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java連接mysql數據庫如何實現單條插入和批量插入,相信很多沒有經驗的人對此束手無策,為此本文總結了問題出現的原因和解決方法,通過這篇文章希望你能解決這個問題。
1、連接數據庫
package com.njupt.ymh; import java.sql.DriverManager;import java.sql.SQLException;import com.mysql.jdbc.Connection; public class Connect_MySQL { private static final String URL="jdbc:mysql://127.0.0.1:3306/news"; // 一般默認3306,這里設置成6666 (33060) MYSQL8 WMPNetworkSvc private static final String USER="root"; private static final String PASSWORD="12345"; private static Connection connection=null; static{ //1、加載驅動程序(反射的方法) try { Class.forName("com.mysql.jdbc.Driver"); } catch (ClassNotFoundException e) { e.printStackTrace(); } //2、連接數據庫 try { connection=(Connection) DriverManager. getConnection(URL, USER,PASSWORD);//地址,用戶名,密碼 } catch (SQLException e) { e.printStackTrace(); } } public static Connection getConnection(){ return connection; } }
2、單條插入
package com.njupt.ymh;/** * 單條插入數據 */ import java.sql.SQLException;import java.util.List; import com.mysql.jdbc.Connection; public class OperationPaper { private static Connection connection=Connect_MySQL.getConnection(); public void addNewsPaper(NewsPaper newsPaper){//增 // connection = Connect_MySQL.getConnection(); String sql="insert into papertest (id, date, title, lead_pargraph, full_text) values(?, ?, ?, ?, ?)"; java.sql.PreparedStatement ptmt = null; try { ptmt = connection.prepareStatement(sql); } catch (SQLException e1) { e1.printStackTrace(); } try { ptmt.setLong(1, newsPaper.getID()); ptmt.setString(2, newsPaper.getDate()); ptmt.setString(3, newsPaper.getTitle()); ptmt.setString(4, newsPaper.getLead()); ptmt.setString(5, newsPaper.getfull()); ptmt.execute();//執行給定的SQL語句,該語句可能返回多個結果 } catch (SQLException e) { e.printStackTrace(); } } public static void main(String[] args) { OperationPaper operationPaper = new OperationPaper(); List<String> listFile = SearchFile.getAllFile("E:\\huadai\\1996\7\\21", false); // 文件列表 for (String string : listFile) { NewsPaper newsPaper = new NewsPaper(string); if (newsPaper.isUseful()) operationPaper.addNewsPaper(newsPaper); // 插入數據庫 } } }
3、批量插入
package com.njupt.ymh; import java.sql.SQLException;import java.util.ArrayList;import java.util.List; import com.mysql.jdbc.Connection; public class OperaOnNewsPaper implements Cloneable{ private static Connection connection=Connect_MySQL.getConnection(); /** * 支持批量插入數據 * @param newsPaper */ public void addNewsPaper(ArrayList<NewsPaper> listNewsPaper){//增 String sql="insert into papertest (id, date, title, lead_pargraph, full_text) values(?, ?, ?, ?, ?)"; java.sql.PreparedStatement ptmt = null; try { connection.setAutoCommit(false);// 關閉事務 ptmt = connection.prepareStatement(sql); } catch (SQLException e2) { e2.printStackTrace(); } for (NewsPaper paperaper : listNewsPaper) { try { ptmt.setLong(1, paperaper.getID()); ptmt.setString(2, paperaper.getDate()); ptmt.setString(3, paperaper.getTitle()); ptmt.setString(4, paperaper.getLead()); ptmt.setString(5, paperaper.getfull()); ptmt.addBatch(); } catch (SQLException e) { e.printStackTrace(); } } try { ptmt.executeBatch();//執行給定的SQL語句,該語句可能返回多個結果 connection.commit(); } catch (SQLException e) { e.printStackTrace(); } } public static void main(String[] args) { OperaOnNewsPaper operation = new OperaOnNewsPaper(); List<String> listFile = SearchFile.getAllFile("E:\\huadai\\2007", false); // 文件列表 ArrayList<NewsPaper> listPaper = new ArrayList<>(); int count = 0; int sizenum = 1000; for (String string : listFile) { NewsPaper newsPaper = new NewsPaper(string); if (newsPaper.isUseful()) { count++; listPaper.add(newsPaper); // 新聞列表 if (count % sizenum == 0) { //System.out.println("ok"); System.out.println(" " + count); operation.addNewsPaper(listPaper); //插入數據庫 System.out.println(count); listPaper.clear(); } } } if (count %sizenum != 0) { operation.addNewsPaper(listPaper); System.out.println("zui hou "); } }}
通過實際測試,大概十萬級數據批量插入要不單條插入節省10分鐘左右時間。因為每次單條插入就要和數據庫建立一次連接,進行一次日志更新。但是,如果批量插入過程中,批量的數據值有一條不符合格式就將導致本次批量插入整體失敗,因此需要對失敗情況進行處理,或者對批量插入的數據進行預處理,保證批量插入能夠成功。
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