improve sql parser

src/main/java/com/alibaba/druid/sql/ast/expr/SQLIdentifierExpr.java

@@ -15,7 +15,6 @@
  */
 package com.alibaba.druid.sql.ast.expr;
 
-import com.alibaba.druid.sql.SQLUtils;
 import com.alibaba.druid.sql.ast.SQLExprImpl;
 import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
@@ -58,8 +57,8 @@ public class SQLIdentifierExpr extends SQLExprImpl implements SQLName {
         this.lowerName = lowerName;
     }
 
-    public String toString() {
-        return SQLUtils.toSQLString(this);
+    public void output(StringBuffer buf) {
+        buf.append(this.name);
     }
 
     protected void accept0(SQLASTVisitor visitor) {

src/main/java/com/alibaba/druid/sql/ast/statement/SQLCallStatement.java

@@ -21,14 +21,27 @@ import java.util.List;
 import com.alibaba.druid.sql.ast.SQLExpr;
 import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.ast.SQLStatementImpl;
+import com.alibaba.druid.sql.ast.expr.SQLVariantRefExpr;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
 public class SQLCallStatement extends SQLStatementImpl {
 
+    private boolean             brace      = false;
+
+    private SQLVariantRefExpr   outParameter;
+
     private SQLName             procedureName;
 
     private final List<SQLExpr> parameters = new ArrayList<SQLExpr>();
 
+    public SQLVariantRefExpr getOutParameter() {
+        return outParameter;
+    }
+
+    public void setOutParameter(SQLVariantRefExpr outParameter) {
+        this.outParameter = outParameter;
+    }
+
     public SQLName getProcedureName() {
         return procedureName;
     }
@@ -41,11 +54,21 @@ public class SQLCallStatement extends SQLStatementImpl {
         return parameters;
     }
 
+    public boolean isBrace() {
+        return brace;
+    }
+
+    public void setBrace(boolean brace) {
+        this.brace = brace;
+    }
+
     protected void accept0(SQLASTVisitor visitor) {
         if (visitor.visit(this)) {
+            acceptChild(visitor, this.outParameter);
             acceptChild(visitor, this.procedureName);
             acceptChild(visitor, this.parameters);
         }
         visitor.endVisit(this);
     }
+
 }