refactor

src/main/java/com/alibaba/druid/filter/wall/WallConfig.java

@@ -11,6 +11,7 @@ public class WallConfig {
 
     private boolean             selelctAllow               = true;
     private boolean             selectIntoAllow            = true;
+    private boolean             selectIntoOutfileAllow     = false;
     private boolean             selectWhereAlwayTrueCheck  = true;
     private boolean             selectHavingAlwayTrueCheck = true;
 
@@ -90,6 +91,14 @@ public class WallConfig {
         this.selectIntoAllow = selectIntoAllow;
     }
 
+    public boolean isSelectIntoOutfileAllow() {
+        return selectIntoOutfileAllow;
+    }
+
+    public void setSelectIntoOutfileAllow(boolean selectIntoOutfileAllow) {
+        this.selectIntoOutfileAllow = selectIntoOutfileAllow;
+    }
+
     public boolean isSelectWhereAlwayTrueCheck() {
         return selectWhereAlwayTrueCheck;
     }

src/main/java/com/alibaba/druid/filter/wall/spi/MySqlWallVisitor.java

@@ -167,8 +167,11 @@ public class MySqlWallVisitor extends MySqlASTVisitorAdapter implements WallVisi
 
     @Override
     public boolean visit(MySqlOutFileExpr x) {
-        violations.add(new IllegalSQLObjectViolation(SQLUtils.toMySqlString(x)));
-        return false;
+        if (!config.isSelectIntoOutfileAllow()) {
+            violations.add(new IllegalSQLObjectViolation(SQLUtils.toMySqlString(x)));
+        }
+
+        return true;
     }
 
     @Override