public static CreateCommand ( IDbConnection conn, IDbTransaction tx, string sql, object args = null ) : IDbCommand | ||
conn | IDbConnection | The connection |
tx | IDbTransaction | |
sql | string | The sql statement |
args | object | The parameters |
Результат | IDbCommand |
/// <summary> /// Creates a database command to update the database with the given record. /// </summary> /// <param name="conn">The current database connection</param> /// <param name="record">The record to update</param> /// <param name="tx">Optional transaction to run the update in</param> /// <returns>The command</returns> private IDbCommand CreateUpdateCommand(IDbConnection conn, IDbTransaction tx = null) { List <object> args = new List <object>(); // Build set statement string values = ""; foreach (string key in Columns.Keys) { // Exclude joined & read only members if (!Attributes[key].ReadOnly && String.IsNullOrEmpty(Attributes[key].Table)) { values += (values != "" ? "," : "") + key + " = @" + args.Count.ToString(); // Check if the ActiveField is marked with the OnSave property. if (!String.IsNullOrEmpty(Attributes[key].OnSave)) { MethodInfo m = this.GetType().GetMethod(Attributes[key].OnSave, BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance); args.Add(m.Invoke(this, new object[] { Columns[key].GetValue(this, null) })); } else { if (Columns[key].PropertyType == typeof(HtmlString) && Columns[key].GetValue(this, null) != null) { args.Add(((HtmlString)Columns[key].GetValue(this, null)).ToHtmlString()); } else if (typeof(Enum).IsAssignableFrom(Columns[key].PropertyType)) { args.Add(Columns[key].GetValue(this, null).ToString()); } else if (Attributes[key].Json) { JavaScriptSerializer json = new JavaScriptSerializer(); args.Add(json.Serialize(Columns[key].GetValue(this, null))); } else { args.Add(Columns[key].GetValue(this, null)); } } } } // Build where clause string where = ""; //PrimaryKey + "=@" + args.Count.ToString() ; foreach (string pk in PrimaryKeys) { where += (where != "" ? " AND " : "") + pk + "=@" + args.Count.ToString(); args.Add(Columns[pk].GetValue(this, null)); } //args.Add(Columns[PrimaryKey].GetValue(this, null)) ; // Create command IDbCommand cmd = Database.CreateCommand(conn, /*tx*/ null, String.Format(SqlUpdate, TableName, values, where), args.ToArray()); if (tx != null) { cmd.Transaction = tx; } return(cmd); }
/// <summary> /// Executes the given query and returns the matching records. /// </summary> /// <param name="query">The query to run</param> /// <param name="args">Optional query parameters</param> /// <returns>A list of records</returns> public static List <T> Query(string query, params object[] args) { List <T> result = new List <T>(); var tx = args.Count() > 0 && args[0] is IDbTransaction ? (IDbTransaction)args[0] : null; using (IDbConnection conn = tx != null ? null : Database.OpenConnection()) { using (IDbCommand cmd = Database.CreateCommand(tx != null ? tx.Connection : conn, tx, query, args)) { using (IDataReader rdr = cmd.ExecuteReader(CommandBehavior.Default)) { while (rdr.Read()) { // Create and fill object object o = Activator.CreateInstance <T>(); for (int n = 0; n < rdr.FieldCount; n++) { if (Columns.ContainsKey(rdr.GetName(n))) { object val = rdr[n] != DBNull.Value ? rdr[n] : null; string name = rdr.GetName(n); // If this is JSON, deserialize before possible OnLoad method if (Attributes[name].Json) { try { JavaScriptSerializer json = new JavaScriptSerializer(); val = json.Deserialize(Convert.ToString(val), Columns[name].PropertyType); } catch { val = null; } if (val == null) { val = Activator.CreateInstance(Columns[name].PropertyType); } } // Check if the property is marked with the "OnLoad" property if (!String.IsNullOrEmpty(Attributes[name].OnLoad)) { MethodInfo m = o.GetType().GetMethod(Attributes[name].OnLoad, BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance); val = m.Invoke(o, new object[] { val }); } else { // Automatically convert strings to HtmlString if needed. if (Columns[name].PropertyType == typeof(HtmlString)) { val = new HtmlString(Convert.ToString(val)); } else if (typeof(Enum).IsAssignableFrom(Columns[name].PropertyType)) { val = Enum.Parse(Columns[name].PropertyType, (string)val); } // Extra type conversions for MySql if (Database.IsMySql) { if (Columns[name].PropertyType == typeof(Guid) && val == null) { val = Guid.Empty; } else if (Columns[name].PropertyType == typeof(Guid) && val.GetType() == typeof(string)) { val = new Guid((string)val); } else if (Columns[name].PropertyType == typeof(bool) && val.GetType() == typeof(ulong)) { val = (ulong)val == 1; } } } Columns[name].SetValue(o, val, null); } } // Set correct object state if (o is ActiveRecord <T> ) { ((ActiveRecord <T>)o).IsNew = false; } result.Add((T)o); } } } } return(result); }