Class: IBRuby::ResultSet
Overview
This class represents the results of a SQL query executed against a database. The viable lifespan of a ResultSet object is limited by the transaction that was used in it’s creation. Once this transaction has been committed or rolled back all related ResultSet object are invalidated and can no longer be used.
Instance Method Summary collapse
-
#close ⇒ Object
This method releases the database resources associated with a ResultSet object and should be explicitly called when a ResultSet object is of no further use.
-
#column_alias(column) ⇒ Object
This method fetches the alias associated with a specified column for a ResultSet object.
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#column_count ⇒ Object
This method fetches a count of the number of columns in a row of data that the ResultSet can fetch.
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#column_name(column) ⇒ Object
This method fetches the name associated with a specified column for a ResultSet object.
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#column_table(column) ⇒ Object
This method fetches the table name associated with a specified column for a ResultSet object.
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#connection ⇒ Object
This is the accessor for the connection attribute.
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#dialect ⇒ Object
This is the accessor for the dialect attribute.
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#each(&block) ⇒ Object
This method provides an iterator for the (remaining) rows contained in a ResultSet object.
-
#exhausted? ⇒ Boolean
This method is used to determine if all of the rows have been retrieved from a ResultSet object.
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#fetch ⇒ Object
This method fetches a single rows worth of data from the ResultSet object.
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#get_base_type(index) ⇒ Object
This method retrieves the base SQL type for a column of data within a ResultSet object.
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#initialize(connection, transaction, sql, dialect) ⇒ ResultSet
constructor
This is the constructor for the ResultSet object.
-
#row_count ⇒ Object
This method fetches a count of the total number of rows retrieved from a result set.
-
#sql ⇒ Object
This is the accessor for the sql attribute.
-
#transaction ⇒ Object
This is the accessor for the transaction attribute.
Constructor Details
#initialize(connection, transaction, sql, dialect) ⇒ ResultSet
This is the constructor for the ResultSet object.
Parameters
- connection
-
A reference to the Connection object that will be used to execute the SQL query.
- transaction
-
A reference to the Transaction object that will be used in executing the SQL query.
- sql
-
A reference to a String containing the SQL query that will be executed.
- dialect
-
A reference to an integer containing the InterBase dialect to be used in executing the SQL statement.
Exceptions
- IBRubyException
-
Generated whenever a non-query SQL statement is
specified, an invalid connection or transaction is provided or a problem occurs executing the SQL against the database.
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# File 'lib/src.rb', line 706 def initialize(connection, transaction, sql, dialect) end |
Instance Method Details
#close ⇒ Object
This method releases the database resources associated with a ResultSet object and should be explicitly called when a ResultSet object is of no further use. The method is implicitly called if the rows available from a ResultSet are exhausted but calling this method at that time will not cause an error.
Exceptions
- IBRubyError
-
Generated whenever a problem occurs closing the result
set object.
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# File 'lib/src.rb', line 836 def close end |
#column_alias(column) ⇒ Object
This method fetches the alias associated with a specified column for a ResultSet object.
Parameters
- column
-
A reference to the column number to fetch the details for. Column numbers start at zero.
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# File 'lib/src.rb', line 766 def column_alias(column) end |
#column_count ⇒ Object
This method fetches a count of the number of columns in a row of data that the ResultSet can fetch.
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# File 'lib/src.rb', line 742 def column_count end |
#column_name(column) ⇒ Object
This method fetches the name associated with a specified column for a ResultSet object.
Parameters
- column
-
A reference to the column number to fetch the details for. Column numbers start at zero.
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# File 'lib/src.rb', line 754 def column_name(column) end |
#column_table(column) ⇒ Object
This method fetches the table name associated with a specified column for a ResultSet object.
Parameters
- column
-
A reference to the column number to fetch the details for. Column numbers start at zero.
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# File 'lib/src.rb', line 778 def column_table(column) end |
#connection ⇒ Object
This is the accessor for the connection attribute.
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# File 'lib/src.rb', line 713 def connection end |
#dialect ⇒ Object
This is the accessor for the dialect attribute.
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# File 'lib/src.rb', line 734 def dialect end |
#each(&block) ⇒ Object
This method provides an iterator for the (remaining) rows contained in a ResultSet object.
Parameters
- block
-
A block that takes a single parameter. This will be called for and passed each remaining row (as per the fetch method) from the ResultSet.
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# File 'lib/src.rb', line 821 def each(&block) end |
#exhausted? ⇒ Boolean
This method is used to determine if all of the rows have been retrieved from a ResultSet object. This method will always return false until the fetch method has been called at least once so it cannot be used to detect a result set that returns no rows.
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# File 'lib/src.rb', line 800 def exhausted? end |
#fetch ⇒ Object
This method fetches a single rows worth of data from the ResultSet object. If the set contains more rows then an array containing the row data will be retrieved. If the ResultSet is exhausted (i.e. all rows have been fetched) then nil is returned. Translation of the row data into an appropriate Ruby type is performed on the row data that is extracted.
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# File 'lib/src.rb', line 790 def fetch end |
#get_base_type(index) ⇒ Object
This method retrieves the base SQL type for a column of data within a ResultSet object. The method returns one of the base types defined in the SQLType class but does not return an actual SQLType object.
Parameters
- index
-
The offset from the ResultSet first column of the column to return the type information for.
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# File 'lib/src.rb', line 848 def get_base_type(index) end |
#row_count ⇒ Object
This method fetches a count of the total number of rows retrieved from a result set.
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# File 'lib/src.rb', line 808 def row_count end |
#sql ⇒ Object
This is the accessor for the sql attribute.
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# File 'lib/src.rb', line 727 def sql end |
#transaction ⇒ Object
This is the accessor for the transaction attribute.
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# File 'lib/src.rb', line 720 def transaction end |