[英]android with JDBC. createStatement() does not exist?
我試圖在我的android項目上使用JDBC創建與數據庫的連接。 我正在遵循一個教程,該教程說要導入一個jar,然后在活動中創建一個連接。 一切正常,但是在連接語句中出現錯誤
無法解析方法“ createStatement()”
如果我嘗試進入該方法的參考,它說
找不到要去的地方
這種方法來自我進口的罐子嗎? (jtds-1.3.1)我在這里還想念什么嗎?
@Override
protected String doInBackground(String... params)
{
Connection con;
String usernam = params[0];
String passwordd = params[1];
if(usernam.trim().equals("")|| passwordd.trim().equals(""))
z = "Please enter Username and Password";
else
{
try
{
con = connectionclass(un, pass, db, ip); // Connect to database
if (con == null)
{
z = "Check Your Internet Access!";
}
else
{
// Change below query according to your own database.
String query = "select * from owner where mail = '" + usernam.toString() + "' and password = '"+ passwordd.toString() +"' ";
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery(query);
if(rs.next())
{
z = "Login successful";
isSuccess=true;
con.close();
}
else
{
z = "Invalid Credentials!";
isSuccess = false;
}
}
}
catch (Exception ex)
{
isSuccess = false;
z = ex.getMessage();
}
}
return z;
}
}
@SuppressLint("NewApi")
public Connection connectionclass(String user, String password, String database, String server)
{
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
Connection connection = null;
String ConnectionURL = null;
try
{
Class.forName("net.sourceforge.jtds.jdbc.Driver");
ConnectionURL = "jdbc:jtds:sqlserver://" + server + database + ";user=" + user+ ";password=" + password + ";";
connection = (Connection) DriverManager.getConnection(ConnectionURL);
}
catch (SQLException se)
{
Log.e("error here 1 : ", se.getMessage());
}
catch (ClassNotFoundException e)
{
Log.e("error here 2 : ", e.getMessage());
}
catch (Exception e)
{
Log.e("error here 3 : ", e.getMessage());
}
return connection;
}
您要做的就是完全指定類名稱:
java.sql.Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/product","root","");
不需要強制轉換,並且您報告的錯誤現在將消失,因為編譯器將在正確的類中尋找方法。
或者只是重命名自己的類Connection
。
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