parser支持sql server

git-svn-id: http://code.alibabatech.com/svn/druid/trunk@956 b9813039-fb51-4c41-a8b9-e21c2acb5095

src/main/java/com/alibaba/druid/sql/dialect/oracle/parser/OracleExprParser.java

@@ -66,7 +66,8 @@ public class OracleExprParser extends SQLExprParser {
     }
 
     public OracleExprParser(String text){
-        super(text);
+        super(new OracleLexer(text));
+        this.lexer.nextToken();
     }
 
     public boolean isAggreateFunction(String word) {

src/main/java/com/alibaba/druid/sql/dialect/sqlserver/parser/SqlServerExprParser.java

@@ -0,0 +1,17 @@
+package com.alibaba.druid.sql.dialect.sqlserver.parser;
+
+import com.alibaba.druid.sql.parser.Lexer;
+import com.alibaba.druid.sql.parser.ParserException;
+import com.alibaba.druid.sql.parser.SQLExprParser;
+
+public class SqlServerExprParser extends SQLExprParser {
+
+    public SqlServerExprParser(Lexer lexer){
+        super(lexer);
+    }
+
+    public SqlServerExprParser(String sql) throws ParserException{
+        super(sql);
+    }
+
+}

src/main/java/com/alibaba/druid/sql/dialect/sqlserver/parser/SqlServerLexer.java

@@ -0,0 +1,28 @@
+package com.alibaba.druid.sql.dialect.sqlserver.parser;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import com.alibaba.druid.sql.parser.Keywords;
+import com.alibaba.druid.sql.parser.Lexer;
+import com.alibaba.druid.sql.parser.Token;
+
+public class SqlServerLexer extends Lexer {
+
+    public final static Keywords DEFAULT_SQL_SERVER_KEYWORDS;
+
+    static {
+        Map<String, Token> map = new HashMap<String, Token>();
+        DEFAULT_SQL_SERVER_KEYWORDS = new Keywords(map);
+    }
+
+    public SqlServerLexer(char[] input, int inputLength, boolean skipComment){
+        super(input, inputLength, skipComment);
+        super.keywods = DEFAULT_SQL_SERVER_KEYWORDS;
+    }
+
+    public SqlServerLexer(String input){
+        super(input);
+        super.keywods = DEFAULT_SQL_SERVER_KEYWORDS;
+    }
+}