Java完成Dbhelper支撐年夜數據增刪改。本站提示廣大學習愛好者:(Java完成Dbhelper支撐年夜數據增刪改)文章只能為提供參考,不一定能成為您想要的結果。以下是Java完成Dbhelper支撐年夜數據增刪改正文
在做項目標時刻,技巧選型很主要,在底層的辦法直接影響了我們對年夜數據拜訪和修正的速度,在Java中有許多優良的ORM框架,好比說:JPA,Hibernate 等等,正如我們所說的,框架有框架的利益,固然也存在一些可以改良的處所,這個時刻,就須要我們針關於分歧的營業分歧的需求,分歧的拜訪量,對底層的架構從新封裝,來支撐年夜數據增刪改。
代碼:
import java.io.*; import java.sql.*; import java.util.*; import java.util.logging.Level; import java.util.logging.Logger; import javax.servlet.jsp.jstl.sql.*; /** * DbHelper * @author qmx * */ public class Dbhelper { private String sql; //要傳入的sql語句 public void setSql(String sql) { this.sql = sql; } private List sqlValues; //sql語句的參數 public void setSqlValues(List sqlValues) { this.sqlValues = sqlValues; } private List<List> sqlValue; //sql語句的參數 public void setSqlValue(List<List> sqlValues) { this.sqlValue = sqlValues; } private Connection con; //銜接對象 public void setCon(Connection con) { this.con = con; } public Dbhelper(){ this.con=getConnection(); //給Connection的對象賦初值 } /** * 獲得數據庫銜接 * @return */ private Connection getConnection(){ String driver_class=null; String driver_url=null; String database_user=null; String database_password=null; try { InputStream fis=this.getClass().getResourceAsStream("/db.properties"); //加載數據庫設置裝備擺設文件到內存中 Properties p=new Properties(); p.load(fis); driver_class=p.getProperty("driver_class"); //獲得數據庫設置裝備擺設文件 driver_url=p.getProperty("driver_url"); database_user=p.getProperty("database_user"); database_password=p.getProperty("database_password"); Class.forName(driver_class); con=DriverManager.getConnection(driver_url,database_user,database_password); } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return con; } /** * 封閉數據庫 * @param con * @param pst * @param rst */ private void closeAll(Connection con,PreparedStatement pst,ResultSet rst){ if(rst!=null){ try { rst.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } if(pst!=null){ try { pst.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } if(con!=null){ try { con.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } /** * 封閉數據庫 * @param con * @param pst * @param rst */ private void closeAll(Connection con,Statement pst,ResultSet rst){ if(rst!=null){ try { rst.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } if(pst!=null){ try { pst.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } if(con!=null){ try { con.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } /** * 查找 * @param sql * @param sqlValues * @return */ public Result executeQuery(){ Result result=null; ResultSet rst=null; PreparedStatement pst=null; try { pst=con.prepareStatement(sql); if(sqlValues!=null&&sqlValues.size()>0){ //當sql語句中存在占位符時 setSqlValues(pst,sqlValues); } rst=pst.executeQuery(); result=ResultSupport.toResult(rst); //必定要在封閉數據庫之前完成轉換 } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); }finally{ this.closeAll(con, pst, rst); } return result; } /** * 增刪改 * @return */ public int executeUpdate(){ int result=-1; PreparedStatement pst=null; try { pst=con.prepareStatement(sql); if(sqlValues!