integrate barcode scanner into asp net web application Adding Data to Your Database and Deleting It in Objective-C

Creating QR-Code in Objective-C Adding Data to Your Database and Deleting It

Adding Data to Your Database and Deleting It
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You can add one record at a time, one field at a time, or multiple records at once. To add a single record, you use the DB add record command. The following statement adds a single record to the database: set my_db to DB add record {"James", true, 28} to db my_db
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CHAPTER 27 SCRIPTING DATA AND DATABASES
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The DBData property of the ScriptDB object will now be as follows: DBData:{{"James", true, 28}} You can also add multiple records with the DB add records command. You use the DB add records command the same way, only you supply a list of lists, with each sublist representing a database record, like the one shown here: {{"James", true, 28},{"Joan", false, 24},{"Mario", false, 15}} Let s assume you added these three records to the database. To delete a record, you can use the DB delete records command. The DB delete records command can be simple but also powerful. In the following statement, you delete the second record from the database: set my_db to DB delete records from db my_db number 2 To delete multiple records by their number, simply supply a list of records. But what if you want to delete records based on their data For instance, what if you want to delete all the records of people younger than 18 Here s how you d do that: set my_db to DB delete records from db my_db where {"field(age)", "<", 18}
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Finding Data
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ScriptDB allows you to find data subsets that can be returned as a list of lists, as a new ScriptDB object, or as row numbers, representing the rows in which the matching data exists. You do that with the DB get data command, which has some unique parameters for maximum flexibility.
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Narrow the Field
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The first way to restrict your search is by specifying the records and/or fields from which you want the data. This may be all you need to do. For instance, if you want just the second record, you can write this: DB get data from db my_db in records 2 For record ranges, use a string with dashes to specify a range and comma to separate ranges: DB get data from db my_db in records "20-30, 45-55" This can be useful since you can use AppleScript to create the range string on the fly. Use the fields parameter to restrict the returned result to specific fields: DB get data from db my_db fields "age" --> {28, 24, 15} Or specify multiple fields by name or position: DB get data from db my_db fields {1, "married"} --> {{"James", true}, {"Joan", false}, {"Mario", false}} You can also mix the in records and fields parameters, like this: DB get data from db my_db in records "1,2" fields {1, "married"} --> {{"James", true}, {"Joan", false}}
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CHAPTER 27 SCRIPTING DATA AND DATABASES
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Search by Criteria
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The most powerful search option is the use of the where parameter, which is a list describing the test or tests to perform. (Think of it as the ScriptDB scripting addition s equivalent to an application s whose clause.) This list may seem a bit awkward at first, but it does give you some great flexibility for finding data in your ScriptDB database object. The list consists of fields names, math and comparison operators, values, and Boolean operators such as OR and AND. You must write field names and operators as strings. The following are a few examples of searches: DB get data from db my_db where {"field(age)", "<", 55} And also the following: DB get data from db my_db where {{"field(married)", "=", false}, "AND", {"field(age)", ">", 18}} Now, match that with the previous parameters, in records and fields, and you can pinpoint any data in your lists. For instance, to get the name of the only single person older than 21 in the database, use the following search: DB get data from db my_db fields "first name" where {{"field(married)", "=", false}, "AND", {"field(age)", ">", 18}} --> {"Joan"}
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