com.mckoi.database.interpret

Class CreateTable

java.lang.Object

com.mckoi.database.interpret.Statement

com.mckoi.database.interpret.CreateTable

public class CreateTable
extends Statement

A parsed state container for the 'create' statement.

Author:

Tobias Downer

Field Summary

Fields inherited from class com.mckoi.database.interpret.Statement

cmd, database, query, table_list, user

Constructor Summary

Constructors

Constructor and Description
CreateTable()

Method Summary

Modifier and Type	Method and Description
Table	evaluate() Evaluates the statement and returns a table that represents the result set.
void	prepare() Prepares the statement with the given Database object.

Methods inherited from class com.mckoi.database.interpret.Statement

addTable, Debug, init, resolveTree, resolveVariableName

Methods inherited from class java.lang.Object

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

Constructor Detail

CreateTable

public CreateTable()

Method Detail

prepare

public void prepare()
             throws DatabaseException

Description copied from class: Statement

Prepares the statement with the given Database object. This is called before the statement is evaluated. The prepare statement queries the database and resolves information about the statement (for example, it resolves column names and aliases and determines the tables that are touched by this statement so we can lock the appropriate tables before we evaluate).

NOTE: Care must be taken to ensure that all methods called here are safe in as far as modifications to the data occuring. The rules for safety should be as follows. If the database is in EXCLUSIVE mode, then we need to wait until it's switched back to SHARED mode before this method is called. All collection of information done here should not involve any table state info. except for column count, column names, column types, etc. Queries such as obtaining the row count, selectable scheme information, and certainly 'getCellContents' must never be called during prepare. When prepare finishes, the affected tables are locked and the query is safe to 'evaluate' at which time table state is safe to inspect.

Specified by:

prepare in class Statement

Throws:

DatabaseException

evaluate

public Table evaluate()
               throws DatabaseException

Description copied from class: Statement

Evaluates the statement and returns a table that represents the result set. This is called after 'prepare'.

Specified by:

evaluate in class Statement

Throws:

DatabaseException