gudusoft.gsqlparser.resolver

Class TAttributeResolver

Object

gudusoft.gsqlparser.nodes.TParseTreeVisitor

gudusoft.gsqlparser.resolver.TAttributeResolver

public class TAttributeResolver
extends TParseTreeVisitor

TAttributeResolver 的核心职责是为SQL语句中出现的每一个列找到其所属的表。 工作原理： 1. 遍历SQL语句中的所有列引用（TObjectName） 2. 对每个列，在其可见范围内搜索可能的源表 3. 建立列和表之间的对应关系 列查找规则： 1. 无表限定列(column)： - 在当前SELECT的FROM子句中所有表中查找 - 如果多个表都有这个列，标记为不明确 2. 带表限定列(table.column)： - 在FROM子句中查找指定的表 - 检查该表是否包含指定的列 3. 子查询中的列： - 先在子查询的FROM子句中查找 - 如果未找到，根据子查询类型决定是否查找外层查询 查找结果存储： - 在TObjectName.sourceTable中存储找到的表 - 在TObjectName.candidateTables中存储所有可能的表

Constructor Summary

Constructors

Constructor and Description
TAttributeResolver(TStatementList sqls, gudusoft.gsqlparser.compiler.TContext scope, TSQLResolver resolver)

Method Summary

Modifier and Type	Method and Description
void	postVisit(TCreateTableSqlStatement stmt)
void	postVisit(TDeleteSqlStatement stmt)
void	postVisit(TInsertSqlStatement stmt)
void	postVisit(TJoinExpr node)
void	postVisit(TMergeInsertClause node)
void	postVisit(TMergeSqlStatement stmt)
void	postVisit(TPivotClause node)
void	postVisit(TPivotedTable node)
void	postVisit(TPlsqlCreateFunction stmt)
void	postVisit(TPlsqlCreatePackage stmt)
void	postVisit(TPlsqlCreateProcedure stmt)
void	postVisit(TSelectSqlStatement stmt)
void	postVisit(TTable node)
void	postVisit(TUpdateSqlStatement stmt)
void	preVisit(TCreateTableSqlStatement stmt)
void	preVisit(TDeleteSqlStatement stmt)
void	preVisit(TFunctionCall functionCall)
void	preVisit(TInsertSqlStatement stmt)
void	preVisit(TJoinExpr node)
void	preVisit(TMergeInsertClause node)
void	preVisit(TMergeSqlStatement stmt)
void	preVisit(TObjectName attribute)
void	preVisit(TPivotClause node)
void	preVisit(TPivotedTable node)
void	preVisit(TPlsqlCreateFunction stmt)
void	preVisit(TPlsqlCreatePackage stmt)
void	preVisit(TPlsqlCreateProcedure stmt)
void	preVisit(TSelectSqlStatement stmt)
void	preVisit(TUpdateSqlStatement stmt)
void	resolve()
void	resolveInThoseRelations(TObjectName attribute, ArrayList<TTable> relations)

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

TAttributeResolver

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

Method Detail

resolve

public void resolve()

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(TDeleteSqlStatement stmt)

Overrides:

preVisit in class TParseTreeVisitor

postVisit

public void postVisit(TDeleteSqlStatement stmt)

Overrides:

postVisit in class TParseTreeVisitor

preVisit

public void preVisit(TUpdateSqlStatement stmt)

Overrides:

preVisit in class TParseTreeVisitor

postVisit

public void postVisit(TUpdateSqlStatement stmt)

Overrides:

postVisit in class TParseTreeVisitor

preVisit

public void preVisit(TInsertSqlStatement stmt)

Overrides:

preVisit in class TParseTreeVisitor

postVisit

public void postVisit(TInsertSqlStatement 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

preVisit

public void preVisit(TPivotedTable node)

Overrides:

preVisit in class TParseTreeVisitor

postVisit

public void postVisit(TPivotedTable node)

Overrides:

postVisit in class TParseTreeVisitor

preVisit

public void preVisit(TJoinExpr node)

Overrides:

preVisit in class TParseTreeVisitor

postVisit

public void postVisit(TJoinExpr node)

Overrides:

postVisit in class TParseTreeVisitor

preVisit

public void preVisit(TPivotClause node)

Overrides:

preVisit in class TParseTreeVisitor

postVisit

public void postVisit(TPivotClause node)

Overrides:

postVisit 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(TObjectName attribute)

Overrides:

preVisit in class TParseTreeVisitor

resolveInThoseRelations

public void resolveInThoseRelations(TObjectName attribute,
                                    ArrayList<TTable> relations)

postVisit

public void postVisit(TTable node)

Overrides:

postVisit in class TParseTreeVisitor

preVisit

public void preVisit(TFunctionCall functionCall)

Overrides:

preVisit in class TParseTreeVisitor

preVisit

public void preVisit(TPlsqlCreatePackage stmt)

Overrides:

preVisit in class TParseTreeVisitor

postVisit

public void postVisit(TPlsqlCreatePackage stmt)

Overrides:

postVisit in class TParseTreeVisitor

preVisit

public void preVisit(TPlsqlCreateProcedure stmt)

Overrides:

preVisit in class TParseTreeVisitor

postVisit

public void postVisit(TPlsqlCreateProcedure stmt)

Overrides:

postVisit in class TParseTreeVisitor

preVisit

public void preVisit(TPlsqlCreateFunction stmt)

Overrides:

preVisit in class TParseTreeVisitor

postVisit

public void postVisit(TPlsqlCreateFunction stmt)

Overrides:

postVisit in class TParseTreeVisitor