Work with JDBC in Java.(for students)
Work with databases in Java. JDBC Tutorial for students of universities
Author: Dudnik Oxana The JDBC API — The JDBC™ API provides programmatic access to relational data from the Java™ programming language. JDBC Architecture Two-tier Processing Models JDBC Architecture Three-tier Processing Models Get connection with database static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
static final String DB_URL = "jdbc:mysql://localhost/EMP";
static final String USER = "username";
static final String PASS = "password";
public Connection getConnection() throws SQLException {
Connection conn = null;
try
{ //Register JDBC driver
Class.forName("com.mysql.jdbc.Driver");
//Open a connection
System.out.println("Connecting to database...");
conn = DriverManager.getConnection(DB_URL, USER, PASS);
System.out.println("Connected to database");
}catch(Exception e){
e.printStackTrace();
}
return conn;
} Statement. Execute a query Statement stmt = null;
try{
System.out.println("Creating statement...");
stmt = conn.createStatement();
String sql = "SELECT id, first, last, age FROM Employees";
ResultSet rs = stmt.executeQuery(sql);
// Extract data from result set
while(rs.next()){ //Retrieve by column name
int id = rs.getInt("id");
int age = rs.getInt("age");
String first = rs.getString("first");
String last = rs.getString("last");
//Display values
System.out.print("ID: " + id);
System.out.print(", Age: " + age);
System.out.print(", First: " + first);
System.out.println(", Last: " + last); }
//Clean-up environment
rs.close();
stmt.close();
}catch(SQLException se)
{se.printStackTrace();}
PrepareStatement. PreparedStatement ps = conn.prepareStatement("insert into flowers_table values(?,?)");
int a = 1;
String b = "rose";
ps.setString(1,a);
ps.setString(2,b);
ps.executeUpdate() ; Literature http://www.quizful.net/post/using-jdbc
http://www.javaportal.ru/java/articles/JDBC_java_BD.html