Insert several records simultaneously with java and mysql

Question

0.00/5 (No votes)

See more:

Dear Community a pleasure to greet you, I am reading several HoldinRegister type registers for that I am using easymodbus in total will be 150 registers that must be read and saved each time a Coil type register changes from 0 to 1, the reading of these registers is done as follows:

Java

public static void main(String[] args) throws Exception
{
    ModbusClient modbusClient = new ModbusClient();
    modbusClient.Connect("127.0.0.1", 502);
    int[] inputRegisters = modbusClient.ReadHoldingRegisters(0, 149);
    for (int i=0; i < inputRegisters.length; i++)
        System.out.println("Holding Register  #"+i+": "+inputRegisters[i]);
}

The values of the registers are updated only when the Coil changes its value, then save those registers in the database, I think this is better because if they would be updating all the time it would consume too many resources.

My question now is how can I do to save that amount of data at the same time, searching the net I found an example using FOR but I don't understand very well how to integrate it since I can't make it work.

Java

String SQL = "INSERT INTO ingredients(date,regnumb,regval)"
    + "values (?,?,?)";

    mensaje="data inserted correctly";
    try{
        PreparedStatement sqls = (PreparedStatement) conn.prepareStatement(SQL);
       
        int rows =4;
     
             
        for(int i = 0; i
        sqls.setString(1, date);
        sqls.setString(2, regnumb);          
        sqls.setString(5, regval);
        sqls.addBatch();
} sqls.executeBatch();

thank you very much for your attention

What I have tried:

insert several records simultaneously with java and mysql

Posted 1-Apr-22 8:58am

Ame5577

Updated 1-Apr-22 22:37pm

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Richard MacCutchan · Answer 1 · 2022-04-01T22:37:00

You are setting SQL parameter 1, 2, and 5 (why 5 and not 3?) to the same values each time. You need something like:

Java

for (int i=0; i < inputRegisters.length; i++) {
    sqls.setString(1, date);
    sqls.setString(2, inputRegisters[i].number); // however you get the number      
    sqls.setString(3, inputRegisters[i].value);  // and the value
    sqls.addBatch();
}
int[] results = sqls.executeBatch();
//

See also Statement (Java Platform SE 7 )[^] and java.sql.PreparedStatement.addBatch java code examples | Tabnine[^].