diff --git a/src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlEvalVisitorImpl.java b/src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlEvalVisitorImpl.java
index b1571f31fa..d479e2a50d 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlEvalVisitorImpl.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlEvalVisitorImpl.java
@@ -24,6 +24,7 @@ import com.alibaba.druid.sql.ast.expr.SQLBetweenExpr;
 import com.alibaba.druid.sql.ast.expr.SQLBinaryOpExpr;
 import com.alibaba.druid.sql.ast.expr.SQLCaseExpr;
 import com.alibaba.druid.sql.ast.expr.SQLCharExpr;
+import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
 import com.alibaba.druid.sql.ast.expr.SQLInListExpr;
 import com.alibaba.druid.sql.ast.expr.SQLIntegerExpr;
 import com.alibaba.druid.sql.ast.expr.SQLMethodInvokeExpr;
@@ -147,4 +148,8 @@ public class MySqlEvalVisitorImpl extends MySqlASTVisitorAdapter implements SQLE
     public void registerFunction(String funcName, Function function) {
         functions.put(funcName, function);
     }
+
+    public boolean visit(SQLIdentifierExpr x) {
+        return SQLEvalVisitorUtils.visit(this, x);
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/oracle/visitor/OracleEvalVisitor.java b/src/main/java/com/alibaba/druid/sql/dialect/oracle/visitor/OracleEvalVisitor.java
index 72fa05fca5..d1e03a5208 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/oracle/visitor/OracleEvalVisitor.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/oracle/visitor/OracleEvalVisitor.java
@@ -23,6 +23,7 @@ import java.util.Map;
 import com.alibaba.druid.sql.ast.expr.SQLBinaryOpExpr;
 import com.alibaba.druid.sql.ast.expr.SQLCaseExpr;
 import com.alibaba.druid.sql.ast.expr.SQLCharExpr;
+import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
 import com.alibaba.druid.sql.ast.expr.SQLInListExpr;
 import com.alibaba.druid.sql.ast.expr.SQLIntegerExpr;
 import com.alibaba.druid.sql.ast.expr.SQLMethodInvokeExpr;
@@ -134,4 +135,8 @@ public class OracleEvalVisitor extends OracleASTVisitorAdapter implements SQLEva
     public void registerFunction(String funcName, Function function) {
         functions.put(funcName, function);
     }
+    
+    public boolean visit(SQLIdentifierExpr x) {
+        return SQLEvalVisitorUtils.visit(this, x);
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/postgresql/visitor/PGEvalVisitor.java b/src/main/java/com/alibaba/druid/sql/dialect/postgresql/visitor/PGEvalVisitor.java
index dbd13b365a..1efd330256 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/postgresql/visitor/PGEvalVisitor.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/postgresql/visitor/PGEvalVisitor.java
@@ -23,6 +23,7 @@ import java.util.Map;
 import com.alibaba.druid.sql.ast.expr.SQLBinaryOpExpr;
 import com.alibaba.druid.sql.ast.expr.SQLCaseExpr;
 import com.alibaba.druid.sql.ast.expr.SQLCharExpr;
+import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
 import com.alibaba.druid.sql.ast.expr.SQLInListExpr;
 import com.alibaba.druid.sql.ast.expr.SQLIntegerExpr;
 import com.alibaba.druid.sql.ast.expr.SQLMethodInvokeExpr;
@@ -134,4 +135,8 @@ public class PGEvalVisitor extends PGASTVisitorAdapter implements SQLEvalVisitor
     public void registerFunction(String funcName, Function function) {
         functions.put(funcName, function);
     }
+    
+    public boolean visit(SQLIdentifierExpr x) {
+        return SQLEvalVisitorUtils.visit(this, x);
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/visitor/SQLServerEvalVisitor.java b/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/visitor/SQLServerEvalVisitor.java
index 986f0dc6ae..d24e664b2c 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/visitor/SQLServerEvalVisitor.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/visitor/SQLServerEvalVisitor.java
@@ -23,6 +23,7 @@ import java.util.Map;
 import com.alibaba.druid.sql.ast.expr.SQLBinaryOpExpr;
 import com.alibaba.druid.sql.ast.expr.SQLCaseExpr;
 import com.alibaba.druid.sql.ast.expr.SQLCharExpr;
+import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
 import com.alibaba.druid.sql.ast.expr.SQLInListExpr;
 import com.alibaba.druid.sql.ast.expr.SQLIntegerExpr;
 import com.alibaba.druid.sql.ast.expr.SQLMethodInvokeExpr;
@@ -134,4 +135,8 @@ public class SQLServerEvalVisitor extends SQLServerASTVisitorAdapter implements
     public void registerFunction(String funcName, Function function) {
         functions.put(funcName, function);
     }
+    
+    public boolean visit(SQLIdentifierExpr x) {
+        return SQLEvalVisitorUtils.visit(this, x);
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/visitor/SQLEvalVisitor.java b/src/main/java/com/alibaba/druid/sql/visitor/SQLEvalVisitor.java
index 81a4404184..5c3d44d5b7 100644
--- a/src/main/java/com/alibaba/druid/sql/visitor/SQLEvalVisitor.java
+++ b/src/main/java/com/alibaba/druid/sql/visitor/SQLEvalVisitor.java
@@ -22,6 +22,7 @@ import com.alibaba.druid.sql.visitor.functions.Function;
 public interface SQLEvalVisitor extends SQLASTVisitor {
 
