/// <summary>
 /// 构造方法。
 /// </summary>
 /// <param name="providerName">数据库提供者名称</param>
 /// <param name="connectionString">数据库连接字符串</param>
 public PostgreSQLDynamicQueryProvider(string providerName, string connectionString)
     : base(providerName, connectionString)
 {
     this._dbHelper.DbMetadata = new PostgreSQLMetadata();
     this._dbTypeResolve = new DbTypeResolve(DatabaseType.PostgreSQL);
 }
 /// <summary>
 /// 构造方法。
 /// </summary>
 public PostgreSQLDynamicQueryProvider(string connectionStringName = "Default")
     : base(connectionStringName)
 {
     this._dbHelper.DbMetadata = new PostgreSQLMetadata();
     this._dbTypeResolve = new DbTypeResolve(DatabaseType.PostgreSQL);
 }