参数化查询与%

Question

我有一个选择声明

command.commandText = "SELECT FIRSTNAME, LASTNAME FROM MYTABLE" +
                      " WHERE STATE LIKE @STATE + '%';";

这给了我一个"'"错误

我试过这个

command.commandText = "SELECT FIRSTNAME, LASTNAME FROM MYTABLE" +
                      " WHERE STATE LIKE @STATE" + "'%';";

这给了'%'错误......正确的方法是什么

Answer 1

您必须在实际参数值中添加%,而不是在查询中:

command.commandText = "SELECT FIRSTNAME, LASTNAME FROM MYTABLE WHERE STATE LIKE @STATE";
command.Parameters.AddWithValue("STATE", "CALI%");

valState例如,如果您在字符串中保存了一些值,则只需附加%到AddWithValue:

string valState = "Cali";
// ...
command.Parameters.AddWithValue("STATE", valState + "%");