Package gudusoft.gsqlparser.resolver

Class TRelationResolver

Object

gudusoft.gsqlparser.nodes.TParseTreeVisitor

gudusoft.gsqlparser.resolver.TRelationResolver

public class TRelationResolver
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	Description
TRelationResolver(TStatementList sqls, gudusoft.gsqlparser.compiler.TContext scope, TSQLResolver resolver)	创建关系解析器实例。

Method Summary

Modifier and Type	Method	Description
void	postVisit(TCTE cte)
void	postVisit(TJoinExpr joinExpr)
void	postVisit(TMergeInsertClause node)
void	postVisit(TTable table)
void	postVisit(TCreateTableSqlStatement stmt)
void	postVisit(TMergeSqlStatement stmt)
void	postVisit(TSelectSqlStatement stmt)
void	preVisit(TCTE cte)
void	preVisit(TJoinExpr joinExpr)
void	preVisit(TMergeInsertClause node)
void	preVisit(TPivotClause pivotClause)
void	preVisit(TTable node)	处理表节点，根据表类型收集相应的属性。 这是属性收集的核心方法。
void	preVisit(TTableFunction node)	处理struct_t类型的表函数。 初始化函数返回的属性列表。
void	preVisit(TCreateTableSqlStatement stmt)
void	preVisit(TMergeSqlStatement stmt)
void	preVisit(TSelectSqlStatement stmt)
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 java.lang.Object

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

Constructor Details

TRelationResolver

public TRelationResolver(TStatementList sqls,
 gudusoft.gsqlparser.compiler.TContext scope,
 TSQLResolver resolver)

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 Details

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。

preVisit

public void preVisit(TTableFunction node)

处理struct_t类型的表函数。 初始化函数返回的属性列表。

Overrides:

preVisit in class TParseTreeVisitor

preVisit

public void preVisit(TTable node)

处理表节点，根据表类型收集相应的属性。 这是属性收集的核心方法。

Overrides:

preVisit in class TParseTreeVisitor

postVisit

public void postVisit(TTable table)

Overrides:

postVisit in class TParseTreeVisitor

preVisit

public void preVisit(TJoinExpr joinExpr)

Overrides:

preVisit in class TParseTreeVisitor

preVisit

public void preVisit(TPivotClause pivotClause)

Overrides:

preVisit in class TParseTreeVisitor

preVisit

public void preVisit(TMergeInsertClause node)

Overrides:

preVisit in class TParseTreeVisitor

postVisit

public void postVisit(TMergeInsertClause node)

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

postVisit

public void postVisit(TJoinExpr joinExpr)

Overrides:

postVisit in class TParseTreeVisitor

preVisit

public void preVisit(TSelectSqlStatement stmt)

Overrides:

preVisit in class TParseTreeVisitor

postVisit

public void postVisit(TSelectSqlStatement stmt)

Overrides:

postVisit in class TParseTreeVisitor

preVisit

public void preVisit(TMergeSqlStatement stmt)

Overrides:

preVisit in class TParseTreeVisitor

postVisit

public void postVisit(TMergeSqlStatement stmt)

Overrides:

postVisit in class TParseTreeVisitor

preVisit

public void preVisit(TCreateTableSqlStatement stmt)

Overrides:

preVisit in class TParseTreeVisitor

postVisit

public void postVisit(TCreateTableSqlStatement stmt)

Overrides:

postVisit in class TParseTreeVisitor