Update Query Generation to templates

Author: RohitM-IN

QueryTemplates.cs

@@ -0,0 +1,76 @@
+using DbSyncKit.Templates.Interface;
+using HandlebarsDotNet;
+
+namespace DbSyncKit.Templates.MySql
+{
+    public class QueryTemplates : IQueryTemplates
+    {
+        #region Public Properties
+        public HandlebarsTemplate<object, object> SELECT_QUERY => _selectQueryTemplate.Value;
+        public HandlebarsTemplate<object, object> INSERT_QUERY => _insertQueryTemplate.Value;
+        public HandlebarsTemplate<object, object> UPDATE_QUERY => _updateQueryTemplate.Value;
+        public HandlebarsTemplate<object, object> DELETE_QUERY => _deleteQueryTemplate.Value;
+        public HandlebarsTemplate<object, object> COMMENT_QUERY => _commentQueryTemplate.Value;
+
+        #endregion
+
+        #region Private Properties
+
+        private static Lazy<HandlebarsTemplate<object, object>> _selectQueryTemplate = new Lazy<HandlebarsTemplate<object, object>>(CreateSelectQueryTemplate);
+        private static Lazy<HandlebarsTemplate<object, object>> _insertQueryTemplate = new Lazy<HandlebarsTemplate<object, object>>(CreateInsertQueryTemplate);
+        private readonly Lazy<HandlebarsTemplate<object, object>> _updateQueryTemplate = new Lazy<HandlebarsTemplate<object, object>>(CreateUpdateQueryTemplate);
+        private readonly Lazy<HandlebarsTemplate<object, object>> _deleteQueryTemplate = new Lazy<HandlebarsTemplate<object, object>>(CreateDeleteQueryTemplate);
+        private readonly Lazy<HandlebarsTemplate<object, object>> _commentQueryTemplate = new Lazy<HandlebarsTemplate<object, object>>(CreateCommentQueryTemplate);
+        #endregion
+
+        #region Templates
+
+        private static HandlebarsTemplate<object, object> CreateSelectQueryTemplate()
+        {
+            var str = @" SELECT {{Join Columns}} FROM {{TableName}}; ";
+
+            return Handlebars.Compile(str);
+        }
+
+        private static HandlebarsTemplate<object, object> CreateInsertQueryTemplate()
+        {
+            var str = @" 
+INSERT INTO `{{TableName}}` ({{Join Columns}}) SELECT {{Join Values}} FROM DUAL WHERE NOT EXISTS ( SELECT 1 FROM `{{TableName}}` WHERE {{And Where}} )
+";
+
+            return Handlebars.Compile(str);
+        }
+
+        private static HandlebarsTemplate<object, object> CreateUpdateQueryTemplate()
+        {
+            var str = @"
+UPDATE `{{TableName}}` SET {{Join Set}} WHERE {{And Where}} LIMIT 1; 
+";
+            return Handlebars.Compile(str);
+        }
+
+        private static HandlebarsTemplate<object, object> CreateDeleteQueryTemplate()
+        {
+            var str = @"
+DELETE FROM {{TableName}} WHERE {{And Where}} LIMIT 1;  ";
+
+            return Handlebars.Compile(str);
+        }
+
+        private static HandlebarsTemplate<object, object> CreateCommentQueryTemplate()
+        {
+            var str = @"{{#if !isMultiLine}} -- {{comment}}
+{{else}}
+/* 
+{{comment}}
+*/
+{{/if}}";
+
+            return Handlebars.Compile(str);
+        }
+        #endregion
+
+
+
+    }
+}