无效的列名异常，即使存在列也是如此

Question

当我尝试使用此查询访问数据库时，出现错误

invalid column name 'sandeep' which is the name of the patient ie itemArray[3]  

码：

case "patient":
string queryPatientCheck = @"select * 
                             from patient
                             where 
                             [patientID]={0} and
                             [patientName]={1}";

queryPatientCheck = string.Format(queryPatientCheck, itemArray[2], itemArray[3]);

Answer 1

好你的SQL翻译成这个

select * 
                             from patient
                             where 
                             [patientID]={0} and
                             [patientName]=sandeep

在这种情况下，它将搜索名为sandeep的列。 您想要的是字符串sandeep，即'sandeep'

select * 
                             from patient
                             where 
                             [patientID]={0} and
                             [patientName]='sandeep'