private string ResovleBatchInsert(IEnumerable <T> entitys)
{
var table = DbMetaInfoCache.GetTable(typeof(T)).TableName;
var filters = new GroupExpressionResovle(_filterExpression).Resovle().Split(',');
var columns = DbMetaInfoCache.GetColumns(typeof(T))
.Where(a => !a.IsComplexType).ToList();
var intcolumns = columns
.Where(a => !filters.Contains(a.ColumnName) && !a.IsNotMapped && !a.IsIdentity)
.ToList();
var columnNames = string.Join(",", intcolumns.Select(s => s.ColumnName));
if (_context.DbContextType == DbContextType.Mysql)
{
var buffer = new StringBuilder();
buffer.Append($"INSERT INTO {table}({columnNames}) VALUES ");
var serializer = TypeConvert.GetDeserializer(typeof(T));
var list = entitys.ToList();
for (var i = 0; i < list.Count; i++)
{
var item = list[i];
var values = serializer(item);
buffer.Append("(");
for (var j = 0; j < intcolumns.Count; j++)
{
var column = intcolumns[j];
var value = values[column.CsharpName];
if (value == null)
{
buffer.Append(column.IsDefault ? "DEFAULT" : "NULL");
}
else if (column.CsharpType == typeof(bool) || column.CsharpType == typeof(bool?))
{
buffer.Append(Convert.ToBoolean(value) == true ? 1 : 0);
}
else if (column.CsharpType == typeof(DateTime) || column.CsharpType == typeof(DateTime?))
{
buffer.Append($"'{value}'");
}
else if (column.CsharpType == typeof(JsonElement) || column.CsharpType == typeof(JsonElement?))
{
buffer.Append($"'{value}'");
}
else if (column.CsharpType.IsValueType || (Nullable.GetUnderlyingType(column.CsharpType)?.IsValueType == true))
{
buffer.Append(value);
}
else
{
var str = SqlEncoding(value.ToString());
buffer.Append($"'{str}'");
}
if (j + 1 < intcolumns.Count)
{
buffer.Append(",");
}
}
buffer.Append(")");
if (i + 1 < list.Count)
{
buffer.Append(",");
}
}
return(buffer.Remove(buffer.Length - 1, 0).ToString());
}
throw new NotImplementedException();
}