Professional Java Development with the Spring Framework学习笔记(1) - JdbcTemplate 中Query的几种用法
2005-10-09 09:39
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数据库准备：
CREATE TABLE mytable(
id INTEGER NOT NULL,
name VARCHAR(50),
PRIMARY KEY(id));
代码：GenreQuery.java
package com.spring.test1;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.sql.DataSource;
import org.springframework.jdbc.object.MappingSqlQuery;
public class GenreQuery extends MappingSqlQuery {private static String SQL_GENRE_QUERY = "select id,name from mytable Order By id";
public GenreQuery(DataSource ds) {super(ds, SQL_GENRE_QUERY);
//如果有参数，在这里设置
//declareParameter(new SqlParameter("id", Types.INTEGER));compile();
}
public Object mapRow(ResultSet rs, int rowNumber) throws SQLException {Genre bean = new Genre();
bean.setId(rs.getLong("id")); bean.setName(rs.getString("name"));return bean;
}
}
代码：Genre.java
package com.spring.test1;
/**
* Represents a genere of shows.
*/
public class Genre {// the id of this genere
private long id;
// the name of this genre
private String name;
/**
* Empty contructor for this genere (to support javabean spec.)
*/
public Genre() {}
/**
* Constructs a new genre with a given name.
* @param name The name of this genre.
*/
public Genre(String name) {this.name = name;
}
/**
* Returns the id of this genre.
* @return The id of this genre.
*/
public long getId() {return id;
}
/**
* Sets the id of this genre.
* @param id The id of this genre.
*/
public void setId(long id) {this.id = id;
}
/**
* Returns 4000 the name of this genre.
* @return The name of this genre.
*/
public String getName() {return name;
}
/**
* Sets the name of this genre.
* @param name The name of this genre.
*/
public void setName(String name) {this.name = name;
}
}
代码：JdbcQueryTest.java
package com.spring.test1;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import junit.framework.TestCase;
import org.springframework.dao.DataAccessException;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.ResultSetExtractor;
import org.springframework.jdbc.core.RowCallbackHandler;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
public class JdbcQueryTest extends TestCase {private DriverManagerDataSource dataSource;
public void setUp() {dataSource = new DriverManagerDataSource();
dataSource.setDriverClassName("oracle.jdbc.OracleDriver"); dataSource.setUrl("jdbc:oracle:thin:@gsgaofei:1521:fangj"); dataSource.setUsername("test2"); dataSource.setPassword("test2");JdbcTemplate jt = new JdbcTemplate(dataSource);
jt.execute("delete from mytable"); jt.execute("insert into mytable (id, name) values(1, 'Rock')"); jt.execute("insert into mytable (id, name) values(2, 'Ballet')"); jt.execute("insert into mytable (id, name) values(3, 'Theatre')"); jt.execute("insert into mytable (id, name) values(4, 'Classical')"); jt.execute("insert into mytable (id, name) values(5, 'Musical')"); jt.execute("insert into mytable (id, name) values(6, 'Opera')");}
/**
* 方法1
*/
public List getAllGenre1() {StringBuffer sqlBuffer = null;
final List list = new ArrayList();
sqlBuffer = new StringBuffer();
sqlBuffer.append("SELECT * FROM mytable ORDER BY ID");JdbcTemplate jt = new JdbcTemplate(dataSource);
jt.query(sqlBuffer.toString(), new RowCallbackHandler() { public void processRow(ResultSet rs) throws SQLException {Genre bean = new Genre();
bean.setId(rs.getLong("ID")); bean.setName(rs.getString("NAME"));list.add(bean);
}
});
return list;
}
