CacheManager

曾经终败给现在 2022-07-28 00:10 138阅读 0赞

package com.companyname.transport.util.db;  
  
import android.content.ContentValues;  
import android.database.Cursor;  
import android.database.SQLException;  
import android.database.sqlite.SQLiteDatabase;  
import com.companyname.util.log.companynameLog;  
import java.text.SimpleDateFormat;  
import java.util.Calendar;  
import java.util.Date;  
import java.util.GregorianCalendar;  
  
public class CacheManager \{  
    public static String getCacheByUrl(SQLiteDatabase sqLiteDatabase, String cacheUrl) \{  
        Cursor cursor = null;  
        try \{  
            String sql = "SELECT  cacheData FROM cache WHERE cacheUrl='" + cacheUrl + "'"  
                    + " ORDER BY " + "cacheTime" + " DESC";  
            companynameLog.i("getCacheByUrl:" + sql);  
            cursor = sqLiteDatabase.rawQuery(sql, null);  
  
            int cacheDateIndex = cursor.getColumnIndex("cacheData");  
            String cacheData = "";  
            for (cursor.moveToFirst(); !(cursor.isAfterLast()); cursor.moveToNext()) \{  
                cacheData = cursor.getString(cacheDateIndex);  
            \}  
  
            cursor.close();  
            companynameLog.i(cacheUrl + "=" + cacheData);  
            return cacheData;  
        \} catch (Exception e) \{  
            companynameLog.e(e.getMessage());  
            cursor.close();  
        \}  
        return null;  
    \}  
  
    public static void updateCacheByUrl(SQLiteDatabase sqLiteDatabase, String cacheUrl,  
            String cacheData) \{  
        try \{  
            String pattern = "yyyy-MM-dd HH:mm:ss";  
            SimpleDateFormat sdf = new SimpleDateFormat(pattern);  
            String cacheTime = sdf.format(new Date());  
  
            String sql = "UPDATE cache SET cacheData='" + cacheData + "'," + "cacheTime" + "='"  
                    + cacheTime + "' WHERE " + "cacheUrl" + "='" + cacheUrl + "'";  
            companynameLog.i("updateCacheByUrl:" + sql);  
            sqLiteDatabase.execSQL(sql);  
        \} catch (SQLException e) \{  
            companynameLog.e("updateCacheByUrl:" + e.getMessage());  
        \}  
    \}  
  
    public static void insertCache(SQLiteDatabase sqLiteDatabase, String cacheUrl, String cacheData) \{  
        try \{  
            String pattern = "yyyy-MM-dd HH:mm:ss";  
            SimpleDateFormat sdf = new SimpleDateFormat(pattern);  
            String cacheTime = sdf.format(new Date());  
  
            ContentValues cv = new ContentValues();  
            cv.put("cacheData", cacheData);  
            cv.put("cacheUrl", cacheUrl);  
            cv.put("cacheTime", cacheTime);  
            sqLiteDatabase.insert("cache", null, cv);  
        \} catch (Exception e) \{  
            companynameLog.e(e.getMessage());  
        \}  
    \}  
  
    public static void cleanCacheByDate(SQLiteDatabase sqLiteDatabase, int days) \{  
        try \{  
            GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();  
            gc.setTime(new Date());  
            gc.add(5, -days);  
            SimpleDateFormat vSimpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");  
            String strTime = vSimpleDateFormat.format(gc.getTime());  
  
            String sql = "DELETE FROM cache WHERE cacheTime < '" + strTime + "'";  
            companynameLog.i("cleanCacheByDate:" + sql);  
            sqLiteDatabase.execSQL(sql);  
        \} catch (SQLException e) \{  
            companynameLog.e("cleanCacheByDate:" + e.getMessage());  
        \}  
    \}  
\}