private static BulkMergeResult <T> InternalBulkMerge <T>(this DbContext context, IEnumerable <T> entities, BulkMergeOptions <T> options)
{
int rowsAffected = 0;
var outputRows = new List <BulkMergeOutputRow <T> >();
var tableMapping = context.GetTableMapping(typeof(T));
int rowsInserted = 0;
int rowsUpdated = 0;
int rowsDeleted = 0;
using (var dbTransactionContext = new DbTransactionContext(context))
{
var dbConnection = dbTransactionContext.Connection;
var transaction = dbTransactionContext.CurrentTransaction;
try
{
string stagingTableName = CommonUtil.GetStagingTableName(tableMapping, options.UsePermanentTable, dbConnection);
string destinationTableName = string.Format("[{0}].[{1}]", tableMapping.Schema, tableMapping.TableName);
string[] columnNames = tableMapping.GetNonValueGeneratedColumns().ToArray();
string[] storeGeneratedColumnNames = tableMapping.GetPrimaryKeyColumns().ToArray();
if (storeGeneratedColumnNames.Length == 0 && options.MergeOnCondition == null)
{
throw new InvalidDataException("BulkMerge requires that the entity have a primary key or the Options.MergeOnCondition must be set.");
}
context.Database.CloneTable(destinationTableName, stagingTableName, null, Common.Constants.InternalId_ColumnName);
var bulkInsertResult = BulkInsert(entities, options, tableMapping, dbConnection, transaction, stagingTableName, null, SqlBulkCopyOptions.KeepIdentity, true);
IEnumerable <string> columnsToInsert = CommonUtil.FormatColumns(columnNames.Where(o => !options.GetIgnoreColumnsOnInsert().Contains(o)));
IEnumerable <string> columnstoUpdate = CommonUtil.FormatColumns(columnNames.Where(o => !options.GetIgnoreColumnsOnUpdate().Contains(o))).Select(o => string.Format("t.{0}=s.{0}", o));
List <string> columnsToOutput = new List <string> {
"$Action", string.Format("{0}.{1}", "s", Constants.InternalId_ColumnName)
};
List <PropertyInfo> propertySetters = new List <PropertyInfo>();
Type entityType = typeof(T);
foreach (var storeGeneratedColumnName in storeGeneratedColumnNames)
{
columnsToOutput.Add(string.Format("inserted.[{0}]", storeGeneratedColumnName));
columnsToOutput.Add(string.Format("deleted.[{0}]", storeGeneratedColumnName));
propertySetters.Add(entityType.GetProperty(storeGeneratedColumnName));
}
string mergeSqlText = string.Format("MERGE {0} t USING {1} s ON ({2}) WHEN NOT MATCHED BY TARGET THEN INSERT ({3}) VALUES ({3}) WHEN MATCHED THEN UPDATE SET {4}{5}OUTPUT {6};",
destinationTableName, stagingTableName, CommonUtil <T> .GetJoinConditionSql(options.MergeOnCondition, storeGeneratedColumnNames, "s", "t"),
SqlUtil.ConvertToColumnString(columnsToInsert),
SqlUtil.ConvertToColumnString(columnstoUpdate),
options.DeleteIfNotMatched ? " WHEN NOT MATCHED BY SOURCE THEN DELETE " : " ",
SqlUtil.ConvertToColumnString(columnsToOutput)
);
var bulkQueryResult = context.BulkQuery(mergeSqlText, dbConnection, transaction, options);
rowsAffected = bulkQueryResult.RowsAffected;
foreach (var result in bulkQueryResult.Results)
{
string id = string.Empty;
object entity = null;
string action = (string)result[0];
if (action != SqlMergeAction.Delete)
{
int entityId = (int)result[1];
id = (storeGeneratedColumnNames.Length > 0 ? Convert.ToString(result[2]) : "PrimaryKeyMissing");
entity = bulkInsertResult.EntityMap[entityId];
if (options.AutoMapOutputIdentity && entity != null)
{
for (int i = 2; i < 2 + storeGeneratedColumnNames.Length; i++)
{
propertySetters[0].SetValue(entity, result[i]);
}
}
}
else
{
id = Convert.ToString(result[2 + storeGeneratedColumnNames.Length]);
}
outputRows.Add(new BulkMergeOutputRow <T>(action, id));
if (action == SqlMergeAction.Insert)
{
rowsInserted++;
}
else if (action == SqlMergeAction.Update)
{
rowsUpdated++;
}
else if (action == SqlMergeAction.Delete)
{
rowsDeleted++;
}
}
context.Database.DropTable(stagingTableName);
//ClearEntityStateToUnchanged(context, entities);
dbTransactionContext.Commit();
}
catch (Exception)
{
dbTransactionContext.Rollback();
throw;
}
return(new BulkMergeResult <T>
{
Output = outputRows,
RowsAffected = rowsAffected,
RowsDeleted = rowsDeleted,
RowsInserted = rowsInserted,
