使用java程序连接到java DB
使用java程序连接到java DB
提问于 2013-02-24 22:56:19
我正在实现一个简单的教程，
使用NetBeans 7集成开发环境将java程序连接到java DB。这里是教程的链接。
http://www.homeandlearn.co.uk/java/connect_to_a_database_using_java_code.html但是当我运行这个项目时，NetBeans给了我以下错误：
run:
java.lang.VerifyError: Constructor must call super() or this() before return in method database_console.DBConnect.<init>()V at offset 0
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2442)
at java.lang.Class.getMethod0(Class.java:2685)
at java.lang.Class.getMethod(Class.java:1620)
at sun.launcher.LauncherHelper.getMainMethod(LauncherHelper.java:492)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:484)
Exception in thread "main" Java Result: 1
BUILD SUCCESSFUL (total time: 12 seconds)以下是该项目的代码
package database_console;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public static void main(String[] args) {
try {
String host = "jdbc:derby://localhost:1527/Employees";
String uName="faisal";
String uPass="password";
Connection con=DriverManager.getConnection(host, uName, uPass);
}
catch ( SQLException err ) {
System.out.println( err.getMessage( ) );
}
}
}解决这个问题的任何可用的建议
回答 4
Stack Overflow用户
回答已采纳
发布于 2013-02-24 23:07:59
您没有正确遵循您链接的tutorial。
您的代码应如下所示：
package database_console;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class DBConnect { // <--- This is missing from your code
public static void main(String[] args) {
try {
String host = "jdbc:derby://localhost:1527/Employees";
String uName = "faisal";
String uPass = "password";
Connection con = DriverManager.getConnection(host, uName, uPass);
} catch (SQLException err) {
System.out.println(err.getMessage());
}
} // <--- This is also missing from your code
}并且它应该在database_console包中的DBConnect.java文件中
Stack Overflow用户
发布于 2013-02-24 22:59:29
如果上面的代码是您正在使用的代码，那么您需要将整个代码放入类中。
//Package declarations (if any)
//Import packages
public class className {
public static void main(String[] args) {
//Other code
}
}Stack Overflow用户
发布于 2013-02-24 23:09:31
请将class添加到main()中。像下面这样
package database_console;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class DBConnect
{
public static void main(String[] args)
{
try
{
String host = "jdbc:derby://localhost:1527/Employees";
String uName = "faisal";
String uPass = "password";
Connection con = DriverManager.getConnection(host, uName, uPass);
}
catch (SQLException err)
{
System.out.println(err.getMessage());
}
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/15052950
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