public static string GetShardingAlgorithm(this IDataBaseSharding dataBaseSharding, int id = MatchedID.All)
{
string result = string.Empty;
var databaseShardingAttribute = GetDataBaseShardingAttribute(dataBaseSharding, id);
if (databaseShardingAttribute == null)
{
return(result);
}
var algorithm = databaseShardingAttribute.ShardingAlgorithm;
return(algorithm);
}
public static List <ShardingParameter> GetShardingColumnValues(this IDataBaseSharding dataBaseSharding, int id = MatchedID.All)
{
var properties = dataBaseSharding.GetType().GetProperties();
List <ShardingParameter> shardingColumnObjects = new List <ShardingParameter>();
foreach (var property in properties)
{
var shardingColumns = property.GetCustomAttributes(typeof(ShardingColumnAttribute), true)?.Select(w => (ShardingColumnAttribute)w)?.ToList();
var shardingColumn = shardingColumns.FindAll(w => w.ID == id).FirstOrDefault();
if (shardingColumn != null)
{
shardingColumnObjects.Add(new ShardingParameter {
Key = shardingColumn.Key, Value = property.GetValue(dataBaseSharding, null)
});
}
}
return(shardingColumnObjects);
}
public static void DataBaseSharding(this IDataBaseSharding dataBaseSharding, int id = MatchedID.All, string tableIndex = null)
{
if (dataBaseSharding == null)
{
return;
}
var shardingValues = dataBaseSharding.GetShardingColumnValues();
var fatabaseShardingAttribute = dataBaseSharding.GetDataBaseShardingAttribute(id);
if (fatabaseShardingAttribute == null)
{
return;
}
var algorithm = fatabaseShardingAttribute.ShardingAlgorithm;
var shardingTotal = fatabaseShardingAttribute.ShardingMaxCount;
ISharding sharding = Activator.CreateInstance(Type.GetType(algorithm)) as ISharding;
dataBaseSharding.__DataBaseIndex__ = sharding.SharingByObject(shardingValues, shardingTotal);
}
public static DataBaseShardingAttribute GetDataBaseShardingAttribute(this IDataBaseSharding dataBaseSharding, int id = MatchedID.All)
{
var databaseShardingAttribute = dataBaseSharding.GetCustomerAttributes <DataBaseShardingAttribute>().FirstOrDefault(w => w.ID == id);
return(databaseShardingAttribute);
}
