public Status(XCon xCon)
{
this.xCon = xCon;
}
/// <summary>
/// Alters table based on attribute "MysqlCreateType" information
/// </summary>
/// <param name="t">Type of object</param>
/// <param name="database">Database name</param>
/// <param name="table">Table name</param>
/// <param name="xcon">Multicon / Onecon instance</param>
/// <param name="dropUnusedColumns">Removes unused columns</param>
/// <returns></returns>
public static string GetAlterTableString(Type t, string database, string table, XCon xcon, bool dropUnusedColumns)
{
StringBuilder sb = new StringBuilder();
List <string> existingDatabaseColumns = xcon.GetColumn <string>("SELECT `COLUMN_NAME` FROM `information_schema`.`COLUMNS` WHERE `TABLE_SCHEMA` LIKE @database AND `TABLE_NAME` LIKE @table", 0, false, new ParameterData("database", database), new ParameterData("table", table)).ToList();
Dictionary <string, string> existingTypeColumns = new Dictionary <string, string>();
foreach (var prop in t.GetProperties())
{
foreach (var cust in prop
.GetCustomAttributes(false)
.Where(n =>
n != null && n.GetType() == typeof(MySqlColumnAttribute))
.Select(n => (MySqlColumnAttribute)n)
)
{
existingTypeColumns.Add(string.IsNullOrWhiteSpace(cust.DatabaseColumnName) ? prop.Name : cust.DatabaseColumnName, cust.MysqlCreateType);
}
}
if (dropUnusedColumns)
{
foreach (string remove in existingDatabaseColumns
.Where(n => !existingTypeColumns.ContainsKey(n)))
{
sb.Append("ALTER TABLE `" + database + "`.`" + table + "` DROP COLUMN " + remove + ";\n");
}
}
foreach (var add in existingTypeColumns
.Where(n => !existingDatabaseColumns.Any(n2 => n2.IndexOf(n.Key, StringComparison.InvariantCultureIgnoreCase) > -1)))
{
sb.Append("ALTER TABLE `" + database + "`.`" + table + "` ADD " + add.Key + " " + add.Value + ";\n");
}
return(sb.ToString());
}
