MySql的時(shí)間類型有 Java中與之對應(yīng)的時(shí)間類型 date java.sql.Date Datetime java.sql.Timestamp Timestamp java.sql.Timestamp Time java.sql.Time Year java.sql.Date
對其進(jìn)行分析 參考MySql 的reference manual Date: A date. The supported range is '1000-01-01' to '9999-12-31'. html' target='_blank'>MySQL displays DATE values in 'YYYY-MM-DD' format, but allows you to assign values to DATE columns using either strings or numbers. 只記錄日期信息,表示范圍為1000-01-01 至 9999-12-31。 MySql 按照YYYY-MM-DD 的方式進(jìn)行該類字段的顯示。添加該類字段數(shù)據(jù),即可以使用字符串類型,也可以使用數(shù)字類型
由于Date類型的字段只記錄日期信息,所以如果添加的數(shù)據(jù)中包含了時(shí)間信息,該時(shí)間信息將會自動(dòng)被截?cái)唷?br>如果要保存時(shí)間信息,可以考慮使用DateTime類型。 經(jīng)過測試,發(fā)現(xiàn)如下2種方式可以對Date類型字段進(jìn)行填充: 按字符串: insert into time_table(CreateDate) values(‘2007-04-09') 按數(shù)字: insert into time_table(CreateDate) values(20070409) 獲取可以用java.sql.Date類型獲取 代碼為: Date dtDate =rsBuffer.getDate("CreateDate"); 測試代碼如下:(其中,IDBFace 是自己基于JDBC封裝的一個(gè)簡單類, 接受Sql對數(shù)據(jù)庫進(jìn)行操作) 復(fù)制代碼 代碼如下: public void testDate()throws SQLException { IDBFace DBFace =DBFactory.createMySqlFace(); DBFace.connect(); //清空表 String strDelete ="delete from time_table"; DBFace.update(strDelete); //添加
String strInsert ="insert into time_table(CreateDate) values(20070409)"; DBFace.update(strInsert);
//獲取 String strSelect ="select * from time_table"; ResultSet rsBuffer =DBFace.select(strSelect); while(rsBuffer.next()) { Date dtDate =rsBuffer.getDate("CreateDate"); System.out.println(dtDate.toString()); } DBFace.close(); }
執(zhí)行結(jié)果: 2007-04-09
DateTime A date and time combination. The supported range is '1000-01-01 00:00:00' to '9999-12-31 23:59:59'. MySQL displays DATETIME values in 'YYYY-MM-DD HH:MM:SS' format, but allows you to assign values to DATETIME columns using either strings or numbers. DateTime 與Date最主要的區(qū)別在于:DateTime 可以記錄日期和時(shí)間信息。而Date只記錄日期信息。表示范圍為: 1000-01-01 00:00:00 至 9999-12-31 23:59:59 MySql的按照YYYY-MM-DD HH:MM:SS對數(shù)據(jù)進(jìn)行格式化,允許以字符串和數(shù)字的方式提交。
例如以數(shù)字的方式進(jìn)行提交: insert into time_table(CreateDate) values(20070409132013) 獲取該類型的數(shù)據(jù)可以使用:java.sql.Timestamp類型 代碼如下: 復(fù)制代碼 代碼如下: public void testDateTime() throws SQLException { IDBFace DBFace =DBFactory.createMySqlFace(); DBFace.connect(); //清空表 String strDelete ="delete from time_table"; DBFace.update(strDelete); //添加
執(zhí)行結(jié)果: 2007-04-09 13:20:13.0 TimeStamp A timestamp. The range is '1970-01-01 00:00:00' to partway through the year 2037. A TIMESTAMP column is useful for recording the date and time of an INSERT or UPDATE operation. The first TIMESTAMP column in a table is automatically set to the date and time of the most recent operation if you don't assign it a value yourself. You can also set any TIMESTAMP column to the current date and time by assigning it a NULL value. 與DateTime類型非常相似 范圍為1970-01-01 –2037年,精度為1秒/ 如果在Sql中未對Timestamp類型的列賦值,該列將被構(gòu)造成當(dāng)前時(shí)間。 提交NULL值也會使該列以當(dāng)前時(shí)間錄入。 如果時(shí)間提交錯(cuò)誤,該列將被填入0. Timestamp比DateTime 類型所需的存儲空間更小,只需要4個(gè)字節(jié),而DateTime需要8個(gè)字節(jié)。 但是有一點(diǎn)需要特別注意。Timestamp只能表示時(shí)間范圍為1970 -2037. 使用Timestamp一定要確保提交的時(shí)間數(shù)據(jù)一定不會超過這個(gè)范圍。 代碼與DateTime類是,而且我不喜歡用,所以略掉了。 Time: A time. The range is '-838:59:59' to '838:59:59'. MySQL displays TIME values in 'HH:MM:SS' format, but allows you to assign values to TIME columns using either strings or numbers.
Time只記錄時(shí)間信息,不包含日期信息。 范圍為-838:59:59 到 838:59:59, MySql 以HH:MM:SS格式化該數(shù)據(jù),允許輸入為字符串或者數(shù)字。 代碼: 復(fù)制代碼 代碼如下: public void testTime() throws SQLException { IDBFace DBFace =DBFactory.createMySqlFace(); DBFace.connect(); //清空表 String strDelete ="delete from time_table"; DBFace.update(strDelete); //添加
String strInsert ="insert into time_table(CreateTime) values(131211)"; DBFace.update(strInsert); //獲取 String strSelect ="select * from time_table"; ResultSet rsBuffer =DBFace.select(strSelect); while(rsBuffer.next()) { Time tmBuffer =rsBuffer.getTime("CreateTime"); System.out.println(tmBuffer.toString()); } DBFace.close(); }
執(zhí)行結(jié)果: 13:12:11 Year A year in two-digit or four-digit format. The default is four-digit format. In four-digit format, the allowable values are 1901 to 2155, and 0000. In two-digit format, the allowable values are 70 to 69, representing years from 1970 to 2069. MySQL displays YEAR values in YYYY format, but allows you to assign values to YEAR columns using either strings or numbers. The YEAR type is unavailable prior to MySQL 3.22.