export sql parameter ignore null.

src/test/java/com/alibaba/druid/bvt/sql/mysql/param/MySqlParameterizedOutputVisitorTest_14.java

@@ -0,0 +1,25 @@
+package com.alibaba.druid.bvt.sql.mysql.param;
+
+import com.alibaba.druid.sql.visitor.ParameterizedOutputVisitorUtils;
+import com.alibaba.druid.util.JdbcConstants;
+import junit.framework.TestCase;
+
+/**
+ * Created by wenshao on 16/8/23.
+ */
+public class MySqlParameterizedOutputVisitorTest_14 extends TestCase {
+    public void test_for_parameterize() throws Exception {
+        final String dbType = JdbcConstants.MYSQL;
+
+        String sql = "insert into\n" +
+                "\t\tt_temp (processId,resultId,gmt_create,gmt_modified,result_content,result_number)\n" +
+                "\t\tvalues\n" +
+                "\t\t  \n" +
+                "\t\t\t('4254cc14-1c83-4eaf-95ae-59438dd0cc17', '5fd20fa9-7659-4f8b-a4c2-2021a48317d8', now(),now(),null,null)";
+        String psql = ParameterizedOutputVisitorUtils.parameterize(sql, dbType);
+        assertEquals("INSERT INTO t_temp (processId, resultId, gmt_create, gmt_modified, result_content\n" +
+                "\t, result_number)\n" +
+                "VALUES (?, ?, now(), now(), NULL\n" +
+                "\t\t, NULL)", psql);
+    }
+}