Still in the same scenario, let's talk about the second method of adding millions of data.
Scenes
The App of Lemon Class is online, and now it needs the information of one million trainees for the stress test, so where does the data come from? Ask the developers for help directly? May be despised! Go to insert one by one? Well, it will take about 20 years after all!
Don't be afraid, Teacher Happy will teach you 100 ways to create 1 million data efficiently!
Below is a student transcript in the Lemon Class APP,
The table structure is very simple, id is the primary key, self-growth uniquely identifies a student, sName is the nickname of each student in the lemon class, phone is the mobile phone number, and there is a score field that we love and hate. Attached table SQL:
drop table if exists tb_lemon_student_score;create table tb_lemon_student_score( id int primary key auto_increment, sName varchar(50), phone varchar(11), score tinyint(1));
The second method: program language to generate data, use tools to import
Our idea is to generate millions of data with agreed rules through the programming language, save them in a text file, and then use the powerful import function of Navicat For MySQL to import millions of data into the database.
1: JAVA programming: write an application that generates data
Open Eclipse and write the following code:
import java.util.Random;public class BatchInsertTest {
public static void main(String[] args) {
Random random = new Random();
for (int i = 1; i <= 1000000; i++) {
// student id
int id = i;
// the name of the student
String sName = "s_" + i;
// mobile phone number
long mobile = 13000000000L + i;
// score
int score = random.nextInt(100);
System.out.println(id + "|" + sName + "|" + mobile + "|" + score);
}
}}
Program description: The program uses a for loop to output 1 million pieces of student information to the console. Each line represents one student information. The rule is: id from 1 to 100w, sName is s_ spliced with id value, mobile phone number is 13000000000+id value , A random integer from 0 to 100, each field is separated by a separator "|" (this separator is useful when importing data to the database).
Run the JAVA application, as shown in the figure:
The program can normally output the data we require to the console, but the number of lines is limited. The default Eclipse console shows the number of lines is limited. This number of lines can be adjusted, but the copy of millions of lines of text data is very expensive Resources, so introduce another more efficient method, you can directly save all the output of our console to a specified file.
2: Save the program output to the specified file
1) Right-click the JAVA class -> select Run As -> select Run Configurations
2) Select the Common item on the Run Configurations interface -> check Output File -> select File System to set the location to save the file, here is set to the desktop data.txt file: C:\Users\tommy\Desktop\data.txt
3) Run the program again, and you can see that a data.txt file is generated on the desktop. The content of the opened file is as follows, a total of 1 million lines:
3: Navicat For MySQL import text data
Right-click the data table, select Import Wizard, select the import type as txt, and after a series of import settings, start importing:
Note: Pay special attention to setting the separator in the middle to the vertical bar "|". After about one minute, the import ends.
Finally, select spot check, the data has met our requirements
Above are some videos and interview questions I collected.
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