=null&&sqlValues.size()>0){ //當sql語句中存在占位符時 setSqlValues(pst,sqlValues); } result=pst.executeUpdate(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); }finally{ this.closeAll(con, pst, null); } return result; } /** * 應用PreparedStatement加批量的辦法 * @return */ public int[] executeUpdateMore(){ int[] result=null; try{ PreparedStatement prest =con.prepareStatement(sql,ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY); for(List sqlValueString : sqlValue){ for(int i=0;i<sqlValueString.size();i++){ try { prest.setObject(i+1,sqlValueString.get(i)); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } prest.addBatch(); } prest.executeBatch(); /* con.commit();*/ this.closeAll(con, prest, null); } catch (SQLException ex){ Logger.getLogger(Dbhelper.class.getName()).log(Level.SEVERE, null,ex); } return result; } /** * 應用PreparedStatement加批量的辦法,strvalue: * "INSERT INTOadlogs(ip,website,yyyymmdd,hour,object_id) VALUES('192.168.1.3','localhost','20081009',8,'23123')" * @return * @throws SQLException */ public int[] executeUpdateMoreNotAuto() throws SQLException{ int[] result =null; con.setAutoCommit(false); Statement stmt =con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_READ_ONLY); String[] SqlString= null; for(String strvalue : SqlString){ stmt.execute(strvalue); } con.commit(); return result; } /** * 應用PreparedStatement加批量的辦法,strvalue: * "INSERT INTOadlogs(ip,website,yyyymmdd,hour,object_id) VALUES('192.168.1.3','localhost','20081009',8,'23123')" * @return * @throws SQLException */ public int[] executeMoreNotAuto() throws SQLException{ //保留以後主動提交形式 Boolean booleanautoCommit=false; String[] SqlString= null; int[] result= null; try { booleanautoCommit=con.getAutoCommit(); //封閉主動提交 con.setAutoCommit(false); Statement stmt =con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_READ_ONLY); //應用Statement同時搜集多條sql語句 /*stmt.addBatch(insert_sql1); stmt.addBatch(insert_sql2); stmt.addBatch(update_sql3);*/ for(String strvalue : SqlString){ stmt.addBatch(strvalue); } //同時提交一切的sql語句 stmt.executeBatch(); //提交修正 con.commit(); con.setAutoCommit(booleanautoCommit); this.closeAll(con, stmt, null); } catch(Exception e) { e.printStackTrace(); con.rollback(); //設定setAutoCommit(false)沒有在catch中停止Connection的rollBack操作,操作的表就會被鎖住,形成數據庫逝世鎖 } return result; } /** * 給sql語句中的占位符賦值 * @param pst * @param sqlValues */ private void setSqlValues(PreparedStatement pst,List sqlValues){ for(int i=0;i<sqlValues.size();i++){ try { pst.setObject(i+1,sqlValues.get(i)); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } }
我們的在db.properties中寫入拜訪數據庫的信息:
driver_class=com.mysql.jdbc.Driver driver_url=jdbc:mysql://192.168.22.246:3306/importexceltest database_user=basic database_password=basic
測試:
import java.util.*; public class ImportExcelTest { public static void main(String[] args){ /*Dbhelper db = new Dbhelper(); String sql = "insert into tb_coursetype(id,courseTypeName) values('2012003','qmx3')"; db.setSql(sql); db.executeUpdate();*/ /*Dbhelper db1 = new Dbhelper(); String sql1 = "insert into tb_coursetype(id,courseTypeName) values(?,?)"; List sqlValues = new ArrayList(); sqlValues.add("2012004"); sqlValues.add("qmx4"); db1.setSqlValues(sqlValues); db1.setSql(sql1); db1.executeUpdate();*/ Dbhelper db = new Dbhelper(); String sql = "insert into tb_coursetype(id,courseTypeName) values(?,?)"; List<List> sqlValues = new ArrayList(); List sqlValueString =new ArrayList(); sqlValueString.add("2012010"); sqlValueString.add("qmx10"); sqlValues.add(sqlValueString); List sqlValueString1 =new ArrayList(); sqlValueString1.add("2012011"); sqlValueString1.add("qmx11"); sqlValues.add(sqlValueString1); List sqlValueString2 =new ArrayList(); sqlValueString2.add("2012012"); sqlValueString2.add("qmx12"); sqlValues.add(sqlValueString2); List sqlValueString3 =new ArrayList(); sqlValueString3.add("2012013"); sqlValueString3.add("qmx13"); sqlValues.add(sqlValueString3); db.setSqlValue(sqlValues); db.setSql(sql); db.executeUpdateMore(); } }