TableDelete Class Reference

Operation to delete data from a table. More...

Methods
TableDelete	delete ()
	Initializes this record deletion handler. More...
TableDelete	where (String expression)
	Sets the search condition to filter the records to be deleted from the Table. More...
TableDelete	orderBy (List sortExprStr)
	Sets the order in which the records will be deleted. More...
TableDelete	limit (Integer numberOfRows)
	Sets the maximum number of rows to be deleted by the operation. More...
TableDelete	bind (String name, Value value)
	Binds a value to a specific placeholder used on this operation. More...
Result	execute ()
	Executes the delete operation with all the configured options. More...

Detailed Description

Operation to delete data from a table.

Handler for Delete operation on Tables.

Member Function Documentation

delete()

TableDelete delete

(

)

Initializes this record deletion handler.

Returns

This TableDelete object.

This function is called automatically when Table.delete() is called.

The actual deletion of the records will occur only when the execute method is called.

Method Chaining

After this function invocation, the following functions can be invoked:

• where(String searchCriteria)
• orderBy(List sortExprStr)
• limit(Integer numberOfRows)
• execute().

See also

Usage examples at execute().

where()

TableDelete where

(

String

expression

)

Sets the search condition to filter the records to be deleted from the Table.

Parameters

expression

Optional condition to filter the records to be deleted.

Returns

This TableDelete object.

If used, only those rows satisfying the expression will be deleted

The expression supports parameter binding.

Method Chaining

This function can be invoked only once after:

• delete()

After this function invocation, the following functions can be invoked:

• orderBy(List sortExprStr)
• limit(Integer numberOfRows)
• bind(String name, Value value)
• execute()

See also

Usage examples at execute().

orderBy()

TableDelete orderBy

(

List

sortExprStr

)

Sets the order in which the records will be deleted.

Returns

This TableDelete object.

If used the records will be deleted in the order established by the sort criteria.

The elements of sortExprStr list are strings defining the column name on which the sorting will be based.

The format is as follows: columnIdentifier [ ASC | DESC ]

If no order criteria is specified, ASC will be used by default.

Method Chaining

This function can be invoked only once after:

• delete()
• where(String searchCondition)

After this function invocation, the following functions can be invoked:

• limit(Integer numberOfRows)
• bind(String name, Value value)
• execute()

limit()

TableDelete limit

(

Integer

numberOfRows

)

Sets the maximum number of rows to be deleted by the operation.

Parameters

numberOfRows

The maximum number of rows to be deleted.

Returns

This TableDelete object.

If used, the operation will delete only numberOfRows rows.

Method Chaining

This function can be invoked only once after:

• delete()
• where(String searchCondition)
• orderBy(List sortExprStr)

This function can be called every time the statement is executed.

After this function invocation, the following functions can be invoked:

• bind(String name, Value value)
• execute()

See also

Usage examples at execute().

bind()

TableDelete bind	(	String	name,
		Value	value
	)

Binds a value to a specific placeholder used on this operation.

Parameters

name	The name of the placeholder to which the value will be bound.
value	The value to be bound on the placeholder.

Returns

This TableDelete object.

Binds a value to a specific placeholder used on this operation.

An error will be raised if the placeholder indicated by name does not exist.

This function must be called once for each used placeholder or an error will be raised when the execute method is called.

Method Chaining

This function can be invoked multiple times right before calling execute:

After this function invocation, the following functions can be invoked:

• bind(String name, Value value)
• execute()

An error will be raised if the placeholder indicated by name does not exist.

This function must be called once for each used placeholder or an error will be raised when the execute method is called.

See also

Usage examples at execute().

execute()

Result execute

(

)

Executes the delete operation with all the configured options.

Returns

A Result object.

Method Chaining

This function can be invoked after any other function on this class.

Examples

//@ TableDelete: delete under condition
var result = table.delete().where('age = 15').execute();
print('Affected Rows:', result.affectedItemsCount, '\n');

var records = table.select().execute().fetchAll();
print('Records Left:', records.length, '\n');

//@ TableDelete: delete with binding
var result = table.delete().where('gender = :heorshe').limit(2).bind('heorshe', 'male').execute();
print('Affected Rows:', result.affectedItemsCount, '\n');

var records = table.select().execute().fetchAll();
print('Records Left:', records.length, '\n');

//@ TableDelete: full delete with a view object
var view = schema.getTable('view1');
var result = view.delete().execute();
print('Affected Rows:', result.affectedItemsCount, '\n');

// Deletion is of course reflected on the target table
var records = table.select().execute().fetchAll();
print('Records Left:', records.length, '\n');

//@ TableDelete: with limit 0
var result = table.insert({ name: 'adam', age: 15, gender: 'male' }).execute();
var result = table.insert({ name: 'brian', age: 14, gender: 'male' }).execute();
var result = table.insert({ name: 'alma', age: 13, gender: 'female' }).execute();
var result = table.insert({ name: 'carol', age: 14, gender: 'female' }).execute();
var result = table.insert({ name: 'donna', age: 16, gender: 'female' }).execute();

var records = table.select().execute().fetchAll();
print('Records Left:', records.length, '\n');

//@ TableDelete: with limit 1
var result = table.delete().limit(2).execute();
print('Affected Rows:', result.affectedItemsCount, '\n');

var records = table.select().execute().fetchAll();
print('Records Left:', records.length, '\n');

//@ TableDelete: with limit 2
var result = table.delete().limit(2).execute();
print('Affected Rows:', result.affectedItemsCount, '\n');

var records = table.select().execute().fetchAll();
print('Records Left:', records.length, '\n');

//@ TableDelete: with limit 3
var result = table.delete().limit(2).execute();
print('Affected Rows:', result.affectedItemsCount, '\n');

var records = table.select().execute().fetchAll();
print('Records Left:', records.length, '\n');