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Figure 8-9. SQL Compare following synchronization We can also use the command line to perform the same operations. The command-line tool comes with an enormous amount of switches and parameter possibilities and so is easiest to use when performing regular activities such as quick comparisons. We can use the command shown in Figure 8-10 to perform a comparison between the two databases.
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Figure 8-10. SQL Compare command line
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As can be seen, the databases are fully synchronized, as we would expect from the efforts using the SQL Compare GUI.
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The APIs for SQL Compare and the other tools in the bundle are well documented, and there are also useful code samples that demonstrate how to synchronize databases. While the previous task is useful, effectively it is simply ordering and executing a series of SQL scripts. It is flexible and can be used as needed in whatever database scenario we have. This time, since we are expecting SQL Compare to do all of the work in terms of script production as well as synchronization, we need to think a little about what the deliverables from the process should be. In terms of sensible assets to maintain for a build, we should probably maintain a full CREATE script for the database in the current build and then also maintain the migration necessary for a move from the prior build to the current one. With these two assets, we can then synchronize the integration environments or create a new integration environment as desired. We should also consider that, as discussed previously, we may wish to synchronize multiple database instances, though we may only want to maintain synchronization assets for one of the instances; after all, the databases should be the same. With these points in mind, the following task would be useful: <dbAutoIntegrate folder="D:\BookCode\8\DBTest2\" server="localhost" database="TestDB-Development" uid="sa" pwd="w1bbl3" write="true" caption="0" > <databases> <database server="localhost" database="TestDB-Integration" uid="sa" pwd="w1bbl3" write="true"/> <database server="localhost" database="TestDB-System" uid="sa" pwd="w1bbl3" write="true"/> </databases> </dbAutoIntegrate> The task will have a few features. The attributes in the main element contain the standard four pieces of database information (server, database, username, and password) as well as three other pieces of information: folder is the folder in which the scripts should be stored when produced, write tells the task whether to produce a script for that particular step (in the case of the main element, whether to produce the CREATE script), and caption allows us to pass through information to assist in the naming of the produced scripts (we would ordinarily pass through the build number). The task is a little more complicated by the inclusion of child elements describing multiple target databases for synchronization. In the previous example I have included the regular integration database and also a System Test database server. I have marked both to have the
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scripts produced, but in fact I would probably only maintain the migration scripts for the integration database. We will make a new type to represent these child elements in the main task. We will call this new type DBInfo. It will be a custom NAnt element that we will create to hold the information for each target database. Implementing the DBInfo type is straightforward (in fact, thinking of a name for the type was harder since the SQL Compare APIs use Database): [ElementName("database")] public class DBInfo : Element { private string _server; private string _database; private string _username; private string _password; private bool _write; [TaskAttribute("server", Required=true)] public string Server { get{return _server;} set{_server = value;} } [TaskAttribute("database", Required=true)] public string Database { get{return _database;} set{_database = value;} } [TaskAttribute("uid", Required=true)] public string Username { get{return _username;} set{_username = value;} } [TaskAttribute("pwd", Required=true)] public string Password { get{return _password;} set{_password = value;} } [TaskAttribute("write", Required=true), BooleanValidator()] public bool Write {
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