Jdbc连接类方法setAutoCommit（）的行为

Question

What will happen if we use setAutoCommit(true) twice in Java class with oracle DB.

try{
    Connection conn = getConnection();
    conn.setAutoCommit(true);
    conn.setAutoCommit(true);
}catch (exception ex){
}

Answer 1

From Javadoc

If setAutoCommit is called and the auto-commit mode is not changed, the call is a no-op.

So if you call setAutoCommit() with the same argument several times only first call will be executed. All subsequent calls with the same argument will be ignored.