gudusoft.gsqlparser.resolver

Class TMetadataCollector

Object

gudusoft.gsqlparser.nodes.TParseTreeVisitor

gudusoft.gsqlparser.resolver.TMetadataCollector

public class TMetadataCollector
extends TParseTreeVisitor

TMetadataCollector is responsible for collecting metadata information from SQL statements, particularly focusing on table and function definitions. It traverses the parse tree and builds up metadata in the global scope.

Constructor Summary

Constructors

Constructor and Description
TMetadataCollector(TStatementList sqls, gudusoft.gsqlparser.compiler.TContext context) Constructor for TMetadataCollector.

Method Summary

Modifier and Type	Method and Description
static TSQLTable	addDeclaredTable(TCreateTableSqlStatement stmt, TSQLEnv env) The catalog half of registerDeclaredTable(gudusoft.gsqlparser.stmt.TCreateTableSqlStatement, gudusoft.gsqlparser.sqlenv.TSQLEnv): put the declared table in env and return it, leaving the statement as it is.
static TSQLTable	addDeclaredTable(TCreateTableSqlStatement stmt, TSQLEnv env, String defaultCatalog, String defaultSchema) addDeclaredTable(TCreateTableSqlStatement, TSQLEnv) in an explicit database and schema.
void	collect() Main method to start metadata collection process.
static TSQLSchema	declaredTableOwner(TObjectName name, EDbVendor vendor, TSQLEnv env, String defaultCatalog, String defaultSchema) The schema a table named name is declared in: its own qualification, else defaultCatalog and defaultSchema, else DEFAULT (dbo for SQL Server).
static TSQLTable	findDeclaredTable(TCreateTableSqlStatement stmt, TSQLEnv env, String defaultCatalog, String defaultSchema) The table env already holds where a declaration of stmt's table would go if env's current database and schema were defaultCatalog and defaultSchema, or null.
void	preVisit(TCreateFunctionStmt stmt) Processes CREATE FUNCTION statements to collect function metadata.
void	preVisit(TCreateTableSqlStatement stmt)
static TSQLTable	registerDeclaredTable(TCreateTableSqlStatement stmt, TSQLEnv env) Register only a schema declared by this CREATE, never an unknown LIKE/CLONE shape.
static TSQLTable	registerDeclaredTable(TCreateTableSqlStatement stmt, TSQLEnv env, String defaultCatalog, String defaultSchema) registerDeclaredTable(TCreateTableSqlStatement, TSQLEnv) as if env's current database and schema were defaultCatalog and defaultSchema, without changing them.
static boolean	replacesTable(TCreateTableSqlStatement stmt) CREATE OR REPLACE without IF NOT EXISTS: the declaration takes the place of a table of that name.

Methods inherited from class gudusoft.gsqlparser.nodes.TParseTreeVisitor

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preVisit, preVisit, preVisit

Methods inherited from class Object

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

Constructor Detail

TMetadataCollector

public TMetadataCollector(TStatementList sqls,
                          gudusoft.gsqlparser.compiler.TContext context)

Constructor for TMetadataCollector. Initializes the collector with a list of SQL statements and a global context.

Parameters:

sqls - List of SQL statements to analyze

context - Global context that will store collected metadata

Method Detail

collect

public void collect()

Main method to start metadata collection process. Iterates through all SQL statements and collects metadata from each one. This includes: - Table definitions from CREATE TABLE statements - Function definitions from CREATE FUNCTION statements - Other metadata from various SQL statements

registerDeclaredTable

public static TSQLTable registerDeclaredTable(TCreateTableSqlStatement stmt,
                                              TSQLEnv env)

Register only a schema declared by this CREATE, never an unknown LIKE/CLONE shape.

registerDeclaredTable

public static TSQLTable registerDeclaredTable(TCreateTableSqlStatement stmt,
                                              TSQLEnv env,
                                              String defaultCatalog,
                                              String defaultSchema)

registerDeclaredTable(TCreateTableSqlStatement, TSQLEnv) as if env's current database and schema were defaultCatalog and defaultSchema, without changing them.

addDeclaredTable

public static TSQLTable addDeclaredTable(TCreateTableSqlStatement stmt,
                                         TSQLEnv env)

The catalog half of registerDeclaredTable(gudusoft.gsqlparser.stmt.TCreateTableSqlStatement, gudusoft.gsqlparser.sqlenv.TSQLEnv): put the declared table in env and return it, leaving the statement as it is. A table env already holds there is kept, unless the statement replaces it.

addDeclaredTable

public static TSQLTable addDeclaredTable(TCreateTableSqlStatement stmt,
                                         TSQLEnv env,
                                         String defaultCatalog,
                                         String defaultSchema)

addDeclaredTable(TCreateTableSqlStatement, TSQLEnv) in an explicit database and schema.

declaredTableOwner

public static TSQLSchema declaredTableOwner(TObjectName name,
                                            EDbVendor vendor,
                                            TSQLEnv env,
                                            String defaultCatalog,
                                            String defaultSchema)

The schema a table named name is declared in: its own qualification, else defaultCatalog and defaultSchema, else DEFAULT (dbo for SQL Server). Creates the catalog and schema when missing.

findDeclaredTable

public static TSQLTable findDeclaredTable(TCreateTableSqlStatement stmt,
                                          TSQLEnv env,
                                          String defaultCatalog,
                                          String defaultSchema)

The table env already holds where a declaration of stmt's table would go if env's current database and schema were defaultCatalog and defaultSchema, or null. Creates no catalog or schema.

replacesTable

public static boolean replacesTable(TCreateTableSqlStatement stmt)

CREATE OR REPLACE without IF NOT EXISTS: the declaration takes the place of a table of that name.

preVisit

public void preVisit(TCreateTableSqlStatement stmt)

Overrides:

preVisit in class TParseTreeVisitor

preVisit

public void preVisit(TCreateFunctionStmt stmt)

Processes CREATE FUNCTION statements to collect function metadata. Captures function name, parameters, and return type information.

Overrides:

preVisit in class TParseTreeVisitor

Parameters:

stmt - The CREATE FUNCTION statement to process Actions performed: 1. Creates new function entry in SQL environment 2. Processes function parameters 3. Sets function return type