如何在eclipse中配置javadb？ [英] How to configure javadb in eclipse?

问题描述

我试过一个关于数据库的简单代码，但它给我这个错误 - >错误：没有找到适合的驱动程序jdbc：derby：CoffeeDB; create = true

package Practice;
import java.sql.*;

public class Practice {
public static void main(String[]args)throws Exception{
    final String DB_URL = "jdbc:derby:CoffeeDB;create=true";
    try{
        Connection conn = DriverManager.getConnection(DB_URL);
        Statement stmt = conn.createStatement();

        String sql = ("CREATE TABLE Coffee(Description CHAR(25),Prod Num CHAR(10) NOT NULL PRIMARY KEY,Price DOUBLE)");
        stmt.execute(sql);

        sql = "INSERT INTO Coffee VALUES('Bolivian Dark','14-001',8.95)";
        stmt.executeUpdate(sql);

        sql = "INSERT INTO Coffee VALUES('Bolivian Medium','14-002',8.95)";
        stmt.executeUpdate(sql);

        sql = "INSERT INTO Coffee VALUES('Brazilian Dark','15-001',7.95)";
        stmt.executeUpdate(sql);

        sql = "INSERT INTO Coffee VALUES('Brazilian Medium','15-002',7.95)";
        stmt.executeUpdate(sql);

        sql = "INSERT INTO Coffee VALUES('Brazilian Decaf','15-003',8.55)";
        stmt.executeUpdate(sql);

        sql = "INSERT INTO Coffee VALUES('Central American Dark','16-001',9.95)";
        stmt.executeUpdate(sql);

        sql = "INSERT INTO Coffee VALUES('Central American Medium','16-002',9.95)";
        stmt.executeUpdate(sql);

        sql = "INSERT INTO Coffee VALUES('Sumatra Dark','17-001',7.95)";
        stmt.executeUpdate(sql);

        sql = "INSERT INTO Coffee VALUES('Sumatra Decaf','17-002',8.95)";
        stmt.executeUpdate(sql);

        sql = "INSERT INTO Coffee VALUES('Sumatra Medium','17-003',7.95)";
        stmt.executeUpdate(sql);

        sql = "INSERT INTO Coffee VALUES('Sumatra Organic Dark','17-004',11.95)";
        stmt.executeUpdate(sql);

        sql = "INSERT INTO Coffee VALUES('Kona Medium','18-001',18.45)";
        stmt.executeUpdate(sql);

        sql = "INSERT INTO Coffee VALUES('Kona Dark','18-002',18.45)";
        stmt.executeUpdate(sql);

        sql = "INSERT INTO Coffee VALUES('French Roast Dark','19-001',9.65)";
        stmt.executeUpdate(sql);

        sql = "INSERT INTO Coffee VALUES('Galapagos Medium','20-001',6.85)";
        stmt.executeUpdate(sql);

        sql = "INSERT INTO Coffee VALUES('Guatemalan Dark','21-001',9.95)";
        stmt.executeUpdate(sql);

        sql = "INSERT INTO Coffee VALUES('Guatemalan Decaf','21-002',10.45)";
        stmt.executeUpdate(sql);

        sql = "INSERT INTO Coffee VALUES('Guatemalan Medium','21-003',9.95)";
        stmt.executeUpdate(sql);

        String sqlStatement = "SELECT Description FROM Coffee";
        ResultSet result = stmt.executeQuery(sqlStatement);

        System.out.println("Coffees found in the Database");
        System.out.println("-----------------------------");

        while(result.next()){
            System.out.println(result.getString("Description"));
        }

        conn.close();
    }catch(Exception ex){
        System.out.println("ERROR: " + ex.getMessage());
    }
}
}

我一步一步的如何配置这个过程？

推荐答案

1. Download the driver Derby driver, if I remeber correcly it is the derby.jar (add it to class path)

在连接注册驱动程序之前

Before connecting register the driver

Driver driver =  (Driver) Class.forName("org.apache.derby.jdbc.EmbeddedDriver")
.newInstance();

DriverManager.registerDriver(driver);

metodo抛出Class.forName异常

You need to do try catch or have your metodo throw the Class.forName exception

更多信息，请查看 SQLException：找不到适用于jdbc：derby：// localhost：1527的驱动程序

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