     public static final String EVAL_VALUE = "eval.value";
+    public static final String EVAL_EXPR  = "eval.expr";
     public static final Object EVAL_ERROR = new Object();
 
     Function getFunction(String funcName);
diff --git a/src/main/java/com/alibaba/druid/sql/visitor/SQLEvalVisitorImpl.java b/src/main/java/com/alibaba/druid/sql/visitor/SQLEvalVisitorImpl.java
index 013afb6af7..2ec6156c09 100644
--- a/src/main/java/com/alibaba/druid/sql/visitor/SQLEvalVisitorImpl.java
+++ b/src/main/java/com/alibaba/druid/sql/visitor/SQLEvalVisitorImpl.java
@@ -23,6 +23,7 @@ import java.util.Map;
 import com.alibaba.druid.sql.ast.expr.SQLBinaryOpExpr;
 import com.alibaba.druid.sql.ast.expr.SQLCaseExpr;
 import com.alibaba.druid.sql.ast.expr.SQLCharExpr;
+import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
 import com.alibaba.druid.sql.ast.expr.SQLInListExpr;
 import com.alibaba.druid.sql.ast.expr.SQLIntegerExpr;
 import com.alibaba.druid.sql.ast.expr.SQLMethodInvokeExpr;
@@ -128,4 +129,8 @@ public class SQLEvalVisitorImpl extends SQLASTVisitorAdapter implements SQLEvalV
     public void registerFunction(String funcName, Function function) {
         functions.put(funcName, function);
     }
+    
+    public boolean visit(SQLIdentifierExpr x) {
+        return SQLEvalVisitorUtils.visit(this, x);
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/visitor/SQLEvalVisitorUtils.java b/src/main/java/com/alibaba/druid/sql/visitor/SQLEvalVisitorUtils.java
index 3365af2f9b..9596ff4159 100644
--- a/src/main/java/com/alibaba/druid/sql/visitor/SQLEvalVisitorUtils.java
+++ b/src/main/java/com/alibaba/druid/sql/visitor/SQLEvalVisitorUtils.java
@@ -15,6 +15,7 @@
  */
 package com.alibaba.druid.sql.visitor;
 
+import static com.alibaba.druid.sql.visitor.SQLEvalVisitor.EVAL_EXPR;
 import static com.alibaba.druid.sql.visitor.SQLEvalVisitor.EVAL_VALUE;
 
