利用SimpleDateFormat 和MessageFormat 向資料庫中插入yyyy-mm-dd 和yyyy-MM-dd HH:mm:ss的日期格式

SimpleDateFormat dateFm = new SimpleDateFormat("yyyy-MM-dd"); //格式化當前系統日期
qds.setDate("制單日期", Date.valueOf(dateFm.format(new java.util.Date())));

此種情況資料庫的欄位為Date型

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String 制單日期 = MessageFormat.format("{0,date,yyyy-MM-dd HH:mm:ss}", new Object[] { new java.sql.Date(System.currentTimeMillis()) });
qds.setTimestamp("制單日期", Timestamp.valueOf(制單日期)); // 不能強行轉換

此種情況資料庫的欄位為Timestamp(6)型

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附：幾個Date類的valueOf()方法

1. java.sql.Date.valueOf(java.lang.String)

    public static Date valueOf(String s)
 Converts a string in JDBC date escape format to a Date value.

 Parameters:
 s - a String object representing a date in in the format "yyyy-mm-dd"
 Returns:
 a java.sql.Date object representing the given date
 Throws:
 IllegalArgumentException - if the date given is not in the JDBC date escape format (yyyy-mm-dd)

2. java.sql.Time.valueOf(java.lang.String)

    public static Time valueOf(String s)
 Converts a string in JDBC time escape format to a Time value.

 Parameters:
 s - time in format "hh:mm:ss"
 Returns:
 a corresponding Time object

3. java.sql.Timestamp.valueOf(java.lang.String)
  
   public static Timestamp valueOf(String s)
 Converts a String object in JDBC timestamp escape format to a Timestamp value.

 Parameters:
 s - timestamp in format yyyy-mm-dd hh:mm:ss.fffffffff
 Returns:
 corresponding Timestamp value
 Throws:
 IllegalArgumentException - if the given argument does not have the format yyyy-mm-dd hh:mm:ss.fffffffff