以下是按正常的數(shù)據(jù)庫查詢操作（沒有做優(yōu)化），代碼如下：

package com.test.main;import java.sql.Connection; import java.sql.ResultSet; import java.sql.Statement;import com.test.jdbc.OracleDBConnection;public class Test {public static void main(String[] args) throws Exception {// TODO Auto-generated method stub //得到Oracle數(shù)據(jù)庫連接Connection conn=new OracleDBConnection().getConnection();//conn.setAutoCommit(false);//設(shè)置為不自動(dòng)提交String sql="select licenseplateno,in_date, gps_time,longitude,latitude,height,speed,direction,eff,car_stat1,car_stat2"+ " from GPS_LOG_cxc";Statement stmt;ResultSet resultSet;//記錄起始時(shí)間 long startTime=System.currentTimeMillis();try {stmt = conn.createStatement();resultSet = stmt.executeQuery(sql);String licenseplateno="";long index =0;while (resultSet.next()) {++index;licenseplateno=resultSet.getString(1);System.out.println(index +">>"+licenseplateno);}resultSet.close();stmt.close();conn.close();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}//記錄結(jié)束時(shí)間long endTime=System.currentTimeMillis();//計(jì)算運(yùn)行時(shí)間 long time=(endTime-startTime)/1000;System.out.println("用時(shí)："+time+"秒 ");} }

關(guān)于數(shù)據(jù)庫連接

Connection conn=new OracleDBConnection().getConnection();我是專門寫了一個(gè)類OracleDBConnection,代碼如下：

package com.test.jdbc;import java.sql.Connection; import java.sql.DriverManager;import com.test.jdbc.IDBConnection; /*** 取得Oracle數(shù)據(jù)庫連接* */ public class OracleDBConnection implements IDBConnection {//DB Driverprivate static final String DBDRIVER="oracle.jdbc.driver.OracleDriver";//DB URLprivate static final String DBURL="jdbc:oracle:thin:@192.168.95.86:1521:orcl"; //DB Userprivate static final String DBUSER="xxtmanage";//DB Passwordprivate static final String DBPASSWORLD="xxtinterface";//DB Connectionprivate Connection conn=null;//structorpublic OracleDBConnection() {//在構(gòu)造方法中進(jìn)行數(shù)據(jù)庫連接System.out.println("OracleDBConnection.OracleDBConnection()");try {// 加載驅(qū)動(dòng)程序Class.forName(DBDRIVER);//連接數(shù)據(jù)庫this.conn=DriverManager.getConnection(DBURL, DBUSER, DBPASSWORLD);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}@Overridepublic Connection getConnection(){System.out.println("OracleDBConnection.getConnection()");return this.conn;}@Overridepublic void close(){System.out.println("OracleDBConnection.close()");if(this.conn!=null){try {this.conn.close();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}

執(zhí)行結(jié)果哪下：

19774887>>粵A434XX 19774888>>粵A434XX 19774889>>粵A434XX 19774890>>粵A434XX 19774891>>粵A434XX 19774892>>粵A434XX 19774893>>粵A434XX 19774894>>粵A434XX 19774895>>粵A434XX 19774896>>粵A434XX 19774897>>粵A434XX 19774898>>粵A434XX 19774899>>粵A434XX 19774900>>粵A434XX 19774901>>粵A434XX 用時(shí)：2367秒 注意：從以上程序可以看出，現(xiàn)在數(shù)據(jù)量只有2000萬條不到，花費(fèi)時(shí)間為2367/60=39.45分鐘。速度讓人很不滿意，所以這就提出來了如何才能快速的讀大批量數(shù)據(jù)呢？？？

解決方法，留待以后再補(bǔ)充。

總結(jié)

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