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The preceding examples have demonstrated how you can set the SGDropTables and SchemaGen attributes to True to force the bulk load process to first drop the target tables and then to generate them using information in the mapping schema file. SGUseID can only be used when the SchemaGen property is set to True. If SGUseID is set to True, the component will set, as primary key on the new table, the column with dt:type="id" in the mapping schema. The default is False. BulkLoad is used in scenarios in which you want to use the object with SchemaGen and SGDropTables set to True, just to re-create tables. If it is set to False, the component will not load the document. By default, it is set to True.
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15: Modifying Databases Using SQLXML
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In the case of a nontransactional load, the BulkLoad component creates and executes an Insert statement as soon as it parses an element. In the case of a transactional load, it first writes data to a set of temporary files it creates a separate file for each table involved. These temporary files will later be loaded into the permanent tables in a single transaction. You must set the Transaction property to True if you want to force the BulkLoad component to roll back the transaction in case of an error. The TempFilePath property is used to specify the folder that will be used to store the temporary data files. These files are needed when BulkLoad component is set to load data within a transaction. If a value is not specified, the process will use the folder specified in the TEMP environment variable. Naturally, there should be enough space in that folder, and the user account that is used to run the bulk load process must have appropriate privileges for that folder.
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You should not attempt to load records with binary and image columns (with XML data types such as bin.hex and bin.base64) in a transaction.
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The CheckConstraints property is used when data needs to be loaded and verified at the same time against constraints such as foreign keys and unique indexes. By default, this property is set to False. Alternatively, you could load the file with CheckConstraints set to False to speed up the load and then use DBCC CHECKCONSTRAINTS to verify the records. The KeepIdentity property controls how SQL Server handles identity values during the bulk load operation. If it is set to False, SQL Server ignores records supplied in the XML document and assigns the identity values. The default value is True, in which case SQL Server preserves the values specified in the XML document. (It is equivalent to Set Identity_Insert On.)
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Unfortunately, you will not be able to set BulkLoad to insert a parent record, obtain the identity value generated, and then use it in a child record. If that is required, you will have to convert your XML document to an UpdateGram, but you will pay a severe performance penalty.
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KeepNulls controls how values are set for attributes and subelements that are missing in the XML document. If you set this attribute to True, the BulkLoad component will assign null values to them. The default value is False and, in that case, values will be assigned by SQL Server using constraints defined on the column (such as default and null). IgnoreDuplicateKeys can only be used when the Transaction property is set to False. It forces the BulkLoad component to regard the existence of duplicate keys in the XML document as a nonfatal error.
Table Lock
By default, BulkLoad component acquires and releases an exclusive lock during each record insertion. If you set ForceTableLock to True, you will improve the performance of the load operation by putting an exclusive lock on each database table for the duration of the load. Keep in mind that this also prevents other processes from both reading and modifying data in the tables during the load.
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