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    <Resource name="jdbc/bookstore" auth="Container" type="javax.sql.DataSource"
              maxActive="100" maxIdle="30" maxWait="10000"
              username="root" password="123456"
              driverClassName="com.mysql.jdbc.Driver"
              url="jdbc:mysql://localhost:3306/bookstore?autoReconnect=true"/>
</Context>
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Context ctx = new InitialContext();
DataSource ds = (DataSource)ctx.lookup("java:comp/env/jdbc/bookstore");
Connection conn = ds.getConnection();
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