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CHAPTER 6 PERSISTENCE WITH JDBC
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Introducing New Spring 2.0 Features
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The release of Spring 2.0 introduced several improvements to Spring in general and two improvements specific to persistence. Both features are extras provided by Spring for convenience. Of course, you are not required to use them.
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Using the SimpleJdbcTemplate Class
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Version 2.0 of the Spring Framework introduced a new version of the JdbcTemplate: org.springframework.jdbc.core.simple.SimpleJdbcTemplate. This wrapper class for the original template uses Java 5 (and newer) facilities such as varargs and autoboxing. This simplifies the use of the template for performing database operations through the JDBC API. It also exposes only the most commonly used methods of the normal JdbcTemplate class, as shown in Table 6-5, and offers a more convenient method signature. Table 6-5. Methods Provided by SimpleJdbcTemplate
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query() queryForInt() queryForLong() queryForMap() queryForList() queryForObject()
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Allows you to query by specifying a SQL statement, a parameterized row mapper, and optionally any parameters Allows you to query for an int by specifying a SQL statement and optionally any parameters Allows you to query for a long by specifying a SQL statement and optionally any parameters Allows you to query for a Map by specifying a SQL statement and optionally any parameters Allows you to query for a List by specifying a SQL statement and optionally any parameters Allows you to query for a specific object by specifying a SQL statement, either the class of the object to convert to or a parameterized row mapper, and optionally any parameters Allows you to execute an update statement by specifying the update statement and optionally any parameters
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update()
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All methods of SimpleJdbcTemplate allow you to specify the optional parameters as commaseparated arguments, instead of needing to create an object array to pass in the arguments. Furthermore, the SimpleJdbcTemplate class uses a strongly typed org.springframework.jdbc. core.simple.ParameterizedRowMapper interface instead of the normal RowMapper interface, which is created for a specific type of object, so you do not need to cast the result of the query. Using SimpleJdbcTemplate, we can rewrite the implementation of the load() method (Listing 6-11) as shown in Listing 6-24. Listing 6-24. Rewritten load() Method Implementation Using the SimpleJdbcTemplate Class public Member load(Integer id) { return new SimpleJdbcTemplate(getDataSource()).queryForObject( "SELECT * FROM member WHERE id = ", new ParameterizedRowMapper<Member>() { public Member mapRow(ResultSet resultSet, int row) throws SQLException { Member member = new Member();
CHAPTER 6 PERSISTENCE WITH JDBC
member.setId(resultSet.getInteger("id")); member.getName().setFirst(resultSet.getString("name_first")); member.getName().setLast(resultSet.getString("name_last")); member.setAge(resultSet.getInteger("age")); return member; } }, id); } Note that we do not need to cast the object resulting from the query to the specific implementation class, and we do not need to create an object array to pass in the ID. Even when multiple arguments must be provided, we can just add them as extra arguments. Let s assume we have a more complex query to obtain the total number of members that exist for a certain age range and have a certain first name. We can implement this as shown in Listing 6-25. Listing 6-25. Using the Convenient Syntax Provided by the SimpleJdbcTemplate Class public int getTotalNumberOfMembers(Integer startAge, Integer endAge, String firstName) { return new SimpleJdbcTemplate(getDataSource()).queryForInt( "SELECT COUNT(0) FROM member " + "WHERE age > AND age < AND first_name = ", startAge, endAge, firstName); } From this example, it is more obvious why using the new syntax is a more convenient way to perform database operations.
Caution
The SimpleJdbcTemplate class uses Java 5 (and newer) syntax, so you can use it only when you are actually running in a Java 5 (or newer) environment.
Performing JNDI Data Source Lookups
As explained in the previous chapter, you can look up a data source through JNDI. The namespace support offered by Spring 2.0 discussed earlier allows for an easier configuration, as shown in Listing 6-26. Listing 6-26. Spring 2.0 Syntax for Looking Up a Data Source Through JNDI < xml version="1.0" encoding="UTF-8" > <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:jndi="http://www.springframework.org/schema/jndi" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/jndi http://www.springframework.org/schema/jndi/spring-jndi.xsd"> <jndi:lookup id="dataSource" jndiName="jdbc/MyDataSource"/> </beans>
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