public void testGetAllGenre1() { System.out.println("------- getAllGenre1 result --------");List list = getAllGenre1();
for (Iterator it = list.iterator(); it.hasNext();) {Genre bean = (Genre) it.next();
System.out.println("ID : " + bean.getId()); System.out.println("NAME : " + bean.getName());}
}
/**
* 方法2
*/
public List getAllGenre2() {StringBuffer sqlBuffer = null;
final List list = new ArrayList();
sqlBuffer = new StringBuffer();
sqlBuffer.append("SELECT * FROM mytable ORDER BY ID");JdbcTemplate jt = new JdbcTemplate(dataSource);
Object obj = jt.query(sqlBuffer.toString(), new ResultSetExtractor() {public Object extractData(ResultSet rs) throws SQLException,
DataAccessException { while (rs.next()) {Genre bean = new Genre();
bean.setId(rs.getLong("ID")); bean.setName(rs.getString("NAME"));list.add(bean);
}
return list;
}
});
return (List) obj;
}
public void testGetAllGenre2() { System.out.println("------- getAllGenre2 result --------");List list = getAllGenre2();
for (Iterator it = list.iterator(); it.hasNext();) {Genre bean = (Genre) it.next();
System.out.println("ID : " + bean.getId()); System.out.println("NAME : " + bean.getName());}
}
/**
* 方法3
*/
public void testGetAllGenre3() { System.out.println("------- getAllGenre3 result --------");GenreQuery genreQuery = new GenreQuery(dataSource);
List list = genreQuery.execute();//这里如果有参数，可以参考API文档设置
for (Iterator it = list.iterator(); it.hasNext();) {Genre bean = (Genre) it.next();
System.out.println("ID : " + bean.getId()); System.out.println("NAME : " + bean.getName());}
}
}
测试结果如下：
[align=left]2005-10-09 09:21:31,316 INFO [org.springframework.jdbc.datasource.DriverManagerDataSource] - Loaded JDBC driver: oracle.jdbc.OracleDriver[/align][align=left]------- getAllGenre1 result --------[/align][align=left]ID : 1[/align][align=left]NAME : Rock[/align][align=left]ID : 2[/align][align=left]NAME : Ballet[/align][align=left]ID : 3[/align][align=left]NAME : Theatre[/align][align=left]ID : 4[/align][align=left]NAME : Classical[/align][align=left]ID : 5[/align][align=left]NAME : Musical[/align][align=left]ID : 6[/align][align=left]NAME : Opera[/align][align=left]2005-10-09 09:21:32,753 INFO [org.springframework.jdbc.datasource.DriverManagerDataSource] - Loaded JDBC driver: oracle.jdbc.OracleDriver[/align][align=left]------- getAllGenre2 result --------[/align][align=left]ID : 1[/align][align=left]NAME : Rock[/align][align=left]ID : 2[/align][align=left]NAME : Ballet[/align][align=left]ID : 3[/align][align=left]NAME : Theatre[/align][align=left]ID : 4[/align][align=left]NAME : Classical[/align][align=left]ID : 5[/align][align=left]NAME : Musical[/align][align=left]ID : 6[/align][align=left]NAME : Opera[/align][align=left]2005-10-09 09:21:33,206 INFO [org.springframework.jdbc.datasource.DriverManagerDataSource] - Loaded JDBC driver: oracle.jdbc.OracleDriver[/align][align=left]------- getAllGenre3 result --------[/align][align=left]ID : 1[/align][align=left]NAME : Rock[/align][align=left]ID : 2[/align][align=left]NAME : Ballet[/align][align=left]ID : 3[/align][align=left]NAME : Theatre[/align][align=left]ID : 4[/align][align=left]NAME : Classical[/align][align=left]ID : 5[/align][align=left]NAME : Musical[/align][align=left]ID : 6[/align][align=left]NAME : Opera[/align]
说明：上述例子使用了三种query方法，因为这里为了方便测试所以在方法里使用了
JdbcTemplate jt = new JdbcTemplate(dataSource); 而在实际应用中我们
可以把JdbcQueryTest extends JdbcDaoSupport，这样例子里的jt可以替换为
getJdbcTemplate()。
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