判断sqlite 是否存在表

Cursor cursor = null;  
    try {  
    boolean result = false;
        String sql = "select count(*) as c from sqlite_master where type ='table' and name ='" + tabName.trim() + "' ";  
        cursor = db.rawQuery(sql,null);  
        if (cursor.moveToNext()) {  
            int count = cursor.getInt(0);  
            if (count > 0) {  
                result = true;  
            }  
        }  

    } catch (Exception e) {  
        // TODO: handle exception  
    }