* Connection : 连接数据库并担任传送数据的任务
* Statement : 执行SQL语句
* ResultSet ：保存Statement执行后产生的查询结果
1.注册驱动
Class.forName（JDBC驱动类）；
2.获取数据库连接
Connection con=DriverManager.getConnection（JDBC url，数据库用户名，密码）；
3.获得 Statement对象
Statement stmt=con.createStatement();
4.执行SQL语句
ResultSet rs=stmt.executeQuery（select a，b from table）；
5.处理执行结果
while（rs.next()）{
int x=rs.getInt（"a"）；
String s=rs.getString（"b"）；
*数据类型要相匹配
}
6.释放资源
1.rs.close();
2.stmt.close();
3.con.close();
*顺序倒过来依次关闭
实例：
Java使用PreparedStatement接口插入数据库信息
public class PreparedStatementDemo01 {
public static final String DBDRIVER = "org.gjt.mm.mysql.Driver";
public static final String DBURL = "jdbc:mysql://localhost:3306/";
public static final String DBUSER = "root";
public static final String DBPASS = "root";
public static void main(String args[]) throws ParseException, ClassNotFoundException, SQLException
{
Connection conn = null; //数据库连接
PreparedStatement pstmt = null; //数据库操作
Statement stmt = null;
ResultSet rs = null; //Rs接口
String name = "黄鹏";
String password = "1598741";
int age = 21;
String sex = "男";
String birthday ="1992-04-30";
Date temp = null;
temp = new SimpleDateFormat("yyyy-MM-dd").parse(birthday);
java.sql.Date bri = new java.sql.Date(temp.getTime());
//创建数据库操作语句
String sql1 = "CREATE DATABASE MyDemo;";
//选择使用哪个数据库的语句
String sql2 = "USE MyDemo;";
//创建数据库表操作语句
String sql3 = "CREATE TABLE user(name varchar(20) primary key,password varchar(20),age int,sex varchar(10),birthday Date);";
//查询数据库语句
String sql5 = "select * from user;";
//用PreparedStatement执行的插入语句
String sql4 = "INSERT INTO user(name,password,age,sex,birthday) VALUES(?,?,?,?,?);";
//加载驱动程序
Class.forName(DBDRIVER);
//连接mysql数据库
conn = DriverManager.getConnection(DBURL,DBUSER,DBPASS);
//实例化PreparedStatement
pstmt = conn.prepareStatement(sql4);
//设置第一个?内容
pstmt.setString(1, name);
//设置第二个?内容
pstmt.setString(2, password);
//设置第三个?内容
pstmt.setInt(3, age);
//设置第四个?内容
pstmt.setString(4,sex);
//设置第五个?内容
pstmt.setDate(5, bri);
//执行数据库更新，不需要sql
stmt = conn.createStatement();
stmt.execute(sql1);
stmt.execute(sql2);
stmt.execute(sql3);
pstmt.executeUpdate();
rs = stmt.executeQuery(sql5);
//向控制台输出信息
while(rs.next())
{
String QueryName = rs.getString("name");
String QueryPwd = rs.getString("password");
int QueryAge = rs.getInt("age");
String QuerySex = rs.getString("sex");
Date QueryDate = rs.getDate("birthday");
System.out.println("name:"+QueryName+" pwd:"+QueryPwd+" "+QueryAge+" sex:"+QueryPwd+" date:"+QueryDate);
}
pstmt.close();
conn.close();
}
}