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Use the insert(), update(), and delete() methods on the SQLiteDatabase object. These are builder sorts of methods, in that they break down the SQL statements into discrete chunks, then take those chunks as parameters. For example, here we insert() a new row into our constants table:

For this reason, these types of companies are usually not in a hurry to enable their businesses with e-commerce capabilities However, these companies could tweak their Internet presence strategies so that their websites become online brochures, or they could offer customers the option to pay online but then pick up the merchandise at the store location Although the topic of barriers to entry is large enough to fill several chapters, the goal of this section was to outline some of the main challenges you might encounter You ll need to examine every situation on an individual basis and draft a strategy to overcome any such barriers..

delete()

private void processAdd(DialogWrapper wrapper) { ContentValues values=new ContentValues(2); values.put("title", wrapper.getTitle()); values.put("value", wrapper.getValue()); db.insert("constants", "title", values); constantsCursor.requery(); }

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As mentioned, this book will not only give thorough engineering advice on how to build a solid e-commerce infrastructure but will also give information about the actual business aspects of the system. The engineering side will deal with thoroughly planning the system along with designing the database and modeling objects. I will also introduce project management so you can keep your client informed about the progress of the project and so you can efficiently manage your resources. You will use the best tools available for managing this project and building the system.

These methods make use of ContentValues objects, which implement a Map-esque interface, albeit one that has additional methods for working with SQLite types. For example, in addition to get() to retrieve a value by its key, you have getAsInteger(), getAsString(), and so forth. The insert() method takes the name of the table, the name of one column as the null column hack, and a ContentValues with the initial values you want put into this row. The null column hack is for the case where the ContentValues instance is empty. The column named as the null column hack will be explicitly assigned the value NULL in the SQL INSERT statement generated by insert(). The update() method takes the name of the table, a ContentValues representing the columns and replacement values to use, an optional WHERE clause, and an optional list of parameters to fill into the WHERE clause, to replace any embedded question marks ( ). Since update() replaces only columns with fixed values, versus ones computed based on other information, you may need to use execSQL() to accomplish some ends. The WHERE clause and parameter list work akin to the positional SQL parameters you may be used to from other SQL APIs. The delete() method works similar to update(), taking the name of the table, the optional WHERE clause, and the corresponding parameters to fill into the WHERE clause. For example, here we delete a row from our constants table, given its _ID:

Summary

Like update(), delete() receives a Uri representing the instance or collection to work with and a WHERE clause and parameters. If the activity is deleting a single instance, the Uri should represent that instance and the WHERE clause may be null. But the activity might be requesting to delete an open-ended set of instances, using the WHERE clause to constrain which ones to delete. As with update(), though, this is simple if you are using SQLite for database storage (sense a theme ). You can let it handle the idiosyncrasies of parsing and applying the WHERE clause all you have to do is call delete() on the database. For example, here is delete() from Provider: @Override public int delete(Uri url, String where, String[] whereArgs) { int count; long rowId=0; if (isCollectionUri(url)) { count=db.delete(getTableName(), where, whereArgs); }

private void processDelete(long rowId) { String[] args={String.valueOf(rowId)}; db.delete("constants", "_ID= ", args); constantsCursor.requery(); }

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