我正在嘗試學習連接到oracle數據庫當我以這種方式登錄 sqlplus 時：sqlplus sys/Oracle_1@orcl as sysdba;我運行這段代碼：connect hr/hr@orclpdbselect count(*) from employees;我得到這個輸出： COUNT(*)---------- 107但是當我嘗試在 java 代碼中訪問該表時，出現此錯誤：ORA-00942: table or view does not exist這是我的java代碼：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);} } } 我應該怎么做才能解決這個問題？
2 回答
斯蒂芬大帝
TA貢獻1827條經驗 獲得超8個贊
您正在嘗試使用 java 代碼中的用戶連接它sys，但表employee存在于hr架構中。
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
您可以更改從表中獲取數據的方式employee（使用其架構查詢表）
//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貢獻1794條經驗 獲得超8個贊
請嘗試一下這段代碼。它必須工作
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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