java处理较大数据量到mysql

  • 时间:

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
	 * @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);
			}
	
}

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:

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();
	}
	
}


其中shh.sh内容为:

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