Mysql一次更新多條數據

 

根據不同的ID更新ID對應條的Code,Name,Value,Type：

string updateSqlString = " update serverconfigdata set ";
string updateSqlCode = " Code = CASE ID ";
string updateSqlName = " Name = CASE ID ";
string updateSqlValue = " Value = CASE ID ";
string updateSqlType = " Type = CASE ID ";

foreach (ServerConfigData sc in scList)
{
if(!string.IsNullOrEmpty(sc.ID))
{
//updateSqlString = $" update tablename set Code = '{sc.Code}',Name = '{sc.Name}',Value = '{sc.Value}',Type = '{sc.Type}' where Code = '{sc.Code}'; ";
//DataTable updatedt = mySQLConn.ExecuteDataTable(updateSqlString);
updateSqlCode += $" When {sc.ID} Then '{sc.Code}' ";
updateSqlName += $" When {sc.ID} Then '{sc.Name}' ";
updateSqlValue += $" When {sc.ID} Then '{sc.Value}' ";
updateSqlType += $" When {sc.ID} Then '{sc.Type}' ";

updateIDS += $"{sc.ID},";
}
else
{
insertSqlDatas += $" ('{sc.Code}','{sc.Name}','{sc.Value}','{sc.Type}'),";
}
}
updateSqlCode += " END ";
updateSqlName += " END ";
updateSqlValue += " END ";
updateSqlType += " END ";