RowsUpdated = rowsUpdated,
});
}
}
public async static Task <BulkMergeResult <T> > BulkMergeAsync <T>(this DbContext context, IEnumerable <T> entities, BulkMergeOptions <T> options, CancellationToken cancellationToken = default)
{
return(await InternalBulkMergeAsync(context, entities, options, cancellationToken));
}
public static BulkMergeResult <T> BulkMerge <T>(this DbContext context, IEnumerable <T> entities, BulkMergeOptions <T> options)
{
return(InternalBulkMerge(context, entities, options));
}
public static BulkMergeResult <T> BulkMerge <T>(this DbContext context, IEnumerable <T> entities, BulkMergeOptions <T> options)
{
int rowsAffected = 0;
var outputRows = new List <BulkMergeOutputRow <T> >();
var tableMapping = context.GetTableMapping(typeof(T));
var dbConnection = context.GetSqlConnection();
int rowsInserted = 0;
int rowsUpdated = 0;
int rowsDeleted = 0;
if (dbConnection.State == ConnectionState.Closed)
{
dbConnection.Open();
}
using (var transaction = dbConnection.BeginTransaction())
{
try
{
string stagingTableName = GetStagingTableName(tableMapping, options.UsePermanentTable, dbConnection);
string destinationTableName = string.Format("[{0}].[{1}]", tableMapping.Schema, tableMapping.TableName);
string[] columnNames = tableMapping.GetNonValueGeneratedColumns().ToArray();
string[] storeGeneratedColumnNames = tableMapping.GetPrimaryKeyColumns().ToArray();
SqlUtil.CloneTable(destinationTableName, stagingTableName, null, dbConnection, transaction, Common.Constants.Guid_ColumnName);
var bulkInsertResult = BulkInsert(entities, options, tableMapping, dbConnection, transaction, stagingTableName, null, SqlBulkCopyOptions.KeepIdentity, true);
IEnumerable <string> columnsToInsert = columnNames.Where(o => !options.GetIgnoreColumnsOnInsert().Contains(o));
IEnumerable <string> columnstoUpdate = columnNames.Where(o => !options.GetIgnoreColumnsOnUpdate().Contains(o)).Select(o => string.Format("t.{0}=s.{0}", o));
List <string> columnsToOutput = new List <string> {
"$Action", string.Format("{0}.{1}", "s", Constants.Guid_ColumnName)
};
List <PropertyInfo> propertySetters = new List <PropertyInfo>();
Type entityType = typeof(T);
foreach (var storeGeneratedColumnName in storeGeneratedColumnNames)
{
//columnsToOutput.Add(string.Format("deleted.[{0}]", storeGeneratedColumnName)); Not Yet Supported
columnsToOutput.Add(string.Format("inserted.[{0}]", storeGeneratedColumnName));
propertySetters.Add(entityType.GetProperty(storeGeneratedColumnName));
}
string mergeSqlText = string.Format("MERGE {0} t USING {1} s ON ({2}) WHEN NOT MATCHED BY TARGET THEN INSERT ({3}) VALUES ({3}) WHEN MATCHED THEN UPDATE SET {4} OUTPUT {5};",
destinationTableName, stagingTableName, options.MergeOnCondition.ToSqlPredicate("s", "t"),
SqlUtil.ConvertToColumnString(columnsToInsert),
SqlUtil.ConvertToColumnString(columnstoUpdate),
SqlUtil.ConvertToColumnString(columnsToOutput)
);
var bulkQueryResult = context.BulkQuery(mergeSqlText, dbConnection, transaction);
rowsAffected = bulkQueryResult.RowsAffected;
//var entitiesEnumerator = entities.GetEnumerator();
//entitiesEnumerator.MoveNext();
foreach (var result in bulkQueryResult.Results)
{
string action = (string)result[0];
int id = (int)result[1];
var entity = bulkInsertResult.EntityMap[id];
outputRows.Add(new BulkMergeOutputRow <T>(action, entity));
if (options.AutoMapOutputIdentity && entity != null)
{
for (int i = 2; i < result.Length; i++)
{
propertySetters[0].SetValue(entity, result[i]);
}
}
if (action == SqlMergeAction.Insert)
{
rowsInserted++;
}
else if (action == SqlMergeAction.Update)
{
rowsUpdated++;
}
else if (action == SqlMergeAction.Detete)
{
rowsDeleted++;
}
}
SqlUtil.DeleteTable(stagingTableName, dbConnection, transaction);
//ClearEntityStateToUnchanged(context, entities);
transaction.Commit();
}
catch (Exception ex)
{
transaction.Rollback();
throw ex;
}
finally
{
dbConnection.Close();
}
return(new BulkMergeResult <T>
{
Output = outputRows,
RowsAffected = rowsAffected,
RowsDeleted = rowsDeleted,
RowsInserted = rowsInserted,
RowsUpdated = rowsUpdated,
});
}
}
