Sync Algorithm updated for better performance on large data

Author: RohitM-IN

src/Connection.cs

@@ -5,6 +5,13 @@
 
 namespace DbSyncKit.PostgreSQL
 {
+    /// <summary>
+    /// Represents a connection to a database, implementing the <see cref="IDatabase"/> interface.
+    /// </summary>
+    /// <remarks>
+    /// This class provides a generic representation of a database connection and includes methods
+    /// defined in the <see cref="IDatabase"/> interface for executing queries and managing transactions.
+    /// </remarks>
     public class Connection : IDatabase
     {
         #region Declaration
@@ -51,7 +58,7 @@ public Connection(string host, int port, string database, string userID, string
         /// <returns>A string representing the PostgreSQL connection string.</returns>
         public string GetConnectionString()
         {
-            NpgsqlConnectionStringBuilder builder = new NpgsqlConnectionStringBuilder
+            NpgsqlConnectionStringBuilder builder = new()
             {
                 Host = Host,
                 Port = Port,
@@ -74,12 +81,12 @@ public DataSet ExecuteQuery(string query, string tableName)
         {
             try
             {
-                using (NpgsqlConnection npgSqlConnection = new NpgsqlConnection(GetConnectionString()))
+                using (NpgsqlConnection npgSqlConnection = new(GetConnectionString()))
                 {
                     npgSqlConnection.Open();
 
-                    using (NpgsqlDataAdapter npgSqlDataAdapter = new NpgsqlDataAdapter(query, npgSqlConnection))
-                    using (DataSet dataset = new DataSet())
+                    using (NpgsqlDataAdapter npgSqlDataAdapter = new(query, npgSqlConnection))
+                    using (DataSet dataset = new())
                     {
                         npgSqlDataAdapter.Fill(dataset, tableName);
                         return dataset;
@@ -101,7 +108,7 @@ public bool TestConnection()
         {
             try
             {
-                using (NpgsqlConnection npgSqlConnection = new NpgsqlConnection(GetConnectionString()))
+                using (NpgsqlConnection npgSqlConnection = new(GetConnectionString()))
                 {
                     npgSqlConnection.Open();
                     npgSqlConnection.Close();

src/QueryGenerator.cs

@@ -44,7 +44,7 @@ public QueryGenerator()
         /// <param name="schemaName">Optional schema name, default is 'public'.</param>
         /// <returns>Select Query in string.</returns>
         /// <exception cref="ArgumentException">Thrown when table name or columns are null or empty.</exception>
-        public string GenerateSelectQuery<T>(string tableName, List<string> listOfColumns, string schemaName) where T : IDataContractComparer
+        public string GenerateSelectQuery<T>(string tableName, List<string> listOfColumns, string schemaName) where T : IDataContract
         {
             if (string.IsNullOrEmpty(tableName) || listOfColumns == null || listOfColumns.Count == 0)
             {
@@ -78,11 +78,11 @@ public string GenerateSelectQuery<T>(string tableName, List<string> listOfColumn
         /// <param name="excludedColumns">List of excluded columns.</param>
         /// <param name="editedProperties">Dictionary of edited properties.</param>
         /// <returns>Update Query in string.</returns>
-        public string GenerateUpdateQuery<T>(T DataContract, List<string> keyColumns, List<string> excludedColumns, Dictionary<string, object> editedProperties) where T : IDataContractComparer
+        public string GenerateUpdateQuery<T>(T DataContract, List<string> keyColumns, List<string> excludedColumns, (string propName, object propValue)[] editedProperties) where T : IDataContract
         {
             string tableName = GetTableName<T>();
             string schemaName = GetTableSchema<T>() ?? DEFAULT_SCHEMA_NAME;
-            List<string> setClause = editedProperties.Select(kv => $"{EscapeColumn(kv.Key)} = '{EscapeValue(kv.Value)}'").ToList();
+            List<string> setClause = editedProperties.Select(kv => $"{EscapeColumn(kv.propName)} = '{EscapeValue(kv.propValue)}'").ToList();
             List<string> condition = GetCondition(DataContract, keyColumns);
 
             return _template.UpdateTemplate.Render(new TemplateContext(new
@@ -101,7 +101,7 @@ public string GenerateUpdateQuery<T>(T DataContract, List<string> keyColumns, Li
         /// <param name="entity">The entity to be deleted.</param>
         /// <param name="keyColumns">List of key columns.</param>
         /// <returns>Delete Query in string.</returns>
-        public string GenerateDeleteQuery<T>(T entity, List<string> keyColumns) where T : IDataContractComparer
+        public string GenerateDeleteQuery<T>(T entity, List<string> keyColumns) where T : IDataContract
         {
             string tableName = GetTableName<T>();
             string schemaName = GetTableSchema<T>() ?? DEFAULT_SCHEMA_NAME;
@@ -123,7 +123,7 @@ public string GenerateDeleteQuery<T>(T entity, List<string> keyColumns) where T
         /// <param name="keyColumns">List of key columns.</param>
         /// <param name="excludedColumns">List of excluded columns.</param>
         /// <returns>Insert Query in string.</returns>
-        public string GenerateInsertQuery<T>(T entity, List<string> keyColumns, List<string> excludedColumns) where T : IDataContractComparer
+        public string GenerateInsertQuery<T>(T entity, List<string> keyColumns, List<string> excludedColumns) where T : IDataContract
         {
             string tableName = GetTableName<T>();
             string schemaName = GetTableSchema<T>() ?? DEFAULT_SCHEMA_NAME;
@@ -183,11 +183,11 @@ public void Dispose()
         /// <summary>
         /// Generates a SQL WHERE clause based on the specified entity and key columns.
         /// </summary>
-        /// <typeparam name="T">The type of the entity that implements IDataContractComparer.</typeparam>
+        /// <typeparam name="T">The type of the entity that implements IDataContract.</typeparam>
         /// <param name="entity">The entity for which the condition is generated.</param>
         /// <param name="keyColumns">The list of key columns used to create the condition.</param>
         /// <returns>A string representing the SQL WHERE clause based on the key columns of the entity.</returns>
-        public List<string> GetCondition<T>(T entity, List<string> keyColumns) where T : IDataContractComparer
+        public List<string> GetCondition<T>(T entity, List<string> keyColumns) where T : IDataContract
         {
             Type entityType = typeof(T);
             PropertyInfo[] keyProperties = GetKeyProperties<T>();
@@ -218,7 +218,7 @@ public string EscapeColumn(string? input)
             if(input is string && input.Contains(" "))
                 return $"\"{input}\"";
 
-            return input.ToString();
+            return input?.ToString() ?? string.Empty;
         }
 
         /// <summary>