query
Class QueryCheck

java.lang.Object
  query.QueryCheck

 class QueryCheck
extends java.lang.Object

Uses the catalogs to perform final type checking for query statements.

Constructor Summary

private

QueryCheck() Private constructor (static class).

Method Summary

static int	columnExists(Schema schema, java.lang.String columnName) Checks whether a column exists.
static void	fileNotExists(java.lang.String fileName) Checks whether a file name does not exist.
static void	indexExists(java.lang.String indexName) Checks whether an index exists.
static void	insertValues(Schema schema, java.lang.Object[] values) Checks whether values to insert matches the table schema.
static void	predicates(Schema schema, Predicate[][] preds) Checks whether selection predicates (in CNF) match the given schema.
static Schema	tableExists(java.lang.String tableName) Checks whether a table exists.
static int[]	updateFields(Schema schema, java.lang.String[] fields) Checks whether field to update match the table schema.
static void	updateValues(Schema schema, int[] fldnos, java.lang.Object[] values) Checks whether values to update matches the table schema.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

QueryCheck

private QueryCheck()

Private constructor (static class).

Method Detail

fileNotExists

public static void fileNotExists(java.lang.String fileName)
                          throws QueryException

Checks whether a file name does not exist.

Throws:

QueryException

tableExists

public static Schema tableExists(java.lang.String tableName)
                          throws QueryException

Checks whether a table exists.

Returns:

schema of the table

Throws:

QueryException

indexExists

public static void indexExists(java.lang.String indexName)
                        throws QueryException

Checks whether an index exists.

Throws:

QueryException

columnExists

public static int columnExists(Schema schema,
                               java.lang.String columnName)
                        throws QueryException

Checks whether a column exists.

Returns:

field number of the column

Throws:

QueryException

insertValues

public static void insertValues(Schema schema,
                                java.lang.Object[] values)
                         throws QueryException

Checks whether values to insert matches the table schema.

Throws:

QueryException - if wrong number of columns or invalid values

updateFields

public static int[] updateFields(Schema schema,
                                 java.lang.String[] fields)
                          throws QueryException

Checks whether field to update match the table schema.

Returns:

the field numbers of the columns to update.

Throws:

QueryException - if a column name doesn't exist

updateValues

public static void updateValues(Schema schema,
                                int[] fldnos,
                                java.lang.Object[] values)
                         throws QueryException

Checks whether values to update matches the table schema.

Throws:

QueryException - if wrong number of columns or invalid values

predicates

public static void predicates(Schema schema,
                              Predicate[][] preds)
                       throws QueryException

Checks whether selection predicates (in CNF) match the given schema.

Throws:

QueryException - if any predicates are invalid