 import java.math.BigDecimal;
@@ -57,6 +58,7 @@ import com.alibaba.druid.sql.dialect.sqlserver.visitor.SQLServerEvalVisitor;
 import com.alibaba.druid.sql.visitor.functions.Ascii;
 import com.alibaba.druid.sql.visitor.functions.Concat;
 import com.alibaba.druid.sql.visitor.functions.Function;
+import com.alibaba.druid.sql.visitor.functions.Hex;
 import com.alibaba.druid.sql.visitor.functions.Instr;
 import com.alibaba.druid.sql.visitor.functions.Lcase;
 import com.alibaba.druid.sql.visitor.functions.Left;
@@ -66,6 +68,7 @@ import com.alibaba.druid.sql.visitor.functions.Reverse;
 import com.alibaba.druid.sql.visitor.functions.Right;
 import com.alibaba.druid.sql.visitor.functions.Trim;
 import com.alibaba.druid.sql.visitor.functions.Ucase;
+import com.alibaba.druid.sql.visitor.functions.Unhex;
 import com.alibaba.druid.util.JdbcUtils;
 import com.alibaba.druid.wall.spi.WallVisitorUtils;
 import com.alibaba.druid.wall.spi.WallVisitorUtils.WallConditionContext;
@@ -158,6 +161,8 @@ public class SQLEvalVisitorUtils {
         functions.put("upper", Ucase.instance);
         functions.put("ucase", Lcase.instance);
         functions.put("lower", Lcase.instance);
+        functions.put("hex", Hex.instance);
+        functions.put("unhex", Unhex.instance);
     }
 
     public static boolean visit(SQLEvalVisitor visitor, SQLMethodInvokeExpr x) {
@@ -709,11 +714,40 @@ public class SQLEvalVisitorUtils {
             }
         }
 
-        if (!left.getAttributes().containsKey(EVAL_VALUE)) {
+        boolean leftHasValue = left.getAttributes().containsKey(EVAL_VALUE);
+        boolean rightHasValue = right.getAttributes().containsKey(EVAL_VALUE);
+
+        if ((!leftHasValue) && !rightHasValue) {
+            SQLExpr leftEvalExpr = (SQLExpr) left.getAttribute(EVAL_EXPR);
+            SQLExpr rightEvalExpr = (SQLExpr) right.getAttribute(EVAL_EXPR);
+
+            if (leftEvalExpr.equals(rightEvalExpr)) {
+                switch (x.getOperator()) {
+                    case Like:
+                    case Equality:
+                    case GreaterThanOrEqual:
+                    case LessThanOrEqual:
+                    case NotLessThan:
+                    case NotGreaterThan:
+                        x.putAttribute(EVAL_VALUE, Boolean.TRUE);
+                        return false;
+                    case NotEqual:
+                    case NotLike:
+                    case GreaterThan:
+                    case LessThan:
+                        x.putAttribute(EVAL_VALUE, Boolean.FALSE);
+                        return false;
+                    default:
+                        break;
+                }
+            }
+        }
+
+        if (!leftHasValue) {
             return false;
         }
 
-        if (!right.getAttributes().containsKey(EVAL_VALUE)) {
+        if (!rightHasValue) {
             return false;
         }
 
@@ -1473,4 +1507,8 @@ public class SQLEvalVisitorUtils {
         return Pattern.matches(regexpr, input);
     }
 
+    public static boolean visit(SQLEvalVisitor visitor, SQLIdentifierExpr x) {
+        x.putAttribute(EVAL_EXPR, x);
+        return false;
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/visitor/functions/Hex.java b/src/main/java/com/alibaba/druid/sql/visitor/functions/Hex.java
index b749b6d4ae..8f679c6d0f 100644
--- a/src/main/java/com/alibaba/druid/sql/visitor/functions/Hex.java
+++ b/src/main/java/com/alibaba/druid/sql/visitor/functions/Hex.java
@@ -15,19 +15,44 @@
  */
 package com.alibaba.druid.sql.visitor.functions;
 
+import static com.alibaba.druid.sql.visitor.SQLEvalVisitor.EVAL_VALUE;
+
+import org.apache.xerces.impl.dv.util.HexBin;
+
+import com.alibaba.druid.sql.ast.SQLExpr;
 import com.alibaba.druid.sql.ast.expr.SQLMethodInvokeExpr;
 import com.alibaba.druid.sql.parser.ParserException;
 import com.alibaba.druid.sql.visitor.SQLEvalVisitor;
 
