gudusoft.gsqlparser.resolver

Class TRelationResolver2

Object

gudusoft.gsqlparser.nodes.TParseTreeVisitor

gudusoft.gsqlparser.resolver.TRelationResolver2

public class TRelationResolver2
extends TParseTreeVisitor

TRelationResolver 负责为SQL语句中的每个表收集和初始化属性(attributes)。 这些属性主要包含表的列信息，用于后续解析器(如TAttributeResolver)建立表和列之间的关系。 工作流程： 1. 遍历SQL语句中的所有表 2. 根据表的类型(普通表、函数表、子查询等)收集属性 3. 将属性存储在TTable.attributes中 属性来源： - 普通表：从数据库元数据(TSQLTable)获取列信息 - 函数表：从函数定义获取返回列 - 子查询：由TAttributeResolver处理 - XML表：从XML表定义获取列 - 表达式：生成通配符属性

Constructor Summary

Constructors

Constructor and Description
TRelationResolver2(TStatementList sqls, gudusoft.gsqlparser.compiler.TContext scope) 创建关系解析器实例。

Method Summary

Modifier and Type	Method and Description
void	postVisit(TCTE cte)
void	postVisit(TFromClause fromClause)
void	postVisit(TJoinExpr joinExpr)
void	postVisit(TTable table)
void	preVisit(TCTE cte)
void	resolve() 解析所有SQL语句中的表关系。 遍历语句树，为每个表节点收集属性。

Methods inherited from class gudusoft.gsqlparser.nodes.TParseTreeVisitor

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Methods inherited from class Object

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

Constructor Detail

TRelationResolver2

public TRelationResolver2(TStatementList sqls,
                          gudusoft.gsqlparser.compiler.TContext scope)

创建关系解析器实例。

Parameters:

sqls - 要分析的SQL语句列表

scope - 包含SQL环境的全局上下文

Method Detail

resolve

public void resolve()

解析所有SQL语句中的表关系。 遍历语句树，为每个表节点收集属性。

postVisit

public void postVisit(TTable table)

Overrides:

postVisit in class TParseTreeVisitor

postVisit

public void postVisit(TJoinExpr joinExpr)

Overrides:

postVisit in class TParseTreeVisitor

postVisit

public void postVisit(TFromClause fromClause)

Overrides:

postVisit in class TParseTreeVisitor

preVisit

public void preVisit(TCTE cte)

Overrides:

preVisit in class TParseTreeVisitor

postVisit

public void postVisit(TCTE cte)

Overrides:

postVisit in class TParseTreeVisitor