10_传智播客JDBC_jdbc中的数据类型与日期问题

java.sql.Date; java.sql.Time; java.sql.Timestamp 都是继承于 java.util.Date

java.sql 关于时间的类型 对应于数据库的字段类型（Type）。

这样 就会存在于 一个转换关系

package five.base;

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

import five.utils.UtilsSingle;

public class DateTest {

/**
* @param args
* @throws SQLException
*/
public static void main(String[] args) throws SQLException {

//create(100, "name1", new Date(), 1000.58f, "sssssssss");
read("name1");
}

public static void create(Integer id, String name, Date brithday,
float money, String password) throws SQLException {
Connection connection = null;
PreparedStatement preparedStatement = null;
ResultSet resultSet = null;

UtilsSingle util = UtilsSingle.getUtilsSingleInstance();
try {
connection = util.getConnection();
String sql = "insert into user (id, name, brithday, monny, password) value (?,?,?,?,?)";
preparedStatement = connection.prepareStatement(sql);
preparedStatement.setInt(1, id);
preparedStatement.setString(2, name);

// java.sql.Date; java.sql.Time; java.sql.Timestamp 都是继承于 java.util.Date
// 所以 要将子类转成父类
preparedStatement.setDate(3, new java.sql.Date(brithday.getTime()));

preparedStatement.setFloat(4, money);
preparedStatement.setString(5, password);
int i = preparedStatement.executeUpdate();
System.out.print("rs is " + i);
} finally {
util.free(connection, preparedStatement, resultSet);
}
}

static void read(String name) throws SQLException{

PreparedStatement ps = null;
ResultSet rs = null;
UtilsSingle instance = UtilsSingle.getUtilsSingleInstance();

// 1 创建连接
Connection connection = instance.getConnection();
try {

// 2 创建语句
String sql = "select *from user where name = ?";
ps = connection.prepareStatement(sql);
// 向占位符 设置参数
ps.setString(1, name);
rs = ps.executeQuery();
// 5 处理结果
while (rs.next()) {
// sql.Date-->util.Date
Date brithDate = new Date(rs.getDate("brithday").getTime());
System.out.print(brithDate);

//sql.Date 有格式化输出
brithDate = rs.getDate("brithday");
System.out.print(brithDate);
}
} finally {
instance.free(connection, ps, rs);
}
}

}

public String toString () {
int year = super.getYear() + 1900;
int month = super.getMonth() + 1;
int day = super.getDate();

char buf[] = "2000-00-00".toCharArray();
buf[0] = Character.forDigit(year/1000,10);
buf[1] = Character.forDigit((year/100)%10,10);
buf[2] = Character.forDigit((year/10)%10,10);
buf[3] = Character.forDigit(year%10,10);
buf[5] = Character.forDigit(month/10,10);
buf[6] = Character.forDigit(month%10,10);
buf[8] = Character.forDigit(day/10,10);
buf[9] = Character.forDigit(day%10,10);

return new String(buf);
}