使用具名參數

直接看代碼：

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"><!-- 導入資源文件 --><context:property-placeholder location="classpath:db.properties"/><!-- 配置C3P0數據源 --><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,該對象可以使用具名參數，其沒有無參的構造器，所以必須為其構造器指定參數 --><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());}/*** 使用具名參數可以使用update(String sql, SqlParameterSource paramSource)方法進行更新* 1.SQL語句中的參數名和類的屬性名一樣。* 2.使用SqlParameterSource的BeanPropertySqlParameterSource實現類作為參數*/@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);}/*** 可以為參數起名字* 1.好處：若有多個參數，則不用再去對應位置，直接對應參數名，便于維護* 2.缺點：較為麻煩*/@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", "小樓");namedParameterJdbcTemplate.update(sql, paramMap);}/*** 獲取單個列的值,或者做統計查詢*/@Testpublic void testQueryForObject2(){String sql = "SELECT count(*) FROM student_info";long count = jdbcTemplate.queryForObject(sql, Long.class);System.out.println(count);}/*** 查到實體類的集合*/@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);}/*** 從數據庫中獲取一條記錄，實際得到對應的一個對象* 注意不是調用queryForObject(String sql,Class<Student> requiredType,Object... args)方法！* 而是調用queryForObject(String sql,RowMapper<Student> rowMapper,Object... args)方法！* 1.其中的RowMapper指定如何去映射結果集的行，常用的實現類為BeanPropertyRowMapper* 2.使用SQL中列的別名完成列名和類的屬性名的映射。例如class student_class* 3.不支持級聯框架，JdbcTemplate到底是一個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);}/*** 執行批量更新，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);}/*** 執行INSERT，UPDATE，DELETE*/@Testpublic void testUpdate(){String sql = "UPDATE student_info SET student_name = ? WHERE student_id = ?";jdbcTemplate.update(sql,"小黑","002");}}

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轉載于:https://www.cnblogs.com/LoganChen/p/6915215.html

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