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The connect tag opens a connection and manages a Statement and ResultSet object These aren t exposed as scripting variables; they re only accessible through other tags in this library The connection is closed when the end tag is encountered The syntax is <db:connect url= mydatabase > The driver class name could easily be added as another attribute I made it implicit here to simplify the JSP

<tag> <name>runQuery</name> <tagclass>jspcrtaglibjdbcRunQueryTag</tagclass> <bodycontent>JSP</bodycontent> <info>Reads and executes the SQL statement in the tag body</info> </tag>

The runQuery tag reads an SQL statement from its body and executes it using the Statement object created by the enclosing connect tag It can only be used in the body of a connect tag The syntax of the runQuery tag is <db:runQuery>sql statement</db:runQuery>

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<tag> <name>forEachRow</name> <tagclass>jspcrtaglibjdbcForEachRowTag</tagclass> <bodycontent>JSP</bodycontent> <info>Iterates over the current result set</info> </tag>

The forEachRow tag iterates over the current result set, so the getField tag can access its values This can only be used the body of a connect tag after a runQuery tag Its syntax is <db:forEachRow> </db:forEachRow>

<tag> <name>getField</name> <tagclass>jspcrtaglibjdbcGetFieldTag</tagclass> <bodycontent>empty</bodycontent> <info>Retrieves a field from the current result set row</info> <attribute> <name>name</name> <required>true</required> <rtexprvalue>true</rtexprvalue> </attribute> </tag>

The getField tag reads a field from the current result set row and returns its value as a String this can only appear in the body of a forEachRow tag Its syntax is <db:getField name= fieldName />

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which contains the People objects that belong to a role. The Role class has to define a public property that encapsulates the access code to the EntitySet(Of Person) private field. Here is the code snippet for it:

Four tag handlers need to be developed Because no scripting variables are defined, we don t need any TEI classes

The connect tag takes a database URL as an attribute, so the tag handler needs an instance variable and a setUrl() method:

package jspcrtaglibjdbc; import import import import javaxservletjsp*; javaxservletjsptagext*; javaio*; javasql*;

it is breaking the previous pattern of price action, and it also is very likely to create a short-term trendline break In her 1996 book Trading with the Odds, Cynthia Kase describes how she often uses this signal to exit trades Figure 9-8 shows examples of hammer dojis followed by change-of-direction candles in the summer of 2007 that marked a secondary low in GBPJPY

/** * ConnectTag */ public class ConnectTag extends TagSupport { public static final String DRIVER_CLASS = "sunjdbcodbcJdbcOdbcDriver"; // =========================================== // Tag attributes // =========================================== private String url; public void setUrl(String url) { thisurl = url; }

It defines the Connection, Statement, and ResultSet objects and provides public accessor methods for each, as well as a public runQuery() method:

// =========================================== // JDBC objects managed by this tag // =========================================== private Connection con; private Statement stmt; private ResultSet rs; public Connection getConnection() { return con; }

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public Statement getStatement() { return stmt; } public ResultSet getResultSet() { return rs; } /** * Runs a query * @param sql an SQL statement */ public void runQuery(String sql) throws SQLException { rs = stmtexecuteQuery(sql); }

The whole database operation is contained between the start and end tags, so the two lifecycle methods manage startup and shutdown:

// =========================================== // Lifecycle methods // =========================================== /** * Loads the driver class, opens a database * connection, and creates a Statement object */ public int doStartTag() throws JspException { con = null; try { ClassforName(DRIVER_CLASS); con = DriverManagergetConnection(url); stmt = concreateStatement(); } catch (Exception e) { throw new JspException(egetMessage()); } return EVAL_BODY_INCLUDE; } /** * Closes the connection and other JDBC objects */ public int doEndTag() throws JspException

{ try { if (rs != null) { rsclose(); rs = null; } if (stmt != null) { stmtclose(); stmt = null; } if (con != null) { conclose(); con = null; } } catch (SQLException e) { throw new JspException(egetMessage()); } return EVAL_PAGE; } }

The runQuery tag does three things: I Extracts an SQL statement from its body I Finds the enclosing connect tag I Executes the connectrunQuery() method The source code is listed here:

package jspcrtaglibjdbc; import import import import import javaxservletjsp*; javaxservletjsptagext*; javaio*; javasql*; javautil*;

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