-
 public class Hex implements Function {
+
     public final static Hex instance = new Hex();
-    
+
     public Object eval(SQLEvalVisitor visitor, SQLMethodInvokeExpr x) {
-        if(x.getParameters().size() != 1) {
+        if (x.getParameters().size() != 1) {
             throw new ParserException("argument's != 1, " + x.getParameters().size());
         }
-        
-        return null;
+
+        SQLExpr param0 = x.getParameters().get(0);
+        param0.accept(visitor);
+
+        Object param0Value = param0.getAttributes().get(EVAL_VALUE);
+        if (param0Value == null) {
+            return SQLEvalVisitor.EVAL_ERROR;
+        }
+
+        if (param0Value instanceof String) {
+            byte[] bytes = ((String) param0Value).getBytes();
+            String result = HexBin.encode(bytes);
+            return result;
+        }
+
+        if (param0Value instanceof Number) {
+            long value = ((Number) param0Value).longValue();
+            String result = Long.toHexString(value).toUpperCase();
+            return result;
+        }
+
+        return SQLEvalVisitor.EVAL_ERROR;
     }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/visitor/functions/Unhex.java b/src/main/java/com/alibaba/druid/sql/visitor/functions/Unhex.java
new file mode 100644
index 0000000000..de1771401c
--- /dev/null
+++ b/src/main/java/com/alibaba/druid/sql/visitor/functions/Unhex.java
@@ -0,0 +1,77 @@
+/*
+ * Copyright 1999-2011 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.druid.sql.visitor.functions;
+
+import static com.alibaba.druid.sql.visitor.SQLEvalVisitor.EVAL_VALUE;
+import static com.alibaba.druid.sql.visitor.SQLEvalVisitor.EVAL_EXPR;
+
+import java.io.UnsupportedEncodingException;
+
+import org.apache.xerces.impl.dv.util.HexBin;
+
+import com.alibaba.druid.sql.ast.SQLExpr;
+import com.alibaba.druid.sql.ast.expr.SQLMethodInvokeExpr;
+import com.alibaba.druid.sql.parser.ParserException;
+import com.alibaba.druid.sql.visitor.SQLEvalVisitor;
+
+public class Unhex implements Function {
+
+    public final static Unhex instance = new Unhex();
+
+    public Object eval(SQLEvalVisitor visitor, SQLMethodInvokeExpr x) {
+        if (x.getParameters().size() != 1) {
+            throw new ParserException("argument's != 1, " + x.getParameters().size());
+        }
+
+        SQLExpr param0 = x.getParameters().get(0);
+
+        if (param0 instanceof SQLMethodInvokeExpr) {
+            SQLMethodInvokeExpr paramMethodExpr = (SQLMethodInvokeExpr) param0;
+            if (paramMethodExpr.getMethodName().equalsIgnoreCase("hex")) {
+                SQLExpr subParamExpr = paramMethodExpr.getParameters().get(0);
+                subParamExpr.accept(visitor);
+
+                Object param0Value = subParamExpr.getAttributes().get(EVAL_VALUE);
+                if (param0Value == null) {
+                    x.putAttribute(EVAL_EXPR, subParamExpr);
+                    return SQLEvalVisitor.EVAL_ERROR;
+                }
+
+                return param0Value;
+            }
+        }
+
+        param0.accept(visitor);
+
+        Object param0Value = param0.getAttributes().get(EVAL_VALUE);
+        if (param0Value == null) {
+            return SQLEvalVisitor.EVAL_ERROR;
+        }
+
+        if (param0Value instanceof String) {
+            byte[] bytes = HexBin.decode((String) param0Value);
+            String result;
+            try {
+                result = new String(bytes, "UTF-8");
+            } catch (UnsupportedEncodingException e) {
+                throw new IllegalStateException(e.getMessage(), e);
+            }
+            return result;
+        }
+
+        return SQLEvalVisitor.EVAL_ERROR;
+    }
+}
