Du borde få NPE. När du kör din fråga på dbCon
och inte på dbcon
// initialize here
Connection dbcon = DriverManager.getConnection(
"jdbc:mysql://localhost:3306/EMPLOYEE", "root", "root");
String query ="select count(*) from EMPLOYEE4 ";
// Null here
Connection dbCon = null;
// on dbCon which is null
stmt = dbCon.prepareStatement(query);
REDIGERA
Så här ska din kod se ut.
Connection dbcon = DriverManager.getConnection(
"jdbc:mysql://localhost:3306/EMPLOYEE", "root", "root");
String query = "select count(*) from EMPLOYEE4 ";
Statement stmt = dbcon.createStatement();
ResultSet rs = stmt.executeQuery(query);