JDBC add, update, delete data

JDBC add, update, delete data

st.executeUpdate(sql) insert, update, delete operation
returns the number of affected records

Note: In the input sql statement, remember to add single quotes for the vachar type

The complete code is as follows:

public  class JDBCTest {
     // establish a connection 
    public  static Connection getConnection(){
        Connection conn=null;
        try {
            Class.forName("com.mysql.cj.jdbc.Driver").newInstance();
            conn=(Connection)DriverManager.getConnection("jdbc:mysql://localhost:3306/test?useSSL=FALSE&serverTimezone=UTC","root","xb199795");
        } catch (InstantiationException | IllegalAccessException | ClassNotFoundException | SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return conn;
    }
    // Insert data 
    public  static  void insert() {
        String sql="insert into tbl_user(name,password,email)"+
                   "values('xiongda','123','[email protected]')";
        Connection conn =getConnection();
        try {
            Statement st=conn.createStatement();
            int count =st.executeUpdate(sql);
            System.out.println( "Insert "+count+" records!" );
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    // Update data 
    public  static  void update() {
        String sql="update tbl_user set email='[email protected]' where name='xiongda'";
        Connection conn =getConnection();
        try {
            Statement st=conn.createStatement();
            int count =st.executeUpdate(sql);
            System.out.println( "Updated "+count+" records!" );
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    // delete data 
    public  static  void delete() {
        String sql="delete from tbl_user where name='xiongda'";
        Connection conn =getConnection();
        try {
            Statement st=conn.createStatement();
            int count =st.executeUpdate(sql);
            System.out.println( "Deleted "+count+" records!" );
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}