Added tester and DbComparer

SqlTable.cs

@@ -14,16 +14,22 @@ namespace DbMigrate {
 
 
         public SqlTable() {
-            Columns = new Dictionary<string, string>();
-            Indexes = new Dictionary<string, string>();
-            Triggers = new Dictionary<string, string>();
+            initTable();
         }
 
         public SqlTable(string sql) {
+            initTable();
             OriginalSql = sql;
             this.ParseSql(sql);
         }
 
+        private void initTable() {
+            Columns = new Dictionary<string, string>();
+            Indexes = new Dictionary<string, string>();
+            Triggers = new Dictionary<string, string>();
+            CreateTableSql = "";
+        }
+
         public string FullSql() {
             StringBuilder sb = new StringBuilder();
             //sb.AppendLine("-- Create Table " + TableName);
@@ -67,6 +73,14 @@ namespace DbMigrate {
             return Triggers.Values.ToArray();
         }
 
+        public bool HasTrigger(string triggerName) {
+            return Triggers.ContainsKey(triggerName);
+        }
+
+        public bool HasIndex(string indexName) {
+            return Indexes.ContainsKey(indexName);
+        }
+
         public string[] GetIndexNames() {
             return Indexes.Keys.ToArray();
         }