Exception- java.lang.NullPointerException java.sql.SQLException at com.internetcds.jdbc.tds.Constructors.newConnection(Constructors.java:305) at com.internetcds.jdbc.tds.Driver.connect(Driver.java:257) at java.sql.DriverManager.getConnection(DriverManager.java:517) at java.sql.DriverManager.getConnection(DriverManager.java:177) at SimpleQuery.performQuery(SimpleQuery.java:80) at SimpleQuery.main(SimpleQuery.java:39) 下面这一句不成功,抛出意外 con = DriverManager.getConnection(connectionURL,"sa","");
to tanghuan: 用户名和帐号是没错的。 con = DriverManager.getConnection(connectionURL,"sa",""); 哪里错??
to wbh001: 测试结果报异常: Exception- java.lang.NullPointerException null java.sql.SQLException at com.internetcds.jdbc.tds.Constructors.newConnection(Constructors.java:305) at com.internetcds.jdbc.tds.Driver.connect(Driver.java:257) at java.sql.DriverManager.getConnection(DriverManager.java:517) at java.sql.DriverManager.getConnection(DriverManager.java:177) at jdbcTest.main(jdbcTest.java:7) 请判断哪里出了问题!!
我就是这么作的呀!!!
java.sql.SQLException
at com.internetcds.jdbc.tds.Constructors.newConnection(Constructors.java:305)
at com.internetcds.jdbc.tds.Driver.connect(Driver.java:257)
at java.sql.DriverManager.getConnection(DriverManager.java:517)
at java.sql.DriverManager.getConnection(DriverManager.java:177)
at SimpleQuery.performQuery(SimpleQuery.java:80)
at SimpleQuery.main(SimpleQuery.java:39)
下面这一句不成功,抛出意外
con = DriverManager.getConnection(connectionURL,"sa","");
用户名和帐号是没错的。
con = DriverManager.getConnection(connectionURL,"sa","");
哪里错??
public static void main(String [] args){
try{
Class.forName(driverName);
Connection con=DriverManager.getConnection(url,user,password);
con.close();
System.out.println("success");
}catch(Exception e){System.out.println(e.getMessage());
e.printStackTrace();
}}
测试结果报异常:
Exception- java.lang.NullPointerException
null
java.sql.SQLException
at com.internetcds.jdbc.tds.Constructors.newConnection(Constructors.java:305)
at com.internetcds.jdbc.tds.Driver.connect(Driver.java:257)
at java.sql.DriverManager.getConnection(DriverManager.java:517)
at java.sql.DriverManager.getConnection(DriverManager.java:177)
at jdbcTest.main(jdbcTest.java:7) 请判断哪里出了问题!!