...,x_k)
Overrides
Product.productArity

override def productElement(arg0 : Int) : Any
for a product A(x_1,...,x_k), returns x_(n+1) for 0 <= n < k
Parameters
n - the index of the element to return
Throws
IndexOutOfBoundsException -
Returns
The element n elements after the first element
Overrides
Product.productElement