gudusoft.gsqlparser.resolver2.context

Class DatabaseContextTracker

Object

gudusoft.gsqlparser.resolver2.context.DatabaseContextTracker

public class DatabaseContextTracker
extends Object

Delta 4: Database context tracker for USE/SET statements. Tracks USE DATABASE, USE SCHEMA, SET SCHEMA, and similar statements to maintain the current database/schema context during resolution. This enables proper resolution of unqualified table names when the context is set by prior statements in the same SQL batch. Example:

 USE mydb;
 SELECT * FROM t;  -- 't' should resolve to 'mydb.dbo.t' (or 'mydb.t')
 

Constructor Summary

Constructors

Constructor and Description
DatabaseContextTracker()

Method Summary

Modifier and Type	Method and Description
void	applyDefaults(TSQLEnv env) Apply the tracked defaults to a TSQLEnv.
String	getCurrentDatabase() Get the current database name.
String	getCurrentSchema() Get the current schema name.
boolean	hasContext() Check if any context has been tracked.
void	processStatement(TCustomSqlStatement stmt) Process a single statement and update context if it's a USE/SET statement.
void	processStatements(TStatementList statements) Process all statements in the list to extract database/schema context.
void	reset() Reset the context tracker.
String	toString()

Methods inherited from class Object

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

Constructor Detail

DatabaseContextTracker

public DatabaseContextTracker()

Method Detail

processStatements

public void processStatements(TStatementList statements)

Process all statements in the list to extract database/schema context.

Parameters:

statements - The list of SQL statements to process

processStatement

public void processStatement(TCustomSqlStatement stmt)

Process a single statement and update context if it's a USE/SET statement.

Parameters:

stmt - The statement to process

applyDefaults

public void applyDefaults(TSQLEnv env)

Apply the tracked defaults to a TSQLEnv.

Parameters:

env - The SQL environment to update

hasContext

public boolean hasContext()

Check if any context has been tracked.

Returns:

true if either database or schema context has been set

getCurrentDatabase

public String getCurrentDatabase()

Get the current database name.

Returns:

The current database name, or null if not set

getCurrentSchema

public String getCurrentSchema()

Get the current schema name.

Returns:

The current schema name, or null if not set

reset

public void reset()

Reset the context tracker.

toString

public String toString()

Overrides:

toString in class Object