Java操作Oracle實現使用PreparedStatement 批量更新數據

目錄

 

背景

一、獲取數據庫連接

二、關閉數據庫連接

三、獲取查詢數據

四、對數據進行加密並批量更新

---

背景

今天需要實現將Oracle數據庫中的指定字段取出來，使用Base64進行加密，然後將加密結果存回去，涉及到Oracle數據庫的操作。

一、獲取數據庫連接

public static Connection getConnection(){
        Connection conn = null;

        //設置數據庫的連接地址
//        String url  = "jdbc:oracle:thin:@localhost:1521:test";//改格式數據庫連接時一直報錯
        String url = "jdbc:oracle:thin:@(DESCRIPTION =(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT =1521))(CONNECT_DATA =(SERVER = DEDICATED)(SERVICE_NAME =test)))";
        String user = "crawlm";
        String passwd = "crawlm_Sd";

        try{
            //加載數據庫驅動
            Class.forName("oracle.jdbc.driver.OracleDriver");
            //獲取數據庫連接
            conn = DriverManager.getConnection(url,user,passwd);
        } catch (ClassNotFoundException e){
            e.printStackTrace();
            System.out.println("加載數據庫啓動失敗！");
        } catch (SQLException e) {
            e.printStackTrace();
            System.out.println("獲取數據庫連接失敗！");
        }
        return conn;
    }

二、關閉數據庫連接

 public static void closeConnection(Connection conn, PreparedStatement ps, ResultSet rs){
        //關閉結果集對象
        try{
            if (rs != null){
                rs.close();
            }
        }catch (SQLException e){
            e.printStackTrace();
            System.out.println("關閉ResultSet失敗！");
        }
        //關閉SQL語句預編譯對象
        try {
            if (ps != null){
                ps.close();
            }
        } catch (SQLException e) {
            e.printStackTrace();
            System.out.println("關閉PreparedStatement失敗!");
        }
        //關閉數據庫連接
        try{
            if (conn != null){
                conn.close();
            }
        }catch (SQLException e){
            e.printStackTrace();
            System.out.println("關閉Connetion失敗！");
        }
    }

三、獲取查詢數據

 public static ResultSet getResultSet(){
        Connection conn = null;
        PreparedStatement statement = null;
        ResultSet rs = null;
        String querySql = "select KEYWORDS1 from KEYWORDS_ALL";

        try{
            conn = OracleUtil.getConnection();
            if (conn == null){
                System.out.println("獲取連接失敗");
            }
            statement = conn.prepareStatement(querySql);
            rs = statement.executeQuery();
            return rs;

        } catch (SQLException e) {
            e.printStackTrace();
            return rs;
        }finally {

            OracleUtil.closeConnection(conn,statement,rs);
            return rs;
        }
    }

四、對數據進行加密並批量更新

 public static int updateBatchData(List<KeyWords2Base64> data){
        Connection conn = null;
        PreparedStatement statement = null;
        ResultSet rs = null;
        //更新SQL語句
        String updateSql = "update KEYWORDS_ALL set KEYWORDS2=? where  KEYWORDS1=?";
        try{
            conn = OracleUtil.getConnection();
            if (conn == null){
                System.out.println("獲取連接失敗");
            }

            //關閉自動提交事務
            conn.setAutoCommit(false);
            //創建一個 PreparedStatement 對象來將參數化的 SQL語句發送到數據庫
            statement = conn.prepareStatement(updateSql);
            //將一組參數添加到此 PreparedStatement 對象的批處理命令中
            for (KeyWords2Base64 subdata: data){
                statement.setString(1,subdata.getKeyword2());
                statement.setString(2,subdata.getKeyword1());
                statement.addBatch();
            }
            //執行更新操作
            statement.executeBatch();
            //語句執行完畢，提交事務
            conn.commit();

        } catch (SQLException e) {
            e.printStackTrace();
            System.out.println(1);
            return -1;
        }finally {
            OracleUtil.closeConnection(conn,statement,rs);
            System.out.println(2);
            return -2;
        }

    }

五、完整代碼

package program;

import java.sql.*;
import java.util.List;

