SQL Transactions in Java

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1. Rollback all data on import from a table if a row is corrupted.You have a list of sql queries as a parameter:
– create database connection:

– set autocommit on false :

(read note1*)
– declare a boolean variable that will be set on true if all is going according to the plan and no errors found

– execute queries and ‘find’ out what worked and what failed:

*Note1:remember that statement.close() will ignore the connection.setAutocommit(false) and will execute and commit the sql.

2. Rollback using Savepoints:

Note2: A simple rollback or commit erases all savepoints.

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4 Comments
  • WP Themes says:

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    June 30, 2010 at 3:51 pm
  • javaexpert says:

    You say: ‘set autocommit on false ‘ yet you set it to ‘true’ (connection.setAutoCommit(true);). Actually it should be done like this: first you set autocommit to false and right after you do the connection.commit(); you set it to true again:

    Connection connection = Database.getInstance().getConnection();
    – set autocommit on false :
    connection.setAutoCommit(false);

    boolean executed = true;

    try {
    for(String sql : listOfSQLQueries) {
    result = stmt.executeUpdate(sql);
    if(result == 0) {
    executed = false;
    break;
    } else {
    executed = true;
    }
    }
    } catch (Exception e) {
    executed = false;
    }
    – if error found, rollback:
    if (!executed) {
    connection.rollback();
    } else {
    connection.commit();
    connection.setAutoCommit(true);
    }

    July 13, 2010 at 1:46 pm
  • javaexpert says:

    You say: \’set autocommit on false \’ yet you set it to \’true\’ (connection.setAutoCommit(true);). Actually it should be done like this: first you set autocommit to false and right after you do the connection.commit(); you set it to true again:

    Connection connection = Database.getInstance().getConnection();
    – set autocommit on false :
    connection.setAutoCommit(false);

    boolean executed = true;

    try {
    for(String sql : listOfSQLQueries) {
    result = stmt.executeUpdate(sql);
    if(result == 0) {
    executed = false;
    break;
    } else {
    executed = true;
    }
    }
    } catch (Exception e) {
    executed = false;
    }
    – if error found, rollback:
    if (!executed) {
    connection.rollback();
    } else {
    connection.commit();
    connection.setAutoCommit(true);
    }

    July 13, 2010 at 1:47 pm
  • javaexpert says:

    You say: set autocommit on false yet you set it to true (connection.setAutoCommit(true);). Actually it should be done like this: first you set autocommit to false and right after you do the connection.commit(); you set it to true again:

    Connection connection = Database.getInstance().getConnection();
    – set autocommit on false :
    connection.setAutoCommit(false);

    boolean executed = true;

    try {
    for(String sql : listOfSQLQueries) {
    result = stmt.executeUpdate(sql);
    if(result == 0) {
    executed = false;
    break;
    } else {
    executed = true;
    }
    }
    } catch (Exception e) {
    executed = false;
    }
    – if error found, rollback:
    if (!executed) {
    connection.rollback();
    } else {
    connection.commit();
    connection.setAutoCommit(true);
    }

    July 13, 2010 at 1:47 pm

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