JDBC中对数据类型（如：日期）的转换

java.sql.Date是java.util.Date的子类，转换时需注意。

package jdbc;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.Date;

/**
 *
 * @author HaoWang
 */
public class DateTest {
    public static void main(String[] args) {
//        create(4,"wanghao",true,java.sql.Date.valueOf("1987-11-02"),200.3f);
        create(4,"wanghao",true,new Date(),200.3f);
        read(4);
    }
    public static void create(int sid, String name, boolean sex, Date birthday, Float money) {
        Connection conn = null;
        PreparedStatement ps = null;
        ResultSet rs = null;
        String sql = null;
        try {
            conn = JdbcUtils.getConnection();
            sql = "insert into students(sid,name,sex,birthday,money) value (?,?,?,?,?)";
            ps = conn.prepareStatement(sql);
            ps.setInt(1, sid);
            ps.setString(2, name);
            ps.setBoolean(3, sex);
            ps.setDate(4, new java.sql.Date(birthday.getTime()));
            ps.setFloat(5, money);
            int i = ps.executeUpdate();
            System.out.println("i="+i);
        } catch (Exception ex) {
            System.out.println(ex.toString());
        } finally {
            JdbcUtils.free(conn, ps, rs);
        }
    }
    public static void read(int sid) {
        Connection conn = null;
        PreparedStatement ps = null;
        ResultSet rs = null;
        String sql = null;
        try {
            conn = JdbcUtils.getConnection();
            sql = "select birthday from students where sid=?";
            ps = conn.prepareStatement(sql);
            ps.setInt(1, sid);
            rs = ps.executeQuery();
            while(rs.next()) {
                System.out.println(rs.getObject(1));
            }
        } catch (Exception ex) {
            System.out.println(ex.toString());
        } finally {
            JdbcUtils.free(conn, ps, rs);
        }
    }
}