使用具名参数
直接看代码：
db.properties
jdbc.user=root
jdbc.password=logan123
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.jdbcUrl=jdbc:mysql://localhost:3306/selective-courses-systemjdbc.initPoolSize=5
jdbc.maxPoolSize=10 applicationContext.xml
<?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:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd"><!-- 导入资源文件 --><context:property-placeholder location="classpath:db.properties"/><!-- 配置C3P0数据源 --><bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"><property name="user" value="${jdbc.user}"></property><property name="password" value="${jdbc.password}"></property><property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property><property name="driverClass" value="${jdbc.driverClass}"></property><property name="initialPoolSize" value="${jdbc.initPoolSize}"></property><property name="maxPoolSize" value="${jdbc.maxPoolSize}"></property></bean><!-- 配置Spring的JDBCTemplate --><bean id="jdbcTemplate"class="org.springframework.jdbc.core.JdbcTemplate"><property name="dataSource" ref="dataSource"></property></bean><!-- 配置NamedParameterJdbcTemplate,该对象可以使用具名参数，其没有无参的构造器，所以必须为其构造器指定参数 --><bean id="namedParameterJdbcTemplate"class="org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate"><constructor-arg ref="dataSource"></constructor-arg></bean> </beans>
package logan.study.spring.jdbc;public class Student {String student_id;String student_name;String card_id;String student_class;String sex;String password;String perovince;String address;String tel;String interests;public String getStudent_id() {return student_id;}public void setStudent_id(String student_id) {this.student_id = student_id;}public String getStudent_name() {return student_name;}public void setStudent_name(String student_name) {this.student_name = student_name;}public String getCard_id() {return card_id;}public void setCard_id(String card_id) {this.card_id = card_id;}public String getStudent_class() {return student_class;}public void setStudent_class(String student_class) {this.student_class = student_class;}public String getSex() {return sex;}public void setSex(String sex) {this.sex = sex;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public String getPerovince() {return perovince;}public void setPerovince(String perovince) {this.perovince = perovince;}public String getAddress() {return address;}public void setAddress(String address) {this.address = address;}public String getTel() {return tel;}public void setTel(String tel) {this.tel = tel;}public String getInterests() {return interests;}public void setInterests(String interests) {this.interests = interests;}@Overridepublic String toString() {return "Student [student_id=" + student_id + ", student_name=" + student_name + ", card_id=" + card_id+ ", student_class=" + student_class + ", sex=" + sex + ", password=" + password + ", perovince="+ perovince + ", address=" + address + ", tel=" + tel + ", interests=" + interests + "]";}}
package logan.study.spring.jdbc;import static org.junit.Assert.*;import java.sql.SQLException; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map;import javax.sql.DataSource;import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import org.springframework.jdbc.core.BeanPropertyRowMapper; import org.springframework.jdbc.core.JdbcTemplate; import org.springframework.jdbc.core.RowMapper; import org.springframework.jdbc.core.namedparam.BeanPropertySqlParameterSource; import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate; import org.springframework.jdbc.core.namedparam.SqlParameterSource;public class JDBCTest {private ApplicationContext ctx = null;private JdbcTemplate jdbcTemplate;private NamedParameterJdbcTemplate namedParameterJdbcTemplate;{ctx = new ClassPathXmlApplicationContext("applicationContext.xml");jdbcTemplate = (JdbcTemplate) ctx.getBean("jdbcTemplate");namedParameterJdbcTemplate = ctx.getBean(NamedParameterJdbcTemplate.class);}@Testpublic void testDataSource() throws SQLException {DataSource dataSource = (DataSource) ctx.getBean("dataSource");System.out.println(dataSource.getConnection());}/*** 使用具名参数可以使用update(String sql, SqlParameterSource paramSource)方法进行更新* 1.SQL语句中的参数名和类的属性名一样。* 2.使用SqlParameterSource的BeanPropertySqlParameterSource实现类作为参数*/@Testpublic void testNamedParameterJdbcTemplate2(){String sql = "INSERT INTO student_info (student_id,student_name) VALUES(:student_id,:student_name)";Student student = new Student();student.setStudent_id("100");student.setStudent_name("小周");SqlParameterSource paramSource = new BeanPropertySqlParameterSource(student);namedParameterJdbcTemplate.update(sql, paramSource);}/*** 可以为参数起名字* 1.好处：若有多个参数，则不用再去对应位置，直接对应参数名，便于维护* 2.缺点：较为麻烦*/@Testpublic void testNamedParameterJdbcTemplate(){String sql = "INSERT INTO student_info (student_id,student_name) VALUES(:si,:sn)";Map<String,Object> paramMap = new HashMap<>();paramMap.put("si", "HH");paramMap.put("sn", "小楼");namedParameterJdbcTemplate.update(sql, paramMap);}/*** 获取单个列的值,或者做统计查询*/@Testpublic void testQueryForObject2(){String sql = "SELECT count(*) FROM student_info";long count = jdbcTemplate.queryForObject(sql, Long.class);System.out.println(count);}/*** 查到实体类的集合*/@Testpublic void testQueryForList(){String sql = "SELECT student_id,student_name,card_id,class student_class,sex,password,perovince,tel,interests from student_info where student_id > ?";RowMapper<Student> rowMapper = new BeanPropertyRowMapper<>(Student.class);List<Student> students = jdbcTemplate.query(sql, rowMapper,5);System.out.println(students);}/*** 从数据库中获取一条记录，实际得到对应的一个对象* 注意不是调用queryForObject(String sql,Class<Student> requiredType,Object... args)方法！* 而是调用queryForObject(String sql,RowMapper<Student> rowMapper,Object... args)方法！* 1.其中的RowMapper指定如何去映射结果集的行，常用的实现类为BeanPropertyRowMapper* 2.使用SQL中列的别名完成列名和类的属性名的映射。例如class student_class* 3.不支持级联框架，JdbcTemplate到底是一个JDBC的小工具，而不是ORM框架。*/@Testpublic void testQueryForObject(){String sql = "SELECT student_id,student_name,card_id,class student_class,sex,password,perovince,tel,interests from student_info where student_id=?";RowMapper<Student> rowMapper = new BeanPropertyRowMapper<>(Student.class);Student student = jdbcTemplate.queryForObject(sql, rowMapper,1);System.out.println(student);}/*** 执行批量更新，批量INSERT，UPDATE，DELETE* */@Testpublic void testBatchUpdate(){String sql = "INSERT INTO student_info (student_id,student_name) VALUES(?,?)";List<Object[]> pss = new ArrayList<Object[]>();pss.add(new Object[]{"009","AA"});pss.add(new Object[]{"010","BB"});pss.add(new Object[]{"011","CC"});pss.add(new Object[]{"012","DD"});pss.add(new Object[]{"013","EE"});pss.add(new Object[]{"014","FF"});pss.add(new Object[]{"015","GG"});jdbcTemplate.batchUpdate(sql, pss);}/*** 执行INSERT，UPDATE，DELETE*/@Testpublic void testUpdate(){String sql = "UPDATE student_info SET student_name = ? WHERE student_id = ?";jdbcTemplate.update(sql,"小黑","002");}}
 安装及版本库介绍)
 逻辑卷(LV))
