使用MySqlCommand在一个查询中执行多个INSERT
本文关键字:查询 执行 INSERT 一个 MySqlCommand 使用 | 更新日期: 2023-09-27 18:00:37
我正在使用以下代码:
string cmd = "INSERT INTO " + Tables.Lux() + " VALUES(NULL, @Position, @Mode, @Timer)";
try
{
using (var MyConnection = new MySqlConnection(ConfigurationManager.ConnectionStrings["DataFormConnection"].ConnectionString))
{
using (MySqlCommand command = new MySqlCommand(cmd, MyConnection))
{
MyConnection.Open();
command.Parameters.Add(new MySqlParameter("Position", Element.Position));
command.Parameters.Add(new MySqlParameter("Mode", Element.Mode));
command.Parameters.Add(new MySqlParameter("Timer", Element.Timer));
command.ExecuteNonQuery();
}
}
}
我正在使用上面的代码插入包含100个项目的Element列表中的数据。我只想在一个查询中添加100个值,我知道SQL语句看起来像:
INSERT INTO table (a,b) VALUES (1,2), (2,3), (3,4);
但我不知道如何使用CCD_ 1方法来应用该结构。
我的目标是传递这个函数List<Element>
,而不仅仅是Element
,并创建一个INSERT
语句,其中包含列表中的所有项,只在一个查询中执行。请帮忙吗?
谢谢。
这样试试:
string cmd = "INSERT INTO " + Tables.Lux() + " VALUES ";
int counter = 0;
foreach (Element e in list)
{
sql += "(NULL, @Position" + counter + ", @Mode" + counter + ", @Timer" + counter + "),";
command.Parameters.Add(new MySqlParameter("Position" + counter, e.Position));
command.Parameters.Add(new MySqlParameter("Mode" + counter, e.Mode));
command.Parameters.Add(new MySqlParameter("Timer" + counter, e.Timer));
counter++;
}
command.CommandText = sql.Substring(0, sql.Length-1); //Remove ',' at the end
通过这种方式,您可以在查询中拥有可变数量的参数,并且您只需要对数据库触发一次,而不是n次
这是未经测试的,我简直想不到!
我使用@异种生成答案来解决我的问题,也许可以帮助其他人
List<EntregadorRPC.Address> addresstoinsert = eoSendAddressList.addresses;
int batteryLvl = eoSendAddressList.batteryLevel;
DateTime dtHoraLocal;
int size = addresstoinsert.Count;
const string insertHeader = "Insert into historicolocalizacao (Provedor, CodUsuario, Latitude, Longitude, Precisao, Logradouro, " +
"Complemento, Setor, Cidade, UF, Cep, DataHoraLocal, bateria) Values";
StringBuilder insertValues = new StringBuilder("");
using (MySqlCommand cmd = new MySqlCommand()) {
for (int i = 0; i < size; i++) {
EntregadorRPC.Address address = addresstoinsert[i];
dtHoraLocal = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
dtHoraLocal = dtHoraLocal.AddMilliseconds(address.dataHoraLocal).ToLocalTime();
/*address.logradouro = WSUtils.RemoveSpecialCharacters(address.logradouro);
address.formattedAddress = WSUtils.RemoveSpecialCharacters(address.formattedAddress);*/
cmd.Parameters.AddWithValue($"@provedor{i}", address.provedor);
cmd.Parameters.AddWithValue($"@user_id{i}", user.user_id);
cmd.Parameters.AddWithValue($"@latitude{i}", address.latitude);
cmd.Parameters.AddWithValue($"@longitude{i}", address.longitude);
cmd.Parameters.AddWithValue($"@precisao{i}", address.precisao);
cmd.Parameters.AddWithValue($"@logradouro{i}", address.logradouro);
cmd.Parameters.AddWithValue($"@complemento{i}", address.complemento);
cmd.Parameters.AddWithValue($"@setor{i}", address.setor);
cmd.Parameters.AddWithValue($"@cidade{i}", address.cidade);
cmd.Parameters.AddWithValue($"@uf{i}", address.uf);
cmd.Parameters.AddWithValue($"@cep{i}", address.cep);
cmd.Parameters.AddWithValue($"@datahoralocal{i}", dtHoraLocal.ToString("yyyy-MM-dd HH:mm:ss"));
cmd.Parameters.AddWithValue($"@bateria{i}", batteryLvl);
insertValues.Append($"(@provedor{i}, @user_id{i}, @latitude{i}, @longitude{i}, @precisao{i}, @logradouro{i}, @complemento{i}, @setor{i}, @cidade{i}, @uf{i}, @cep{i}, @datahoralocal{i}, @bateria{i})");
if (i < size - 1) {
insertValues.Append(",");
}
}
cmd.Connection = conn;
cmd.CommandText = $"{insertHeader}{insertValues}";
await cmd.ExecuteNonQueryAsync();
}