diff --git a/src/test/java/com/alibaba/druid/bvt/filter/wall/MySqlWallTest27.java b/src/test/java/com/alibaba/druid/bvt/filter/wall/MySqlWallTest27.java
new file mode 100644
index 0000000000..066312ee9d
--- /dev/null
+++ b/src/test/java/com/alibaba/druid/bvt/filter/wall/MySqlWallTest27.java
@@ -0,0 +1,37 @@
+/*
+ * Copyright 1999-2011 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.druid.bvt.filter.wall;
+
+import junit.framework.TestCase;
+
+import org.junit.Assert;
+
+import com.alibaba.druid.wall.WallUtils;
+
+/**
+ * SQLServerWallTest
+ * 
+ * @author RaymondXiu
+ * @version 1.0, 2012-3-18
+ * @see
+ */
+public class MySqlWallTest27 extends TestCase {
+
+    public void test_false() throws Exception {
+        Assert.assertFalse(WallUtils.isValidateMySql(//
+        "select * from t where hex('abc') = '616263'")); //
+    }
+}
diff --git a/src/test/java/com/alibaba/druid/bvt/filter/wall/MySqlWallTest28.java b/src/test/java/com/alibaba/druid/bvt/filter/wall/MySqlWallTest28.java
new file mode 100644
index 0000000000..28f851b2a1
--- /dev/null
+++ b/src/test/java/com/alibaba/druid/bvt/filter/wall/MySqlWallTest28.java
@@ -0,0 +1,37 @@
+/*
+ * Copyright 1999-2011 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.druid.bvt.filter.wall;
+
+import junit.framework.TestCase;
+
+import org.junit.Assert;
+
+import com.alibaba.druid.wall.WallUtils;
+
+/**
+ * SQLServerWallTest
+ * 
+ * @author RaymondXiu
+ * @version 1.0, 2012-3-18
+ * @see
+ */
+public class MySqlWallTest28 extends TestCase {
+
+    public void test_false() throws Exception {
+        Assert.assertFalse(WallUtils.isValidateMySql(//
+        "select * from t where hex(123) = '7B'")); //
+    }
+}
diff --git a/src/test/java/com/alibaba/druid/bvt/filter/wall/MySqlWallTest29.java b/src/test/java/com/alibaba/druid/bvt/filter/wall/MySqlWallTest29.java
new file mode 100644
index 0000000000..0fd63ebcb4
--- /dev/null
+++ b/src/test/java/com/alibaba/druid/bvt/filter/wall/MySqlWallTest29.java
@@ -0,0 +1,37 @@
+/*
+ * Copyright 1999-2011 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.druid.bvt.filter.wall;
+
+import junit.framework.TestCase;
+
+import org.junit.Assert;
+
+import com.alibaba.druid.wall.WallUtils;
+
+/**
+ * SQLServerWallTest
+ * 
+ * @author RaymondXiu
+ * @version 1.0, 2012-3-18
+ * @see
+ */
+public class MySqlWallTest29 extends TestCase {
+
+    public void test_false() throws Exception {
+        Assert.assertFalse(WallUtils.isValidateMySql(//
+        "select * from t where UNHEX('4D7953514C') = 'MySQL'")); //
+    }
+}
diff --git a/src/test/java/com/alibaba/druid/bvt/filter/wall/MySqlWallTest30.java b/src/test/java/com/alibaba/druid/bvt/filter/wall/MySqlWallTest30.java
new file mode 100644
index 0000000000..fdbd482f66
--- /dev/null
+++ b/src/test/java/com/alibaba/druid/bvt/filter/wall/MySqlWallTest30.java
@@ -0,0 +1,37 @@
+/*
+ * Copyright 1999-2011 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.druid.bvt.filter.wall;
+
+import junit.framework.TestCase;
+
+import org.junit.Assert;
+
+import com.alibaba.druid.wall.WallUtils;
+
+/**
+ * SQLServerWallTest
+ * 
+ * @author RaymondXiu
+ * @version 1.0, 2012-3-18
+ * @see
+ */
+public class MySqlWallTest30 extends TestCase {
+
+    public void test_false() throws Exception {
+        Assert.assertFalse(WallUtils.isValidateMySql(//
+        "select * from t where UNHEX(HEX('MySQL')) = 'MySQL'")); //
+    }
+}
diff --git a/src/test/java/com/alibaba/druid/bvt/filter/wall/MySqlWallTest31.java b/src/test/java/com/alibaba/druid/bvt/filter/wall/MySqlWallTest31.java
new file mode 100644
index 0000000000..744fbfd7b2
--- /dev/null
+++ b/src/test/java/com/alibaba/druid/bvt/filter/wall/MySqlWallTest31.java
@@ -0,0 +1,37 @@
