我正在尝试学习连接到oracle数据库当我以这种方式登录 sqlplus 时：sqlplus sys/Oracle_1@orcl as sysdba;我运行这段代码：connect hr/hr@orclpdbselect count(*) from employees;我得到这个输出： COUNT(*)---------- 107但是当我尝试在 java 代码中访问该表时，出现此错误：ORA-00942: table or view does not exist这是我的java代码：class OracleCon{ public static void main(String args[]){ try{ Class.forName("oracle.jdbc.driver.OracleDriver"); Connection con=DriverManager.getConnection( "jdbc:oracle:thin:hr/hr@localhost:1521/orclpdb","sys as sysdba","Oracle_1"); Statement stmt=con.createStatement(); ResultSet rs=stmt.executeQuery("select count(*) from employees"); while(rs.next()) System.out.println(rs.getInt(1)+" "+rs.getString(2)+" "+rs.getString(3)); con.close(); }catch(Exception e){ System.out.println(e);} } } 我应该怎么做才能解决这个问题？
2 回答
斯蒂芬大帝
TA贡献1827条经验 获得超8个赞
您正在尝试使用 java 代码中的用户连接它sys，但表employee存在于hr架构中。
您可以更改：
//Change this line from
Connection con=DriverManager.getConnection(
"jdbc:oracle:thin:hr/hr@localhost:1521/orclpdb","sys as sysdba","Oracle_1");
// to
Connection con=DriverManager.getConnection(
"jdbc:oracle:thin:hr/hr@localhost:1521/orclpdb","hr","hr");
或者
您可以更改从表中获取数据的方式employee（使用其架构查询表）
//Change this line from
ResultSet rs=stmt.executeQuery("select count(*) from employees");
//to
ResultSet rs=stmt.executeQuery("select count(*) from hr.employees");
干杯！！
幕布斯7119047
TA贡献1794条经验 获得超8个赞
请尝试一下这段代码。它必须工作
public static void conn() throws ClassNotFoundException, SQLException{
Connection con=DriverManager.getConnection(
"jdbc:oracle:thin:@localhost:1521:orclpdb", "HR", "HR");
Statement stmt=con.createStatement();
ResultSet rs=stmt.executeQuery("select count(*) from dual");
while(rs.next())
System.out.println(rs.getInt(1));
con.close();
}
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