Implementation of Excel data and sqlite3 data in Java

Java and Excel are connected to the Jxl.jar open source package, and SQLite3 connection with the Sqlitejdbc-v056.jar this open source package, two open source package download: Portal

If you are using Eclipse to do development, after decompression, import two open source packages as shown below:

Right-click on the project >build Path>add External Archives, and then select the two open source package to introduce.

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1,java connection to Excel:

(source code of Jxl.jar Open source package, and download using API: Portal)

Java and Excel connection, simply introduce JXL related packages (see the bottom source code), you can achieve the connection with Excel files;

The code is as follows

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String s = ""; File File = new file ("D:\hello\1.xls"); Workbook wb = Workbook.getworkbook (file); Create a WB for a workbook object that refers to an Excel file to be read Sheet Sheet = wb.getsheet (0); Create a Worksheet object in the WB of a workbook (0 represents the first worksheet, the workbook, the worksheet relationship, just like the relationship between an accounting book and a sheet on the ledger) int strows = Sheet.getrows (); Gets the number of all non-null rows in the current worksheet; for (int i=0;i<strows;i++) { Cell cell = Sheet.getcell (j, I); Creates a cell object that holds the cells read from the sheet (column J, line i); S + + cell.getcontents (); The cell. getcontents () method obtains a string that has been converted to a string type from the current cell object, such as the need to acquire prototypes (such as shaping data), and the related methods in the Self-Examination API; }

When you are finished, use the Wb.close () method to close the file stream.

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2,java connection to SQLite3:

Java connections to SQLite3, as well as writing data, require the following preparatory work:

1, through the Class.forName () method, load the class that needs to connect to the database

The code is as follows	Copy Code
Class cl = class.forname ("Org.sqlite.JDBC");

If you want to understand the meaning of this method 2, then establish a connection with the database, the code is as follows:

The code is as follows

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The connection is established through Jdbc:sqlite with the allclasses.db file (SQLite3 database file) in the D:\123 directory; Connect conn = drivermanager.getconnection ("jdbc:sqlite:d:/123/allclasses.db"); Statement stm =conn.createstatement (); The following SQL statement means: If the database does not have "otherclasses" This table, it is created; With the addition of kc_id, a total of nine data; Stm.executeupdate ("CREATE table if not exists otherclasses (" + "kc_id Integer primary Key autoincrement," + "Kc_name Vachar," + "Kc_teacher Vachar (5)," + "Kc_classes Vachar (Ten)," + "Kc_room Vachar (6)," + "Kc_endtime Vachar (5)," + "Kc_yuanxi Vachar (4)," + "Kc_position Vachar (3)," + "Kc_mark Vachar (3));"); /* PreparedStatement class, in layman's terms, is just like the BufferedReader of a file stream, except that it is used to hold the buffer content of the SQL statement (if you have the energy to refer to the Java API), * 1,preparedstatement PRS = conn.preparestatement ("INSERT into otherclasses values (?,?,?,?,?,?,?,?,?);"); * This sentence is used to predefined a list of data specifications that you are about to insert, as in the previous method, which means that I am prepared to hold 9 data to be inserted each time (9 question marks); * 2,prs's SetString () is used to set the contents of the SQL statement, a total of nine parameters, SetString (2, "Nihao") that is, set the second data to be inserted by the bank is "Nihao" (starting from 2, a total of 9 data, why not start from 1?) Because 1 is "kc_id Integer primary Key AutoIncrement", it will increase according to the bank's data, no need to assign value); * 3, a set of nine sets of data after the completion of the Prs.addbatch () method, the batch command added to the PRS, * 4, through Conn.setautocommit (false); Prs.executebatch (); Conn.setautocommit (True), these three methods can execute a command of a batch of SQL cached in PRS, execute it, and insert the previous set of nine data into the database file. */ PreparedStatement PRS = conn.preparestatement ("INSERT into otherclasses values (?,?,?,?,?,?,?,?,?);"); The following code allows you to insert a column of data; Why start at 2? Because the first data is the self-amplification counter, as detailed in the 2nd above explanation; for (int i = 2; i<9; i++) { Prs.setstring (i, "this insertion" + i); } Prs.addbatch (); Conn.setautocommit (FALSE); Prs.executebatch (); Conn.setautocommit (TRUE);

The above code, after three consecutive times, the effect of the following figure

(Friends of the SQLite3 database browser who want this graphical interface,):