将SQLite中的数据转换为Excel表

将SQLite中的数据转换为Excel表

package zhaoxing.android.tool;


import java.io.File;

import java.io.IOException;

import jxl.Workbook;
import jxl.write.Label;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
import jxl.write.WriteException;
import jxl.write.biff.RowsExceededException;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;

public class DatabaseDump {
	private String mDestXmlFilename;
	private SQLiteDatabase mDb;


	public DatabaseDump(SQLiteDatabase db, String destXml) {
		mDb = db;
		mDestXmlFilename = destXml;
	}

	public void exportData() {

		try {

		//	Log.i("mdb", mDb.getPath());
			// get the tables out of the given sqlite database
			String sql = "SELECT * FROM sqlite_master";

			Cursor cur = mDb.rawQuery(sql, new String[0]);
			cur.moveToFirst();

			String tableName;
			while (cur.getPosition() < cur.getCount()) {
				tableName = cur.getString(cur.getColumnIndex("name"));

				// don't process these two tables since they are used
				// for metadata
				if (!tableName.equals("android_metadata")
						&& !tableName.equals("sqlite_sequence")) {
					writeExcel(tableName);
				}

				cur.moveToNext();
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * 生成一个Excel文件
	 * 
	 * @param fileName
	 *            要生成的Excel文件名
	 */
	public void writeExcel(String tableName) {
		WritableWorkbook wwb = null;
		String fileName;
		fileName = "/sdcard/QuestionData/" + tableName + ".xls";
		int r = 0;

		String sql = "select * from " + tableName;
		Cursor cur = mDb.rawQuery(sql, new String[0]);
		int numcols = cur.getColumnCount();
		int numrows = cur.getCount();
		// Log.i("row", numrows + "");
		// Log.i("col", numcols + "");

		String records[][] = new String[numrows + 1][numcols];// 存放答案，多一行标题行

		if (cur.moveToFirst()) {
			while (cur.getPosition() < cur.getCount()) {
				for (int c = 0; c < numcols; c++) {
					if (r == 0) {
						records[r][c] = cur.getColumnName(c);
						records[r + 1][c] = cur.getString(c);
					} else {
						records[r + 1][c] = cur.getString(c);
					}
				//	Log.i("value" + r + " " + c, records[r][c]);
				}
				cur.moveToNext();
				r++;
			}

			cur.close();
		}
		try {
			// 首先要使用Workbook类的工厂方法创建一个可写入的工作薄(Workbook)对象
			wwb = Workbook.createWorkbook(new File(fileName));
		} catch (IOException e) {
			e.printStackTrace();
		}
		if (wwb != null) {
			// 创建一个可写入的工作表
			// Workbook的createSheet方法有两个参数，第一个是工作表的名称，第二个是工作表在工作薄中的位置
			WritableSheet ws = wwb.createSheet("sheet1", 0);

			// 下面开始添加单元格
			for (int i = 0; i < numrows + 1; i++) {
				for (int j = 0; j < numcols; j++) {
					// 这里需要注意的是，在Excel中，第一个参数表示列，第二个表示行
					Label labelC = new Label(j, i, records[i][j]);
			//		Log.i("Newvalue" + i + " " + j, records[i][j]);
					try {
						// 将生成的单元格添加到工作表中
						ws.addCell(labelC);
					} catch (RowsExceededException e) {
						e.printStackTrace();
					} catch (WriteException e) {
						e.printStackTrace();
					}

				}
			}

			try {
				// 从内存中写入文件中
				wwb.write();
				// 关闭资源，释放内存
				wwb.close();
			} catch (IOException e) {
				e.printStackTrace();
			} catch (WriteException e) {
				e.printStackTrace();
			}
		}
	}
}