TRelationResolver (General SQL Parser Java Library Core 4.1.0.5 API)

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

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`postVisit(TCreateTableSqlStatement stmt)`
`void`	`postVisit(TCTE cte)`
`void`	`postVisit(TJoinExpr joinExpr)`
`void`	`postVisit(TMergeInsertClause node)`
`void`	`postVisit(TMergeSqlStatement stmt)`
`void`	`postVisit(TSelectSqlStatement stmt)`
`void`	`postVisit(TTable table)`
`void`	`preVisit(TCreateTableSqlStatement stmt)`
`void`	`preVisit(TCTE cte)`
`void`	`preVisit(TJoinExpr joinExpr)`
`void`	`preVisit(TMergeInsertClause node)`
`void`	`preVisit(TMergeSqlStatement stmt)`
`void`	`preVisit(TPivotClause pivotClause)`
`void`	`preVisit(TSelectSqlStatement stmt)`
`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`	`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
  - 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 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。
  - 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

Class TRelationResolver

Constructor Summary

Method Summary

Methods inherited from class gudusoft.gsqlparser.nodes.TParseTreeVisitor

Methods inherited from class Object

Constructor Detail

TRelationResolver

Method Detail

resolve

preVisit

preVisit

postVisit

preVisit

preVisit

preVisit

postVisit

preVisit

postVisit

postVisit

preVisit

postVisit

preVisit

postVisit

preVisit

postVisit