/**
 * @ClassName OracleUtil
 * @Date 2020/3/26 8:34
 * @Description
 * Oracle數據庫工具類
 */

public class OracleUtil {
    /**
     * 獲取Oracle數據庫連接
     * @return connnetion
     */
    public static Connection getConnection(){
        Connection conn = null;

        //設置數據庫的連接地址
//        String url  = "jdbc:oracle:thin:@localhost:1521:test";//改格式數據庫連接時一直報錯
        String url = "jdbc:oracle:thin:@(DESCRIPTION =(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT =1521))(CONNECT_DATA =(SERVER = DEDICATED)(SERVICE_NAME =test)))";
        String user = "crawlm";
        String passwd = "crawlm_Sd";

        try{
            //加載數據庫驅動
            Class.forName("oracle.jdbc.driver.OracleDriver");
            //獲取數據庫連接
            conn = DriverManager.getConnection(url,user,passwd);
        } catch (ClassNotFoundException e){
            e.printStackTrace();
            System.out.println("加載數據庫啓動失敗！");
        } catch (SQLException e) {
            e.printStackTrace();
            System.out.println("獲取數據庫連接失敗！");
        }
        return conn;
    }

    /**
     * 關閉數據庫連接方法
     * @param conn Connection
     * @param ps PreparedStatement
     * @param rs ResultSet
     */
    public static void closeConnection(Connection conn, PreparedStatement ps, ResultSet rs){
        //關閉結果集對象
        try{
            if (rs != null){
                rs.close();
            }
        }catch (SQLException e){
            e.printStackTrace();
            System.out.println("關閉ResultSet失敗！");
        }
        //關閉SQL語句預編譯對象
        try {
            if (ps != null){
                ps.close();
            }
        } catch (SQLException e) {
            e.printStackTrace();
            System.out.println("關閉PreparedStatement失敗!");
        }
        //關閉數據庫連接
        try{
            if (conn != null){
                conn.close();
            }
        }catch (SQLException e){
            e.printStackTrace();
            System.out.println("關閉Connetion失敗！");
        }
    }

    /**
     * 獲取數據庫數據方法
     * @return
     */
    public static ResultSet getResultSet(){
        Connection conn = null;
        PreparedStatement statement = null;
        ResultSet rs = null;
        String querySql = "select KEYWORDS1 from KEYWORDS_ALL";

        try{
            conn = OracleUtil.getConnection();
            if (conn == null){
                System.out.println("獲取連接失敗");
            }
            statement = conn.prepareStatement(querySql);
            rs = statement.executeQuery();
            return rs;

        } catch (SQLException e) {
            e.printStackTrace();
            return rs;
        }finally {

            OracleUtil.closeConnection(conn,statement,rs);
            return rs;
        }
    }

    /**
     * 更新數據庫方法
     * @param data
     * @return
     */
    public static int updateBatchData(List<KeyWords2Base64> data){
        Connection conn = null;
        PreparedStatement statement = null;
        ResultSet rs = null;
        //更新SQL語句
        String updateSql = "update  KEYWORDS_ALL set KEYWORDS2=? where  KEYWORDS1=?";
        try{
            conn = OracleUtil.getConnection();
            if (conn == null){
                System.out.println("獲取連接失敗");
            }

            //關閉自動提交事務
            conn.setAutoCommit(false);
            //創建一個 PreparedStatement 對象來將參數化的 SQL語句發送到數據庫
            statement = conn.prepareStatement(updateSql);
            //將一組參數添加到此 PreparedStatement 對象的批處理命令中
            for (KeyWords2Base64 subdata: data){
                statement.setString(1,subdata.getKeyword2());
                statement.setString(2,subdata.getKeyword1());
                statement.addBatch();
            }
            //執行更新操作
            statement.executeBatch();
            //語句執行完畢，提交事務
            conn.commit();

        } catch (SQLException e) {
            e.printStackTrace();
            System.out.println(1);
            return -1;
        }finally {
            OracleUtil.closeConnection(conn,statement,rs);
            System.out.println(2);
            return -2;
        }

    }

}