1、 jdbd采用批处理插入大量数据,速度还是相当的慢,一个拥有一个自增字段、三个字符串字段的表,往里面插入1W条数据消耗一分多钟。代码如下: public class DBbatchdeal {/** * * @param conn jdbc链接 * @param tableName 表明 * @param lists 数据集 * @
1、 jdbd采用批处理插入大量数据,速度还是相当的慢,一个拥有一个自增字段、三个字符串字段的表,往里面插入1W条数据消耗一分多钟。代码如下:
<span>public class DBbatchdeal { /** * * @param conn jdbc链接 * @param tableName 表明 * @param lists 数据集 * @param n 每行字段个数 出去自增字段 * @param flag 第一列是否自增字段 * @return 是否成功 */ public boolean deal(Connection conn,String tableName,ArrayList<String[]> lists ,int n,boolean flag){ StringBuffer sql = new StringBuffer(); sql.append("insert into ").append(tableName) .append(" values("); sql=(flag==true?sql.append("null ,"):sql); for(int i=0;i<n-1;i++){ sql.append("?, "); } sql.append("?);"); int size=lists.size(); int m= (true==flag?n-1:n); PreparedStatement preStmt=null; long a=System.currentTimeMillis(); try { preStmt = conn.prepareStatement(sql.toString(),ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY); for(int j=0;j<size;j++){ String[] str=lists.get(j); for(int k=0;k<n;k++){ preStmt.setString(k+1, str[k]); } preStmt.addBatch(); if(j%100==0){ preStmt.executeBatch(); preStmt.clearBatch(); } } preStmt.executeBatch(); } catch (SQLException e) { e.printStackTrace(); }finally{ try { if(null!=preStmt){ preStmt.close(); } } catch (SQLException e) { e.printStackTrace(); } } long b=System.currentTimeMillis(); System.out.println("插入"+size+"条数据所需要的时间:"+(b-a)); return true; } public static void main(String[] args) throws ClassNotFoundException, SQLException { Class.forName("com.mysql.jdbc.Driver"); Connection conn=DriverManager.getConnection("jdbc:mysql://ip***/db", "root", "pwd"); DBbatchdeal deal=new DBbatchdeal(); ArrayList<String[]> lists =new ArrayList<String[]>(); for(int i=0;i<10000;i++){ String[] str={"1307"+i,"passwd"+i,"20130709121212"}; lists.add(str); } deal.deal(conn, "testTable", lists, 3, true); } } </span>
2、因为上面的方法处理的较慢,又想了个较为麻烦点儿的方式,用mysql的load data来导入数据。具体就是写段导入数据的脚本用java来执行,测试了下1w条记录插入的时间还是相当短的。
结果如下:
Java2Sh内容如下:
<span>import java.io.BufferedWriter; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import java.io.OutputStreamWriter; import java.io.Writer; public class Java2Sh { /** * 对文件进行赋权 * @param infile 文件全路径 * @return runtime执行返回码 */ public int chmodrun(String infile) { int retCode = 0; try { Runtime rtime = Runtime.getRuntime(); Process child = rtime.exec("chmod 777 " +infile); retCode=child.waitFor(); System.out.println("chmod :"+retCode); } catch (Exception e) { System.out.println("chmod failed "+infile); e.printStackTrace(); } return retCode; } /** *执行脚本文件 * @param infile 文件全路径 * @return runtime执行返回码 */ public int shellFile(String infile) { int retCode = 0; try { Runtime rtime = Runtime.getRuntime(); Process child = rtime.exec("sh " +infile); retCode=child.waitFor(); System.out.println("shell file :"+retCode); } catch (Exception e) { System.out.println("shell file failed "+infile); e.printStackTrace(); } return retCode; } public void writeData() throws IOException{//生成mysql2.txt String str="13311122,passwds,20130710235959"; BufferedWriter out =new BufferedWriter(new OutputStreamWriter(new FileOutputStream(new File("D:\\mysql2.txt")))); for(int i=0;i<10000;i++){ out.write(str); out.write("\n"); } out.flush(); out.close(); } public static void main(String[] args) throws IOException { Java2Sh j2=new Java2Sh(); long a=System.currentTimeMillis(); j2.chmodrun("/shh.sh"); j2.shellFile("/shh.sh"); long b=System.currentTimeMillis(); System.out.println("==========="+(b-a)); // j2.writeData(); } } </span>
mysql -h localhost -u root -ppwd < /loaddata.sql > /dblog
loaddata.sql内容为:
use dbname;
LOAD DATA INFILE '/mysql2.txt' INTO TABLE testTable FIELDS TERMINATED BY ',' (cardnum,cardpwd,times);
commit;
介于个人水平,贴出来仅供参考,欢迎告诉我更简便高效的方式,先谢过了。