import?java.util.*;
import?java.io.*;
import?antlr.CommonAST;
import?antlr.collections.AST;

class?exmain?{
????public?static?void?main（String[]?args）?{
????????try?{
????????????//詞法分析器接受來自用戶的輸入
RelationToSQLLexer?lexer?=
????????????????new?RelationToSQLLexer（new?DataInputStream（System.in））;
????????????//詞法分析器處理的結果傳遞給語法分析器
????????????RelationToSQLParser?parser?=?new?RelationToSQLParser（lexer）;
????????????//解析輸入的關系代數表達式
????????????parser.expr（）;
???????????//得到定義的語法樹結構
????????????CommonAST?t?=?（CommonAST）parser.getAST（）;
???????????//定義樹的遍歷對象
????????????RelationToSQLTreeWalker?walker?=?new?RelationToSQLTreeWalker（）;
????????????//?對樹進行遍歷以生成SQL語句
????????????walker.expr（t）;
????????????System.out.println（）;
???????}?catch（Exception?e）?{
????????????System.err.println（“exception：?“+e）;
????????}
????}
}

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????目錄??????????0??2011-06-23?15:35??2

?????文件????????476??2011-06-23?15:04??2\2.jcp

?????文件??????14158??2011-06-22?09:54??2\RelationToSQLLexer.java

?????文件????????472??2011-06-22?09:54??2\RelationToSQLParserTokenTypes.java

?????文件????????279??2011-06-22?09:54??2\RelationToSQLParserTokenTypes.txt

?????文件??????18156??2011-06-22?09:54??2\RelationToSQLTreeWalker.java

?????文件????????154??2011-06-23?15:18??2\src_2.txt

?????文件????????732??2011-06-23?15:18??2\RelationToSQLParserTokenTypes.class

?????文件??????23186??2011-06-23?15:10??2\RelationToSQLParser.java

?????文件??????12369??2011-06-23?15:18??2\RelationToSQLParser.class

?????文件???????7608??2011-06-23?15:18??2\RelationToSQLLexer.class

?????文件???????1149??2011-06-23?15:18??2\exmain.class

?????文件???????9090??2011-06-23?15:18??2\RelationToSQLTreeWalker.class

?????文件????????921??2011-06-23?15:18??2\main2.java

?????目錄??????????0??2011-06-23?15:35??2\antlr

?????文件????????795??2004-05-10?05:24??2\antlr\ActionElement.java

?????文件????????826??2004-05-10?05:24??2\antlr\ActionTransInfo.java

?????文件???????2121??2004-05-10?05:24??2\antlr\Alternative.java

?????文件???????7617??2004-05-10?05:24??2\antlr\AlternativeBlock.java

?????文件????????972??2004-05-10?05:24??2\antlr\AlternativeElement.java

?????文件??????21312??2004-05-10?05:24??2\antlr\antlr.g

?????文件????????534??2004-05-10?05:24??2\antlr\ANTLRError.java

?????文件????????411??2004-05-10?05:24??2\antlr\ANTLRException.java

?????文件???????3487??2004-05-10?05:24??2\antlr\ANTLRGrammarParseBehavior.java

?????文件???????2849??2004-05-10?05:24??2\antlr\ANTLRHashString.java

?????文件??????37857??2004-05-10?05:25??2\antlr\ANTLRLexer.java

?????文件??????53024??2004-05-10?05:25??2\antlr\ANTLRParser.java

?????文件???????2126??2004-05-10?05:24??2\antlr\ANTLRStringBuffer.java

?????文件??????16004??2004-05-10?05:24??2\antlr\ANTLRTokdefLexer.java

?????文件???????5877??2004-05-10?05:24??2\antlr\ANTLRTokdefParser.java

............此處省略285個文件信息