Class: Rubyfb::Statement

Inherits:
Object
  • Object
show all
Defined in:
lib/src.rb,
lib/statement.rb

Overview

This class represents a prepared SQL statement that may be executed more than once.

Defined Under Namespace

Classes: ColumnMetadata

Constant Summary collapse

SELECT_STATEMENT =

A definition for a SQL statement type constant.

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INSERT_STATEMENT =

A definition for a SQL statement type constant.

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UPDATE_STATEMENT =

A definition for a SQL statement type constant.

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DELETE_STATEMENT =

A definition for a SQL statement type constant.

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DDL_STATEMENT =

A definition for a SQL statement type constant.

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GET_SEGMENT_STATEMENT =

A definition for a SQL statement type constant.

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PUT_SEGMENT_STATEMENT =

A definition for a SQL statement type constant.

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EXECUTE_PROCEDURE_STATEMENT =

A definition for a SQL statement type constant.

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START_TRANSACTION_STATEMENT =

A definition for a SQL statement type constant.

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COMMIT_STATEMENT =

A definition for a SQL statement type constant.

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ROLLBACK_STATEMENT =

A definition for a SQL statement type constant.

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SELECT_FOR_UPDATE_STATEMENT =

A definition for a SQL statement type constant.

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SET_GENERATOR_STATEMENT =

A definition for a SQL statement type constant.

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SAVE_POINT_STATEMENT =

A definition for a SQL statement type constant.

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Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(connection, sql) ⇒ Statement

This is the constructor for the Statement class.

Parameters

connection

The Connection object that the SQL statement will be executed through.

sql

The SQL statement to be prepared for execution.


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# File 'lib/src.rb', line 581

def initialize(connection, sql)
end

Instance Attribute Details

#metadataObject (readonly)

Returns the value of attribute metadata


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# File 'lib/statement.rb', line 3

def 
  @metadata
end

Instance Method Details

#closeObject

This method releases the database resources associated with a Statement object and should be explicitly called when a Statement object is of no further use.

Exceptions

FireRubyError

Generated whenever a problem occurs closing the statement object.


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# File 'lib/src.rb', line 713

def close
end

#connectionObject

This is the accessor for the connection attribute.


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# File 'lib/src.rb', line 588

def connection
end

#create_column_metadataObject


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# File 'lib/statement.rb', line 9

def 
  ColumnMetadata.new
end

#create_result_set(transaction) ⇒ Object


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# File 'lib/statement.rb', line 13

def create_result_set(transaction)
  ResultSet.new(self, transaction)
end

#dialectObject

This is the accessor for the dialect attribute.


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# File 'lib/src.rb', line 602

def dialect
end

#exec(parameters = nil, transaction = nil) {|row| ... } ⇒ Object

This method executes the SQL statement within a Statement object optionaly passing it a set of parameters. Parameterized statements use question marks as place holders for values that may change between calls to execute the statement. This method returns a ResultSet object if the statement executed was a SQL query. If the statement was a non-query SQL statement (insert, update or delete) then the method returns a count of the number of rows affected. For all other types of statement the method returns nil. This method accepts a block taking a single parameter. If this block is provided and the statement is a query then the rows returned by the query will be passed, one at a time, to the block.

Parameters

parameters

An array of the parameters (optional) for the statement. An effort will be made to convert the values passed in to the appropriate types but no guarantees are made (especially in the case of text fields, which will simply use to_s if the object passed is not a String).

transaction

A reference to the transaction object (optional). If this parameter is nil - the statement is execute within its own (implicit) transaction. For statements that return result set objects - the implicit transaction is resolved when the result set object is closed, for the other kind of statements the implicit transaction is resolved immediately after the execution

Exception

Exception

Generated whenever a problem occurs translating one of the input parameters or executing the SQL statement.

Yields:

  • (row)

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# File 'lib/src.rb', line 673

def exec(parameters=nil, transaction=nil)
   yield row
end

#exec_and_close(parameters = nil, transaction = nil) {|row| ... } ⇒ Object

This method behaves exactly as the exec() method, except that the statement is also closed. If no result set is generated the statement is closed immediately, otherwise the statement close() call thakes place when the resul tset close() is called.

Parameters

parameters

An array of the parameters (optional) for the statement. An effort will be made to convert the values passed in to the appropriate types but no guarantees are made (especially in the case of text fields, which will simply use to_s if the object passed is not a String).

transaction

A reference to the transaction object (optional). If this parameter is nil - the statement is execute within its own (implicit) transaction. For statements that return result set objects - the implicit transaction is resolved when the result set object is closed, for the other kind of statements the implicit transaction is resolved immediately after the execution

Exception

Exception

Generated whenever a problem occurs translating one of the input parameters or executing the SQL statement.

Yields:

  • (row)

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# File 'lib/src.rb', line 700

def exec_and_close(parameters=nil, transaction=nil)
   yield row
end

#parameter_countObject

This method fetches a count of the number of dynamic parameters for a statement object (i.e. the number of parameters that must be provided with values before the SQL statement can be executed).


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# File 'lib/src.rb', line 619

def parameter_count
end

#planObject

This method returns the SQL execution plan for the statement

Exceptions

FireRubyError

Generated whenever a problem occurs obtaining the plan


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# File 'lib/src.rb', line 722

def plan
end

#prepare(transaction = nil) ⇒ Object

This method prepares the SQL statement

Parameters

transaction

A reference to the transaction object (optional). If this parameter is nil - the statement is prepared within its own (implicit) transaction.

Exception

Exception

Generated whenever a problem occurspreparing the SQL statement.


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# File 'lib/src.rb', line 640

def prepare(transaction=nil)
end

#prepared?Boolean

This method is used to determine whether a Statement object is prepared

Returns:

  • (Boolean)

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# File 'lib/src.rb', line 626

def prepared?
end

#sqlObject

This is the accessor for the SQL statement attribute.


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# File 'lib/src.rb', line 595

def sql
end

#typeObject

This method is used to determine the type of a SQL statement. The method will return one of the constant SQL types defined within the class.


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# File 'lib/src.rb', line 610

def type
end