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我試圖做一些querys到我創建了一個數據庫,但我有連接到它的問題:SQLite數據庫連接問題的Java
enter code here import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class GestorBase{
private ResultSet resultset;
private static Connection con;
private Statement sentencia;
public static void main(String[] args) throws SQLException, ClassNotFoundException{
Class.forName("org.sqlite.JDBC");
try {
con=DriverManager.getConnection("jdbc:sqlite:db/Freepark.sqlite");
} catch (SQLException e) {
System.out.println("error al buscar la base de datos");
}
Statement sentencia = con.createStatement();
String query = "SELECT * FROM Restaurantes";
ResultSet resultset = sentencia.executeQuery(query);
while(resultset.next())
{
String nombre = resultset.getString("NOMBRE");
String calle = resultset.getString("CALLE");
int codigo = resultset.getInt("CODIGO");
System.out.println("Codigo de restaurante: "+codigo+"Nombre de restaurante: "+ nombre +"
Calle del restaurante: "+ calle);
}
}
}
而我得到的控制檯消息是:
error al buscar la base de datos
Exception in thread "main" java.lang.NullPointerException
at GestorBase.main(GestorBase.java:27)
第27行是「語句sentencia = con.createStatement();」一個,所以我想這就是那個空指針異常生成器?但是我也得到了「錯誤的基礎數據庫」消息,女巫是catch塊內的一個,這意味着「語句sentencia = con.createStatement();」行太對了?任何人?:_
我已刪除try catch塊,現在我得到這個在控制檯: – Robert13 2010-12-06 22:44:13