public static int BulkInsert <T>(this DbContext context, IEnumerable <T> entities, BulkInsertOptions <T> options)
{
int rowsAffected = 0;
var tableMapping = context.GetTableMapping(typeof(T));
using (var dbTransactionContext = new DbTransactionContext(context))
{
try
{
var dbConnection = dbTransactionContext.Connection;
var transaction = dbTransactionContext.CurrentTransaction;
string stagingTableName = CommonUtil.GetStagingTableName(tableMapping, options.UsePermanentTable, dbConnection);
string destinationTableName = string.Format("[{0}].[{1}]", tableMapping.Schema, tableMapping.TableName);
IEnumerable <string> columnNames = options.InputColumns != null?options.InputColumns.GetObjectProperties() : tableMapping.GetColumns(options.KeepIdentity);
columnNames = columnNames.Where(o => !options.IgnoreColumns.GetObjectProperties().Contains(o));
string[] storeGeneratedColumnNames = tableMapping.GetPrimaryKeyColumns().ToArray();
IEnumerable <string> columnsToInsert = CommonUtil.FormatColumns(columnNames);
columnNames = columnNames.Union(storeGeneratedColumnNames);
context.Database.CloneTable(destinationTableName, stagingTableName, columnNames, Common.Constants.InternalId_ColumnName);
var bulkInsertResult = BulkInsert(entities, options, tableMapping, dbConnection, transaction, stagingTableName, columnNames, SqlBulkCopyOptions.KeepIdentity, true);
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));
propertySetters.Add(entityType.GetProperty(storeGeneratedColumnName));
}
string insertSqlText = string.Format("MERGE {0} t USING {1} s ON {2} WHEN NOT MATCHED THEN INSERT ({3}) VALUES ({3}){4};",
destinationTableName,
stagingTableName,
options.InsertIfNotExists ? CommonUtil <T> .GetJoinConditionSql(options.InsertOnCondition, storeGeneratedColumnNames, "t", "s") : "1=2",
SqlUtil.ConvertToColumnString(columnsToInsert),
columnsToOutput.Count > 0 ? " OUTPUT " + SqlUtil.ConvertToColumnString(columnsToOutput) : "");
if (options.KeepIdentity && storeGeneratedColumnNames.Length > 0)
{
context.Database.ToggleIdentityInsert(true, destinationTableName);
}
var bulkQueryResult = context.BulkQuery(insertSqlText, dbConnection, transaction, options);
if (options.KeepIdentity && storeGeneratedColumnNames.Length > 0)
{
context.Database.ToggleIdentityInsert(false, destinationTableName);
}
rowsAffected = bulkQueryResult.RowsAffected;
if (options.AutoMapOutputIdentity)
{
if (rowsAffected == entities.Count())
{
foreach (var result in bulkQueryResult.Results)
{
int entityId = (int)result[1];
var entity = bulkInsertResult.EntityMap[entityId];
for (int i = 2; i < columnsToOutput.Count; i++)
{
propertySetters[2 - i].SetValue(entity, result[i]);
}
}
}
}
context.Database.DropTable(stagingTableName);
//ClearEntityStateToUnchanged(context, entities);
dbTransactionContext.Commit();
return(rowsAffected);
}
catch (Exception ex)
{
dbTransactionContext.Rollback();
throw;
}
}
}
public static int BulkInsert <T>(this DbContext context, IEnumerable <T> entities, BulkInsertOptions <T> options)
{
int rowsAffected = 0;
var tableMapping = context.GetTableMapping(typeof(T));
var dbConnection = context.GetSqlConnection();
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.GetColumns(options.KeepIdentity);
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;
List <string> columnsToOutput = new List <string>();
List <PropertyInfo> propertySetters = new List <PropertyInfo>();
Type entityType = typeof(T);
foreach (var storeGeneratedColumnName in storeGeneratedColumnNames)
{
columnsToOutput.Add(string.Format("inserted.[{0}]", storeGeneratedColumnName));
propertySetters.Add(entityType.GetProperty(storeGeneratedColumnName));
}
string mergeSqlText = string.Format("INSERT INTO {0} ({1}) OUTPUT {2} SELECT {3} FROM {4};",
destinationTableName, SqlUtil.ConvertToColumnString(columnsToInsert), SqlUtil.ConvertToColumnString(columnsToOutput), SqlUtil.ConvertToColumnString(columnsToInsert), stagingTableName);
if (options.KeepIdentity)
{
SqlUtil.ToggleIdentiyInsert(true, destinationTableName, dbConnection, transaction);
}
var bulkQueryResult = context.BulkQuery(mergeSqlText, dbConnection, transaction);
if (options.KeepIdentity)
{
SqlUtil.ToggleIdentiyInsert(false, destinationTableName, dbConnection, transaction);
}
rowsAffected = bulkQueryResult.RowsAffected;
if (options.AutoMapOutputIdentity)
{
if (rowsAffected == entities.Count())
{
var entityIndex = 1;
foreach (var result in bulkQueryResult.Results)
{
var entity = bulkInsertResult.EntityMap[entityIndex];
propertySetters[0].SetValue(entity, result[0]);
entityIndex++;
}
}
}
SqlUtil.DeleteTable(stagingTableName, dbConnection, transaction);
//ClearEntityStateToUnchanged(context, entities);
transaction.Commit();
return(rowsAffected);
}
catch (Exception ex)
{
transaction.Rollback();
throw ex;
}
finally
{
dbConnection.Close();
}
}
}
