Microsoft SQL Server CE in .NET framework

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63 Microsoft SQL Server CE
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very important Historically, database engines have always provided a method for querying information about a database schema, such as the names of the tables, the names and data types of the columns, and the names and included columns of the primary keys and foreign keys Thedatabaseenginesalldidthisdifferently,mainlybecausetheirinternal storage mechanisms for holding this information varied from engine to engine To improve cross-engine compatibility, the ANSI Standards Committee introduced a standard syntax for querying schema information, known as the INFORMATION_SCHEMA views For instance, using this syntax you can query the database for a list of table names by submitting the following query:
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SELECT TABLE_NAME FROM Information_SchemaTABLES WHERE TABLE_TYPE = 'TABLE'
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SQL Server CE schema querying capability differs significantly from that of SQL Server and from the ANSI standard This is necessary to maintain the smaller footprint of SQL Server CE Many of the ANSI standard tables related to constraints have been removed and replaced by a single table that is more appropriate for a single-user database: the MSysConstraints table For instance, the following ANSI standard query obtains foreign key information when submitted to SQL Server; but it yields a syntax error when submitted to SQL Server CE:
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--*** --*** --*** SELECT , , , , FROM JOIN ON JOIN ON SQL Server version CCONSTRAINT_NAME PKTABLE_NAME PKCOLUMN_NAME FKTABLE_NAME FKCOLUMN_NAME Information_SchemaREFERENTIAL_CONSTRAINTS C Information_SchemaCONSTRAINT_COLUMN_USAGE PK PKCONSTRAINT_NAME = CUNIQUE_CONSTRAINT_NAME Information_SchemaCONSTRAINT_COLUMN_USAGE FK FKCONSTRAINT_NAME = CCONSTRAINT_NAME
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Instead, the following query must be used with SQL Server CE to obtain foreign key information:
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--*** --*** SQL Server CE version
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--*** SELECT CCONSTRAINT_NAME , CREFERENCED_TABLE_NAME , CREFERENCED_COLUMN_NAME , CTABLE_NAME , CCONSTRAINT_COLUMN_NAME FROM MSysConstraints C WHERE CCONSTRAINT_TYPE = 1
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In the world of SQL Server CE, schema queries are very useful tools As we discuss in 8, the data in your SQL Server CE database may have been imported from a connected database such as SQL Server You mayneedtoascertainschemainformationafterthedatahasbeenreceived Additionally, as you move data from your SQL Server CE database into a data set, you may wish to reproduce the database schema, such as constraints and relationships, into the data set As an example of querying schema information, the UtilData class located in the UtilData project on the book s Web site has a shared method, BuildDataSet, which does the following:
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Creates a data set Finds all the tables in a specified SQL Server CE database Uploads them to the data set Finds all the constraints in the specified SQL Server CE database Creates the corresponding relations and constraints in the data set Returns the data set
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Listing 610 presents the code
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Listing 610: Building a Data Set from a Database
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public static DataSet BuildDataSet( string { DataSet dsetWork; strDB )
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if (! FileExists(strDB) ) { return(null) ; } string strConn = "Data Source=" + strDB; SqlCeConnection connDB; connDB = new SqlCeConnection(strConn); connDBOpen(); dsetWork = new DataSet("ourProduceCo");
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63 Microsoft SQL Server CE
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SqlCeDataReader drdrTableNames; drdrTableNames = GetTableNames(connDB); while ( drdrTableNamesRead() ) { LoadTable(dsetWork, connDB, drdrTableNamesGetString(0)); } drdrTableNamesClose(); LoadRelationships(dsetWork, connDB); connDBClose(); return dsetWork; }
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// *****************************************************// // // GENERIC ROUTINES // public static SqlCeDataReader GetTableNames ( SqlCeConnection connDB ) { SqlCeCommand cmndDB = new SqlCeCommand(strGetTableNames, connDB); return cmndDBExecuteReader(); } public static void LoadTable (DataSet dsetDB, SqlCeConnection connDB, string strTable) { SqlCeCommand cmndDB = new SqlCeCommand(strGetTableRows + strTable, connDB); SqlCeDataAdapter daptProducts = new SqlCeDataAdapter(cmndDB); daptProductsFill(dsetDB, strTable); } public static SqlCeDataReader GetRelationships ( SqlCeConnection connDB ) { SqlCeCommand cmndDB = new SqlCeCommand(strGetRelationships, connDB); return cmndDBExecuteReader();
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public static void LoadRelationships( DataSet dsetDB, SqlCeConnection connDB) { // Retrieve foreign key information from the // database For each foreign key, create // a relationship in the data set // Create the GetRelationships command object SqlCeCommand cmndDB = new SqlCeCommand(strGetRelationships, connDB); // Execute GetRelationships SqlCeDataReader drdrRelationships; drdrRelationships = cmndDBExecuteReader(); string strRelation; DataColumn dcolParent, dcolChild; while ( drdrRelationshipsRead() ) { // For each foreign key in the database // Extract and convert name, parent, child info strRelation = drdrRelationshipsGetString(0); dcolParent = dsetDBTables[drdrRelationshipsGetString(1)] Columns[drdrRelationshipsGetString(2)]; dcolChild = dsetDBTables[drdrRelationshipsGetString(3)] Columns[drdrRelationshipsGetString(4)]; // Add the relation to the data set dsetDBRelationsAdd (strRelation, dcolParent, dcolChild); } drdrRelationshipsClose(); // Make each relationship a nested relationship foreach( DataRelation drelForXML in dsetDBRelations ) { drelForXMLNested = true; } }
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