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CHAPTER 7 ROWSET METADATA
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Alternatively, you can populate the WebRowSet object from a ResultSet object: // load MySQL JDBC Driver and return a connection Connection conn = VeryBasicConnectionManager.getConnection("mysql"); // use a statement to gather data from the database Statement stmt = conn.createStatement(); String query = "SELECT id, name, age FROM employees"; WebRowSet wrs = new WebRowSetImpl(); // execute the query ResultSet resultSet = stmt.executeQuery(query); wrs.populate(rs);
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Getting RowSetMetaData from a WebRowSet Object
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After populating a WebRowSet object, you can get its metadata by using this code: import javax.sql.RowSetMetaData; RowSetMetaData rsMetaData = (RowSetMetaData) wrs; If (rsMetaData == null) { // db vendor does not support WebRowSet's metadata } else { // db vendor does support WebRowSet's metadata // you may invoke RowSetMetaData methods int numberOfColumns = rsMetaData.getColumnCount(); }
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Updating a WebRowSet Object
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To update a WebRowSet object, you may update your desired rows (by using WebRowSet. updateXXX() methods) and then invoke the WebRowSet.acceptChanges() method. The following code fragment updates the first two rows in the WebRowSet object wrs: // wrs is initialized with its original and current values wrs.execute(); // set the cursor to the first row wrs.first(); wrs.updateString(2, "Jane Doe"); wrs.updateInt(3, 45); wrs.updateRow(); // the current value of the first row has been updated
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CHAPTER 7 ROWSET METADATA
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// set the cursor to the second row wrs.relative(1); wrs.updateString(2, "Toni Duncan"); wrs.updateInt(3, 55); wrs.updateRow(); // the current value of the second row has been updated wrs.acceptChanges(); // the original value has been set to the current value // and the database has been updated
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Representing a WebRowSet Object as an XML Object
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Writing a WebRowSet object to an XML document can be accomplished by using the WebRowSet.writeXml() method, which can take either an OutputStream object (if we want to write in bytes) or a Writer object (if we want to write in characters). This code snippet writes to a file called emps.xml using a FileWriter object: String filename = "c:\\myrowset\\emps.xml"; // Windows // String filename = "/home/alex/myrowset/emps.xml"; // UNIX java.io.FileWriter writer = new java.io.FileWriter(filename); wrs.writeXml(writer); The created emps.xml file will have three sections: Properties Metadata Data A generated XML document will contain a properties section, which will contain information about our connection, including the command associated with our WebRowSet object SELECT id, name, age FROM employees as well as other important information. The properties section of a WebRowSet object is depicted here (extracted from emps.xml): <properties> <command>SELECT id, name, age FROM employees</command> <concurrency>1008</concurrency> <datasource><null/></datasource> <escape-processing>true</escape-processing> <fetch-direction>1000</fetch-direction> <fetch-size>0</fetch-size> <isolation-level>2</isolation-level> <key-columns></key-columns> <map></map> <max-field-size>0</max-field-size> <max-rows>0</max-rows> <query-timeout>0</query-timeout> <read-only>true</read-only>
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CHAPTER 7 ROWSET METADATA
<rowset-type>ResultSet.TYPE_SCROLL_INSENSITIVE</rowset-type> <show-deleted>false</show-deleted> <table-name>employees</table-name> <url><null/></url> <sync-provider> <sync-provider-name>com.sun.rowset.providers.RIOptimisticProvider </sync-provider-name> <sync-provider-vendor>Sun Microsystems Inc.</sync-provider-vendor> <sync-provider-version>1.0</sync-provider-version> <sync-provider-grade>2</sync-provider-grade> <data-source-lock>1</data-source-lock> </sync-provider> </properties> The metadata section contains metadata about the structure of the columns that our WebRowSet object consists of. For each rowset s column we have a <column-definition> element that describes the structure of the underlying column. The metadata section of a WebRowSet object is depicted here (extracted from emps.xml): <metadata> <column-count>3</column-count> <column-definition> <column-index>1</column-index> <auto-increment>false</auto-increment> <case-sensitive>false</case-sensitive> <currency>false</currency> <nullable>0</nullable> <signed>false</signed> <searchable>true</searchable> <column-display-size>10</column-display-size> <column-label>id</column-label> <column-name>id</column-name> <schema-name></schema-name> <column-precision>10</column-precision> <column-scale>0</column-scale> <table-name>employees</table-name> <catalog-name>octopus</catalog-name> <column-type>12</column-type> <column-type-name>VARCHAR</column-type-name> </column-definition> <column-definition> <column-index>2</column-index> <auto-increment>false</auto-increment> <case-sensitive>false</case-sensitive> <currency>false</currency> <nullable>1</nullable> <signed>false</signed>
CHAPTER 7 ROWSET METADATA
<searchable>true</searchable> <column-display-size>20</column-display-size> <column-label>name</column-label> <column-name>name</column-name> <schema-name></schema-name> <column-precision>20</column-precision> <column-scale>0</column-scale> <table-name>employees</table-name> <catalog-name>octopus</catalog-name> <column-type>12</column-type> <column-type-name>VARCHAR</column-type-name> </column-definition> <column-definition> <column-index>3</column-index> <auto-increment>false</auto-increment> <case-sensitive>false</case-sensitive> <currency>false</currency> <nullable>1</nullable> <signed>true</signed> <searchable>true</searchable> <column-display-size>11</column-display-size> <column-label>age</column-label> <column-name>age</column-name> <schema-name></schema-name> <column-precision>11</column-precision> <column-scale>0</column-scale> <table-name>employees</table-name> <catalog-name>octopus</catalog-name> <column-type>4</column-type> <column-type-name>INTEGER</column-type-name> </column-definition> </metadata> The data section of a WebRowSet object is depicted here (extracted from emps.xml): <data> <currentRow> <columnValue>88</columnValue> <columnValue>Peter Pan</columnValue> <columnValue><null/></columnValue> </currentRow> <currentRow> <columnValue>77</columnValue> <columnValue>Donald Duck</columnValue> <columnValue><null/></columnValue> </currentRow>
CHAPTER 7 ROWSET METADATA
<currentRow> <columnValue>33</columnValue> <columnValue>Mary Kent</columnValue> <columnValue>35</columnValue> </currentRow> <currentRow> <columnValue>44</columnValue> <columnValue>Monica Seles</columnValue> <columnValue>30</columnValue> </currentRow> </data>
The Solution
Here, I put all of the pieces together as a single program, which shows how to create a WebRowSet object and populate it from a database: import java.io.*; import java.sql.*; import javax.sql.*; import javax.sql.rowset.WebRowSet; import com.sun.rowset.WebRowSetImpl; import jcb.util.DatabaseUtil; import jcb.db.VeryBasicConnectionManager; public class DemoWebRowSet { WebRowSet webRS = null; public static void main(String[] args) { String dbVendor = args[0]; // {"mysql", "oracle", "odbc"} DemoWebRowSet demo = new DemoWebRowSet(); Connection conn = null; try { conn = VeryBasicConnectionManager.getConnection(dbVendor); demo.populateRowSet(conn); // note that WebRowSet is a "disconnected" object DatabaseUtil.close(conn); demo.writeXML(); } catch (Exception e) { e.printStackTrace(); } }
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