+/*
+ * Copyright 1999-2011 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.druid.bvt.filter.wall;
+
+import junit.framework.TestCase;
+
+import org.junit.Assert;
+
+import com.alibaba.druid.wall.WallUtils;
+
+/**
+ * SQLServerWallTest
+ * 
+ * @author RaymondXiu
+ * @version 1.0, 2012-3-18
+ * @see
+ */
+public class MySqlWallTest31 extends TestCase {
+
+    public void test_false() throws Exception {
+        Assert.assertFalse(WallUtils.isValidateMySql(//
+        "select * from t where UNHEX(HEX(FNAME)) = FNAME")); //
+    }
+}
diff --git a/src/test/java/com/alibaba/druid/bvt/filter/wall/MySqlWallTest32.java b/src/test/java/com/alibaba/druid/bvt/filter/wall/MySqlWallTest32.java
new file mode 100644
index 0000000000..6fe5b9e82d
--- /dev/null
+++ b/src/test/java/com/alibaba/druid/bvt/filter/wall/MySqlWallTest32.java
@@ -0,0 +1,52 @@
+/*
+ * Copyright 1999-2011 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.druid.bvt.filter.wall;
+
+import junit.framework.TestCase;
+
+import org.junit.Assert;
+
+import com.alibaba.druid.wall.WallUtils;
+
+/**
+ * SQLServerWallTest
+ * 
+ * @author RaymondXiu
+ * @version 1.0, 2012-3-18
+ * @see
+ */
+public class MySqlWallTest32 extends TestCase {
+
+    public void test_false() throws Exception {
+        Assert.assertFalse(WallUtils.isValidateMySql(//
+        "select * from t where NOT(UNHEX(HEX(FNAME)) != FNAME)")); //
+    }
+    
+    public void test_false_1() throws Exception {
+        Assert.assertFalse(WallUtils.isValidateMySql(//
+        "select * from t where NOT(UNHEX(HEX(FNAME)) > FNAME)")); //
+    }
+    
+    public void test_false_2() throws Exception {
+        Assert.assertFalse(WallUtils.isValidateMySql(//
+        "select * from t where NOT(UNHEX(HEX(FNAME)) < FNAME)")); //
+    }
+    
+    public void test_false_3() throws Exception {
+        Assert.assertFalse(WallUtils.isValidateMySql(//
+        "select * from t where NOT(UNHEX(HEX(FNAME)) NOT LIKE FNAME)")); //
+    }
+}
diff --git a/src/test/java/com/alibaba/druid/mysql/MySqlHexTest.java b/src/test/java/com/alibaba/druid/mysql/MySqlHexTest.java
new file mode 100644
index 0000000000..ace0aa96b6
--- /dev/null
+++ b/src/test/java/com/alibaba/druid/mysql/MySqlHexTest.java
@@ -0,0 +1,69 @@
+/*
+ * Copyright 1999-2011 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.druid.mysql;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+
+import junit.framework.TestCase;
+
+import com.alibaba.druid.pool.DruidDataSource;
+import com.alibaba.druid.util.JdbcUtils;
+
+public class MySqlHexTest extends TestCase {
+    final int COUNT = 800;
+    
+    private String          jdbcUrl;
+    private String          user;
+    private String          password;
+    private String          driverClass;
+
+    private DruidDataSource dataSource;
+
+    protected void setUp() throws Exception {
+        jdbcUrl = "jdbc:mysql://10.20.149.16:3306/circe0_test";
+        user = "circe";
+        password = "circe";
+        driverClass = "com.mysql.jdbc.Driver";
+
+        dataSource = new DruidDataSource();
+        dataSource.setDriverClassName(driverClass);
+        dataSource.setUrl(jdbcUrl);
+        dataSource.setPoolPreparedStatements(true);
+        dataSource.setUsername(user);
+        dataSource.setPassword(password);
+
+    }
+
+
+    public void test_0() throws Exception {
+
+        Connection conn = dataSource.getConnection();
+
+        String sql = "select hex('123'),hex(123)";
+
+        PreparedStatement stmt = conn.prepareStatement(sql);
+
+        ResultSet rs = stmt.executeQuery();
+        JdbcUtils.printResultSet(rs);
+        rs.close();
+        stmt.close();
+
+        conn.close();
+    }
+
+}