在maven中实现spring的jdbc模块

本项目是在maven中构建的，所以要在pom.xml中加入dependency：

<dependencies> <!--编译加载java连接数据库的依赖jar包，mysql-connector-java--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.0.5</version> </dependency> <!--spring相关包--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>4.3.1.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>4.3.1.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>4.3.6.RELEASE</version> </dependency> <!-- https://mvnrepository.com/artifact/c3p0/c3p0 --> <dependency> <groupId>c3p0</groupId> <artifactId>c3p0</artifactId> <version>0.9.1.2</version> </dependency> <!-- https://mvnrepository.com/artifact/commons-dbcp/commons-dbcp --> <dependency> <groupId>commons-dbcp</groupId> <artifactId>commons-dbcp</artifactId> <version>1.4</version> </dependency> </dependencies>

（1）数据库中有的字段名字，写进java文件中：

import java.io.Serializable; /** * 数据库中的数据字段 */ public class Emp implements Serializable{ private int id; private String name; private String sex; private String age; private String tel; public Emp(){ super(); } public Emp(int id,String name,String sex,String age,String tel){ super(); this.id=id; this.name=name; this.sex=sex; this.age=age; this.tel=tel; } public int getId(){ return id; } public void setId(int id){ this.id=id; } public String getName(){ return name; } public void setName(String name){ this.name=name; } public String getSex(){ return sex; } public void setSex(String sex){ this.sex=sex; } public String getAge(){ return age; } public void setAge(String age){ this.age=age; } public String getTel(){ return tel; } public void setTel(String tel){ this.tel=tel; } }

（2）定义接口（增删改查）：

public interface EmpDao { /*插入的操作*/ boolean insert(Emp entity); /*查询所有*/ List<Emp> findAll(); }

（3）实现上面接口的类（增删改查）：

import org.springframework.jdbc.core.JdbcTemplate; import org.springframework.jdbc.core.RowMapper; import java.sql.ResultSet; import java.sql.SQLException; import java.util.ArrayList; import java.util.List; /** * 实现EmpDao接口的类 */ public class EmpDaoImpl implements EmpDao { private JdbcTemplate jdbcTemplate; public EmpDaoImpl(JdbcTemplate jdbcTemplate){ this.jdbcTemplate=jdbcTemplate; } @SuppressWarnings("unchecked") public List<Emp> findAll() { // 定义返回结果 List<Emp> entities =new ArrayList<Emp>(); entities = (List<Emp>) jdbcTemplate.query( "select id,name,sex from students", new RowMapper() { public Object mapRow(ResultSet rs, int rowNum) throws SQLException { Emp emp = new Emp(); emp.setId(rs.getInt("id")); emp.setName(rs.getString("name")); emp.setSex(rs.getString("sex")); return emp; } }); return entities; } //插入数据 public boolean insert(Emp entity) { // 定义返回结果 boolean flag = false; /* 插入实现 */ int i = jdbcTemplate.update( "insert into students(id,name,sex,age,tel) values(?,?,?,?,?)", new Object[] { entity.getId(), entity.getName(),entity.getSex(), entity.getAge(),entity.getTel()}); if (i > 0) { flag = true; } return flag; } }

（4）配置类：要进行数据库连接，数据的注入，把jdbcTemplate注入到EmpDaoImpl 中：

import org.apache.commons.dbcp.BasicDataSource; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.jdbc.core.JdbcTemplate; import javax.sql.DataSource; /** * Created by Administrator on 2017/3/8. */ @Configuration public class EmDaoConfig { @Bean public BasicDataSource dataSource(){ BasicDataSource ds=new BasicDataSource(); ds.setDriverClassName("com.mysql.jdbc.Driver");//加载驱动 ds.setUrl("jdbc:mysql://localhost:3306/mydata?"); ds.setUsername("root"); ds.setPassword("86914381"); ds.setInitialSize(5); //池启动时创建的连接数量 ds.setMaxActive(10); //同一时间可以从池中分配的最多连接数。如果设置为0，则无限制 return ds; } @Bean //加入数据 public JdbcTemplate jdbcTemplate(DataSource dataSource){ return new JdbcTemplate(dataSource); } @Bean //jdbcTemplate注入依赖 public EmpDao empDaoImpl(JdbcTemplate jdbcTemplate){ return new EmpDaoImpl(jdbcTemplate); } }

（5）测试类：

import org.springframework.context.ApplicationContext; import org.springframework.context.annotation.AnnotationConfigApplicationContext; import java.util.List; /** * 测试实例 */ public class EmDaoTest { public static void main(String[] args){ ApplicationContext ac=new AnnotationConfigApplicationContext(EmDaoConfig.class); //获取实例 EmpDao ed = ac.getBean(EmpDao.class); List<Emp> emps = ed.findAll(); for(Emp emp:emps){ System.out.println( "ID::"+emp.getId()+" Name::"+emp.getName()+" sex::"+emp.getSex()); } //插入数据 Emp emp=new Emp(20,"llqllq","男","10","15603004804"); boolean flag=ed.insert(emp); if(flag){ System.out.println("插入成功"); }else{ System.out.println("插入失败"); } } }