ebayhoogl.blogg.se - Connect to mysql web gui

Connect to mysql web gui update#
Connect to mysql web gui code#

Open connection if ( this.OpenConnection() = true)

Connect to mysql web gui update#

String query = " UPDATE tableinfo SET name='Joe', age='22' WHERE name='John Smith'" close connection this.CloseConnection() MySqlCommand cmd = new MySqlCommand(query, connection) create command and assign the query and connection from the constructor open connection if ( this.OpenConnection() = true) String query = " INSERT INTO tableinfo (name, age) VALUES('John Smith', '33')"

Connect to mysql web gui code#

This can be done using the constructor, or using the Connection and the CommandText methods in the MySqlCommand class.Ĭopy Code // Insert statement public void Insert()

Assign a connection and a query to the command.

The process to successfully execute a command is as follows: I will start with Insert, update and delete, which are the easiest.

ExecuteScalar: Used to execute a command that will return only 1 value, for example Select Count(*).

ExecuteReader: Used to execute a command that will return 0 or more records, for example Select.

ExecuteNonQuery: Used to execute a command that will not return any data, for example Insert, update or delete.

Usually, Insert, update and delete are used to write or change data in the database, while Select is used to read data.įor this reason, we have different types of methods to execute those queries. } Working with DML (Insert, Update, Select, Delete) MessageBox.Show( " Invalid username/password, please try again") MessageBox.Show( " Cannot connect to server. 1045: Invalid user name and/or password. The two most common error numbers when connecting are as follows: // 0: Cannot connect to server. When handling errors, you can your application's response based // on the error number. Opening and closing a connection to the database is very simple, however, it's always better to use exception handling before opening a connection or closing it, to catch the errors and deal with them.Ĭopy Code // open connection to database private bool OpenConnection() We should always open a connection before querying our table(s), and close it right after we're done, to release the resources and indicate that this connection is no longer needed. Close connection private bool CloseConnection()

open connection to database private bool OpenConnection() Initialize values private void Initialize()ĬonnectionString = " SERVER=" + server + " " + " DATABASE=" +ĭatabase + " " + " UID=" + uid + " " + " PASSWORD=" + password + " " Ĭonnection = new MySqlConnection(connectionString)