improved sql parser.

src/test/java/com/alibaba/druid/benckmark/FnvHashTest.java

@@ -0,0 +1,38 @@
+package com.alibaba.druid.benckmark;
+
+import com.alibaba.druid.util.FnvHash;
+import junit.framework.TestCase;
+
+public class FnvHashTest extends TestCase {
+    static String sql = "SELECT id, item_id, rule_id, tag_id, ext , gmt_create, gmt_modified FROM wukong_preview_item_tag WHERE item_id = ? AND rule_id = ?";
+    static char[] chars = sql.toCharArray();
+
+    public void test_perf_fnv() throws Exception {
+        for (int i = 0; i < 5; ++i) {
+//            perf_hashCode64(sql); // 168
+            perf_hashCode64(chars); // 169
+        }
+    }
+
+    public long perf_hashCode64(String sql) {
+        long val = 0;
+        long startMillis = System.currentTimeMillis();
+        for (int i = 0; i < 1000 * 1000; ++i) {
+            val = FnvHash.fnv1a_64(sql);
+        }
+        long millis = System.currentTimeMillis() - startMillis;
+        System.out.println("millis : " + millis);
+        return val;
+    }
+
+    public long perf_hashCode64(char[] sql) {
+        long val = 0;
+        long startMillis = System.currentTimeMillis();
+        for (int i = 0; i < 1000 * 1000; ++i) {
+            val = FnvHash.fnv1a_64(sql);
+        }
+        long millis = System.currentTimeMillis() - startMillis;
+        System.out.println("millis : " + millis);
+        return val;
+    }
+}