java 连接 oracle报错。“java.lang.Error”,该怎么解决
日期：2014-05-20 浏览次数：20921 次
java 连接 oracle报错。“java.lang.Error”
不知道为什么，运行时提示这里有错误，搞了半天也搞不好，
//得到连接
Connection ct=DriverManager.getConnection("jdbc:odbc:testsp","scott","123");
运行时提示：
Exception in thread "main" java.lang.Error: Unresolved compilation problem:
The method getConnection(String, String, String) is undefined for the type DriverManager
package com.sp;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
public class testora {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
try {
//加载驱动
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
//得到连接
Connection ct=DriverManager.getConnection("jdbc:odbc:testsp","scott","123");
//从下面开始和sql server 一模一样
Statement sm=ct.createStatement();
ResultSet rs=sm.executeQuery("select * from emp");
while(rs.next()){
//用户名
System.out.println("用户名 : "+rs.getString(1));
}
}catch (Exception e){
e.printStackTrace();
//TODO: handle exception
}
}
}
------解决方案--------------------
import java.sql.DriverManager ;
没有把类引用进来， 难道你能编译过去不报错 ？
------解决方案--------------------
不知道为什么，运行时提示这里有错误，搞了半天也搞不好，
//得到连接
Connection ct=DriverManager.getConnection("jdbc:odbc:testsp","scott","123");
运行时提示：
Exception in thread "main" java.lang.Error: Unresolved compilation problem:
The method getConnection(String, String, String) is undefined for the type DriverManager
package com.sp;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
public class testora {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
try {
//加载驱动
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
//得到连接
Connection ct=DriverManager.getConnection("jdbc:odbc:testsp","scott","123");
//从下面开始和sql server 一模一样
Statement sm=ct.createStatement();
ResultSet rs=sm.executeQuery("select * from emp");
while(rs.next()){
//用户名
System.out.println("用户名 : "+rs.getString(1));
}
}catch (Exception e){
e.printStackTrace();
//TODO: handle exception
}
}
}
------解决方案--------------------
import java.sql.DriverManager ;
没有把类引用进来， 难道你能编译过去不报错 ？
------解决方案--------------------
- Java code
package com.sp;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.sql.DriverManager ;
public class TestOra {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
try {
//加载驱动
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
//得到连接
Connection ct=DriverManager.getConnection("jdbc:odbc:testsp","scott","123");
//从下面开始和sql server 一模一样
Statement sm=ct.createStatement();
ResultSet rs=sm.executeQuery("select * from emp");
while(rs.next()){
//用户名
System.out.println("用户名 : "+rs.getString(1));
}
}catch (Exception e){
e.printStackTrace();
//TODO: handle exception
}
}
}
------解决方案--------------------
我连接成功的例子：- Java code
<%@ page contentType="text/html;charset=GB2312"%>
<%@ import="java.sql.*"%>
<html><body>
<%
Connection con =null;
Statement sql = null;
ResultSet rs = null;
try{
Class.forName("oracle.jdbc.driver.OracleDriver");
}catch(ClassNotFoundException e){
}
try{
con = DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:","scott","tiger");
sql = con.createStatement();
rs = sql.executeQuery("select * from emp");
out.print("<table border>");
out.print("<tr>");
out.print("<th width=100>"+"empno");
out.print("<th width=100>"+"ename");
out.print("</tr>");
while(rs.next()){
out.print("<tr>");
int n = rs.getInt(1);
out.print("<td>" + n + "</td>");
int e = rs.getInt(2);
out.print("<td>" + e + "</td>");
out.print("<tr>");
}
out.print("</table>");
con.close();
}catch(SQLException e){
out.print(" "+e);
}
%>
</body></html>
------解决方案--------------------
- Java code
<%@ page contentType="text/html;charset=GB2312"%>
<%@ import="java.sql.*"%>
<html><body>
<%
Connection con =null;
Statement sql = null;
ResultSet rs = null;
try{
Class.forName("oracle.jdbc.driver.OracleDriver");
}catch(ClassNotFoundException e){
}
try{
con = DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:这里是数据库名字","scott","tiger");
sql = con.createStatement();
rs = sql.executeQuery("select * from emp");
out.print("<table border>");
out.print("<tr>");
out.print("<th width=100>"+"empno");
out.print("<th width=100>"+"ename");
out.print("</tr>");
while(rs.next()){
out.print("<tr>");
int n = rs.getInt(1);
out.print("<td>" + n + "</td>");
int e = rs.getInt(2);
out.print("<td>" + e + "</td>");
out.print("<tr>");
}
out.print("</table>");
con.close();
}catch(SQLException e){
out.print(" "+e);
}
%>
</body></html>
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