JDBC的入门

JDBC 即Java Data Base Connectivity,java数据库连接；

步骤一：建立JavaBean

public static Connection getCon(){
String driver = "com.mysql.jdbc.Driver";
String url = "jdbc:mysql://localhost:3306/chatrecord";
String username = "root";
String password = "";
Connection conn = null;
try {
Class.forName(driver);
conn = (Connection) DriverManager.getConnection(url, username, password);
}
catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return conn;
}

步骤二：建立与数据库的连接

public static Connection getCon(){
String driver = "com.mysql.jdbc.Driver";
String url = "jdbc:mysql://localhost:3306/chatrecord";
String username = "root";
String password = "";
Connection conn = null;
try {
Class.forName(driver);
conn = (Connection) DriverManager.getConnection(url, username, password);
}
catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return conn;
}

步骤三：对数据进行增删改查（以增为例）

public static int insert(MessageBean message){

Connection con = getCon();
String sql = "insert into chatrecord(id,message) values (?,?,?);";
PreparedStatement ps = null;
int i = 0;
try{
ps = (PreparedStatement)con.prepareStatement(sql);
ps.setString(1, message.getId());
ps.setString(2, message.getContent());
i = ps.executeUpdate();
ps.close();
con.close();
}catch(SQLException e){
e.printStackTrace();
}
}