JAVA processing time - java.sql.Date.java.util.Date in the Date field in the database conversion method

2010-03-29  来源:本站原创  分类:Java  人气:651 

1, how java.util.Date into a java.sql.Date?
Transformation:

java.sql.Date sd;
java.util.Date ud;
/ / initialize the ud such as ud = new java.util.Date ();

sd = new java.sql.Date (ud.getTime ());

2, if you want to insert into the database and the corresponding field for the Date type then you can use PreparedStatement.setDate (int, java.sql.Date) method which can use the above method of java.sql.Date to be

Database can also be used to provide TO_DATE function, such as the current ud
TO_DATE (new SimpleDateFormat (). Format (ud, "yyyy-MM-dd HH: mm: ss"),
"YYYY-MM-DD HH24: MI: SS")
Note that in java format and database format of the different

A practical example

sql = "update tablename set timer = to_date ( '" + t +"',' yyyymmddhh24miss') where ....."

Where t is the variable to look like: 20051211131223

3, how to "yyyy-mm-dd" format string to convert to java.sql.Date

Method 1

SimpleDateFormat bartDateFormat =
new SimpleDateFormat ( "yyyy-MM-dd");
String dateStringToParse = "2007-7-12";
try (
java.util.Date date = bartDateFormat.parse (dateStringToParse);
java.sql.Date sqlDate = new java.sql.Date (date.getTime ());
System.out.println (sqlDate.getTime ());
)
catch (Exception ex) (
System.out.println (ex.getMessage ());
)

-------------------------------------------------- ----------
Method 2
String strDate = "2002-08-09";
StringTokenizer st = new StringTokenizer (strDate, "-");
java.sql.Date date = new java.sql.Date (Integer.parseInt (st.nextToken ()),
Integer.parseInt (st.nextToken ()),
Integer.parseInt (st.nextToken ()));

similarities and differences between java.util.Date and java.sql.Date
java.sql.Date, java.sql.Time and java.sql.Timestamp three are java.util.Date sub-class (wrapper class).

But why the value of the java.sql.Date type inserted into the database in the Date field in the data interception does occur?

java.sql.Date is to tie in with SQL DATE and set data types. "Normalized" in java.sql.Date contains only date information will be cleared when the minutes and seconds milliseconds. Format similar to: YYYY-MM-DD. When we call the ResultSet of the getDate () method to get the return value, java program will make reference to "norms" of the java.sql.Date to format the database values. Therefore, if the database exists in the non-standardized part of the information will be robbed.

In the sun in this way provides ResultSet.java to comment on the getDate:
Retrieves the of the designated column in the current row of this <code> ResultSet </ code> object as a "java.sql.Date" object in the Java programming language.

By the same token. If we put a java.sql.Date value of the setDate method adopted by PrepareStatement into the database, java process on the incoming java.sql.Date standardized, non-standardized parts will be robbed. However, we generally java.util.Date conversion java.sql.Date over, such as: java.sql.Date sqlDate = new java.sql.Date (new java.util.Date (). GetTime ()).
Obviously, such a transformation over a java.sql.Date is often not a standardized java.sql.Date. To preserve the exact java.util.Date value,
We need to use java.sql.Timestamp.

Calendar

Calendar calendar = Calendar.getInstance ();
/ / Get the current time, time variable declaration
int year = calendar.get (Calendar.YEAR);
/ / Get year
int month = calendar.get (Calendar.MONTH);
/ / Get month, but would like to add a month
month = month +1;
int date = calendar.get (Calendar.DATE);
/ / Get dates
String today = "" + year +"-"+ month +"-"+ date + "";

We are actually used in the project is TimeStamp.toLocaleString () / / converted into 2007-11-19 15:30:00.0 such a format,
When writing sqlproc must add 'TimeStamp.toLocaleString ()'

This article comes from CSDN blog, reproduced please indicate source: http://blog.csdn.net/liaixunhuan/archive/2007/11/19/1893164.aspx

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