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我寫下了下面的代碼。在步驟5執行「顯示記錄」後，它會拋出ResultSet錯誤。我已經通讀了幾個問題，但沒有一個處理類似的問題。我更換了星號的用戶名和密碼，原因很明顯用盡結果集錯誤：導出值時出錯
package org.oracle.pojo;
//STEP 1. Import required packages
import java.sql.*;
public class JDBCExample {
// JDBC driver name and database URL
static final String JDBC_DRIVER = "oracle.jdbc.driver.OracleDriver";
static final String DB_URL = "jdbc:oracle:thin:@10.180.35.58:1521:DBV6SP1M";
// Database credentials
static final String USER = "*****";
static final String PASS = "******";
public static void main(String[] args) {
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
try{
//STEP 2: Register JDBC driver
Class.forName(JDBC_DRIVER);
//STEP 3: Open a connection
System.out.println("Connecting to database...");
conn = DriverManager.getConnection(DB_URL,USER,PASS);
//STEP 4: Execute a query to create statment with
// required arguments for RS example.
System.out.println("Creating statement...");
stmt = conn.createStatement(
ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_READ_ONLY);
String sql;
sql = "SELECT id, first, last, age FROM Employees";
boolean status = stmt.execute(sql);
if(status){
//query is a select query.
rs = stmt.getResultSet();
}
// Move cursor to the last row.
System.out.println("Moving cursor to the last...");
rs.last();
//-------------------------------------------------------------------------
//STEP 5: Extract data from result set
System.out.println("Displaying record...");
//Retrieve by column name
int id = rs.getInt("id");
int age = rs.getInt("age");
String first = rs.getString("first");
String last = rs.getString("last");
//Display values
System.out.print("ID: " + id);
System.out.print(", Age: " + age);
System.out.print(", First: " + first);
System.out.println(", Last: " + last);
// Move cursor to the first row.
System.out.println("Moving cursor to the first row...");
rs.first();
//STEP 6: Extract data from result set
System.out.println("Displaying record...");
//Retrieve by column name
id = rs.getInt("id");
age = rs.getInt("age");
first = rs.getString("first");
last = rs.getString("last");
//Display values
System.out.print("ID: " + id);
System.out.print(", Age: " + age);
System.out.print(", First: " + first);
System.out.println(", Last: " + last);
// Move cursor to the first row.
System.out.println("Moving cursor to the next row...");
rs.next();
//STEP 7: Extract data from result set
System.out.println("Displaying record...");
id = rs.getInt("id");
age = rs.getInt("age");
first = rs.getString("first");
last = rs.getString("last");
//Display values
System.out.print("ID: " + id);
System.out.print(", Age: " + age);
System.out.print(", First: " + first);
System.out.println(", Last: " + last);
//STEP 8: Clean-up environment
rs.close();
stmt.close();
conn.close();
}catch(SQLException se){
//Handle errors for JDBC
se.printStackTrace();
}catch(Exception e){
//Handle errors for Class.forName
e.printStackTrace();
}finally{
//finally block used to close resources
try{
if(stmt!=null)
stmt.close();
}catch(SQLException se2){
}// nothing we can do
try{
if(conn!=null)
conn.close();
}catch(SQLException se){
se.printStackTrace();
}//end finally try
}//end try
System.out.println("Goodbye!");
}//end main
}//end JDBCExample