System.Data.SQLite参数问题
我有以下代码:
try
{
//Create connection
SQLiteConnection conn = DBConnection.OpenDB();
//Verify user input, normally you give dbType a size, but Text is an exception
var uNavnParam = new SQLiteParameter("@uNavnParam", SqlDbType.Text) { Value = uNavn };
var bNavnParam = new SQLiteParameter("@bNavnParam", SqlDbType.Text) { Value = bNavn };
var passwdParam = new SQLiteParameter("@passwdParam", SqlDbType.Text) {Value = passwd};
var pc_idParam = new SQLiteParameter("@pc_idParam", SqlDbType.TinyInt) { Value = pc_id };
var noterParam = new SQLiteParameter("@noterParam", SqlDbType.Text) { Value = noter };
var licens_idParam = new SQLiteParameter("@licens_idParam", SqlDbType.TinyInt) { Value = licens_id };
var insertSQL = new SQLiteCommand("INSERT INTO Brugere (navn, brugernavn, password, pc_id, noter, licens_id)" +
"VALUES ('@uNameParam', '@bNavnParam', '@passwdParam', '@pc_idParam', '@noterParam', '@licens_idParam')", conn);
insertSQL.Parameters.Add(uNavnParam); //replace paramenter with verified userinput
insertSQL.Parameters.Add(bNavnParam);
insertSQL.Parameters.Add(passwdParam);
insertSQL.Parameters.Add(pc_idParam);
insertSQL.Parameters.Add(noterParam);
insertSQL.Parameters.Add(licens_idParam);
insertSQL.ExecuteNonQuery(); //Execute query
//Close connection
DBConnection.CloseDB(conn);
//Let the user know that it was changed succesfully
this.Text = "Succes! Changed!";
}
catch(SQLiteException e)
{
//Catch error
MessageBox.Show(e.ToString(), "ALARM");
}
它执行完美,但是当我查看“brugere”表时,它插入了值:“@uNameParam”、“@bNavnParam”、“@passwdParam”、“@pc_idParam”、“@noterParam” ,字面上的“@licens_idParam”。 而不是更换它们。
我尝试设置断点并检查参数,它们确实具有正确的分配值。 所以这也不是问题。
我现在已经对此进行了很多修改,但没有运气,有人可以帮忙吗?
哦,作为参考,这里是 DBConnection 类中的 OpenDB 方法:
public static SQLiteConnection OpenDB()
{
try
{
//Gets connectionstring from app.config
const string myConnectString = "data source=data;";
var conn = new SQLiteConnection(myConnectString);
conn.Open();
return conn;
}
catch (SQLiteException e)
{
MessageBox.Show(e.ToString(), "ALARM");
return null;
}
}
I have the following code:
try
{
//Create connection
SQLiteConnection conn = DBConnection.OpenDB();
//Verify user input, normally you give dbType a size, but Text is an exception
var uNavnParam = new SQLiteParameter("@uNavnParam", SqlDbType.Text) { Value = uNavn };
var bNavnParam = new SQLiteParameter("@bNavnParam", SqlDbType.Text) { Value = bNavn };
var passwdParam = new SQLiteParameter("@passwdParam", SqlDbType.Text) {Value = passwd};
var pc_idParam = new SQLiteParameter("@pc_idParam", SqlDbType.TinyInt) { Value = pc_id };
var noterParam = new SQLiteParameter("@noterParam", SqlDbType.Text) { Value = noter };
var licens_idParam = new SQLiteParameter("@licens_idParam", SqlDbType.TinyInt) { Value = licens_id };
var insertSQL = new SQLiteCommand("INSERT INTO Brugere (navn, brugernavn, password, pc_id, noter, licens_id)" +
"VALUES ('@uNameParam', '@bNavnParam', '@passwdParam', '@pc_idParam', '@noterParam', '@licens_idParam')", conn);
insertSQL.Parameters.Add(uNavnParam); //replace paramenter with verified userinput
insertSQL.Parameters.Add(bNavnParam);
insertSQL.Parameters.Add(passwdParam);
insertSQL.Parameters.Add(pc_idParam);
insertSQL.Parameters.Add(noterParam);
insertSQL.Parameters.Add(licens_idParam);
insertSQL.ExecuteNonQuery(); //Execute query
//Close connection
DBConnection.CloseDB(conn);
//Let the user know that it was changed succesfully
this.Text = "Succes! Changed!";
}
catch(SQLiteException e)
{
//Catch error
MessageBox.Show(e.ToString(), "ALARM");
}
It executes perfectly, but when I view my "brugere" table, it has inserted the values: '@uNameParam', '@bNavnParam', '@passwdParam', '@pc_idParam', '@noterParam', '@licens_idParam' literally. Instead of replacing them.
I have tried making a breakpoint and checked the parameters, they do have the correct assigned values. So that is not the issue either.
I have been tinkering with this a lot now, with no luck, can anyone help?
Oh and for reference, here is the OpenDB method from the DBConnection class:
public static SQLiteConnection OpenDB()
{
try
{
//Gets connectionstring from app.config
const string myConnectString = "data source=data;";
var conn = new SQLiteConnection(myConnectString);
conn.Open();
return conn;
}
catch (SQLiteException e)
{
MessageBox.Show(e.ToString(), "ALARM");
return null;
}
}
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您应该删除 INSERT 语句中参数名称周围的引号。
所以而不是
使用
You should remove the quotes around your parameter names in the INSERT statement.
So instead of
use
感谢 rwwilden 和 Jorge Villuendas,答案是:
Thanks to rwwilden and Jorge Villuendas, the answer is:
当您使用 System.Data.SqlClient 时,您可以通过 System.Data.SqlDbType 枚举提供参数类型。
但是如果您使用
System.Data.SQLite
,那么您必须使用**System.Data.DbType**
枚举。When you use
System.Data.SqlClient
then you provide parameter types fromSystem.Data.SqlDbType
enumeration.But if you use
System.Data.SQLite
then you have to use**System.Data.DbType**
enumeration.代替
与
replace
with