Java代码批量插入数据到MySQL

1、批量插入

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Random;
 
public class SQLGenApplication {
    public static void main(String[] args) throws IOException {
        
        StringBuilder insertBuf = new StringBuilder("INSERT INTO `table1` (`id`, `uid`, `a`, `b`) VALUES");
        String values = "('%s', '%s',  '%s.00', '%s.00'),";
        BufferedReader fis = new BufferedReader(new FileReader("fileParam.txt"));
        String line = null;
        Random r = new Random();
        
        int cnt = 0;
        int batch = 0;
        int perCnt = 2500;
        while((line = fis.readLine()) != null) {
            
            long id = Long.parseLong(line.substring(8));
 
            int i = r.nextInt(100);
            while(i <= 0 ) {
                i = r.nextInt(100);
            }
            int i2 = r.nextInt(100);
            while(i2 < i ) {
                i2 = r.nextInt(100);
            }
            insertBuf.append(String.format(values, id, line, i, i2));
            if(cnt < perCnt) {
                cnt++;
 
            } else {
 
                insertBuf.deleteCharAt(insertBuf.length()-1);
                insertBuf.append(";");
                FileWriter fw = new FileWriter("fileSQL" + batch + ".sql");
                fw.write(insertBuf.toString());
                fw.flush();
                fw.close();
                cnt = 0;
                batch++;
                
                insertBuf =  new StringBuilder("INSERT INTO `table1` (`id`, `uid`, `a`, `b`) VALUES");
            }
        }
        if(cnt != 0 && cnt < perCnt) {
 
            insertBuf.deleteCharAt(insertBuf.length()-1);
            insertBuf.append(";");
            FileWriter fw = new FileWriter("fileSQL" + batch + ".sql");
            fw.write(insertBuf.toString());
            fw.flush();
            fw.close();
            cnt = 0;
            
        }
        
    
        fis.close();
    }
}

2、存储过程插入

use `数据库名称`;
DELIMITER $$ 
drop procedure if exists data_100w_gen$$
create procedure data_100w_gen(IN startIdx int, IN endIdx int, IN prefix varchar(1000), IN surfix varchar(1000), out ex_sql_out longtext) 
begin
    declare ex_sql longtext default prefix;
    -- 超时设置
    set global delayed_insert_timeout=20000;
    set global connect_timeout = 20000;
    set global net_read_timeout = 20000;
    set global net_write_timeout = 20000;
    while startIdx<=endIdx-1 DO
        set ex_sql = concat(ex_sql, "(", CAST(startIdx AS CHAR), surfix, ",");
        set startIdx=startIdx+1;
    end while; 
    set ex_sql_out = concat(ex_sql, "(", CAST(endIdx AS CHAR), surfix, ";");
    -- select ex_sql_out from dual; 
end$$
 
drop procedure if exists data_batch_gen$$
create procedure data_batch_gen(IN startIdx int, IN endIdx int, IN prefix varchar(1000), IN surfix varchar(1000)) 
begin
    declare batchSize int default 25000;
    declare batchSize_1 int default batchSize-1;
    declare endIdxGen int default 0;
    set @ex_sql_out = "";
    if(endIdx < batchSize) then
        call data_100w_gen(startIdx, endIdx, prefix, surfix, @ex_sql_out);
                PREPARE data_gen_prep FROM @ex_sql_out;
                EXECUTE data_gen_prep;
                DEALLOCATE PREPARE data_gen_prep;
    else
        while startIdx<=endIdx DO -- 循环开始
            set endIdxGen = startIdx + batchSize_1;
                    if(endIdxGen > endIdx) then
                        set endIdxGen = endIdx;
                    end if;
            call data_100w_gen(startIdx, endIdxGen, prefix, surfix, @ex_sql_out);
                PREPARE data_gen_prep FROM @ex_sql_out;
            EXECUTE data_gen_prep;
            DEALLOCATE PREPARE data_gen_prep;
            set startIdx = endIdxGen + 1;
            select endIdxGen from dual; -- 打印每次生成数量
        end while; -- 循环结束
    end if;
    -- select @ex_sql_out from dual;
end$$
delimiter ;

转自：https://onefire.blog.csdn.net/article/details/120015121

 

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