Jsp code database updating

Jsp code database updating

Dear friend before I shift using prepaidstatement I want to try my best using the statement to fix the problem.

Your suggestion works but it is for the first row of the table.

Although the target database system is My SQL, but the same technique can be applied for other database systems as well because the query syntax used is standard SQL which is supported by all relational database systems.

The problem is onthe line st.execute Update("update opinions set yess='ys' where question='q' "); please help me.

The value is casted to a String because we know that the username field is of type VARCHAR based on the database schema mentioned previously. "; Prepared Statement statement = conn.prepare Statement(sql); String(1, "123456789"); String(2, "William Henry Bill Gates"); String(3, "[email protected]"); String(4, "bill"); int rows Updated = statement.execute Update(); if (rows Updated String sql = "DELETE FROM Users WHERE username=?

create database Sample DB; use Sample DB; CREATE TABLE `users` ( `user_id` int(11) NOT NULL AUTO_INCREMENT, `username` varchar(45) NOT NULL, `password` varchar(45) NOT NULL, `fullname` varchar(45) NOT NULL, `email` varchar(45) NOT NULL, PRIMARY KEY (`user_id`) ); Practical Database Programming with Java - This book is for those who are beginner in Java database programming and want to catch up with the main database programming techniques with straightforward and easy to learn example code. )"; Prepared Statement statement = conn.prepare Statement(sql); String(1, "bill"); String(2, "secretpass"); String(3, "Bill Gates"); String(4, "[email protected]"); int rows Inserted = statement.execute Update(); if (rows Inserted method to execute the INSERT statement.

String db URL = "jdbc:mysql://localhost:3306/sampledb"; String username = "root"; String password = "secret"; try { Connection conn = Driver Connection(db URL, username, password); if (conn ! This method returns an update count indicating how many rows in the table were affected by the query, so checking this return value is necessary to ensure the query was executed successfully.

This tutorial is going to help you learning how to do basic database operations (CRUD - Create, Retrieve, Update and Delete) using JDBC (Java Database Connectivity) API.

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These CRUD operations are equivalent to the INSERT, SELECT, UPDATE and DELETE statements in SQL language.

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