spring-boot-JdbcTemplate
添加依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
自定义数据源
spring-boot-starter-jdbc 默认使用tomcat-jdbc数据源
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.0.19</version>
</dependency>
数据源配置
spring.datasource.url = jdbc:mysql://localhost:3306/spring?useUnicode=true&characterEncoding=utf-8
spring.datasource.username = root
spring.datasource.password = root
spring.datasource.driver-class-name = com.mysql.jdbc.Driver
配置自己的数据源
@Autowired
private Environment env;
//destroy-method="close"的作用是当数据库连接不使用的时候,就把该连接重新放到数据池中,方便下次使用调用.
@Bean(destroyMethod = "close")
public DataSource dataSource() {
DruidDataSource dataSource = new DruidDataSource();
dataSource.setUrl(env.getProperty("spring.datasource.url"));
//用户名
dataSource.setUsername(env.getProperty("spring.datasource.username"));
//密码
dataSource.setPassword(env.getProperty("spring.datasource.password"));
dataSource.setDriverClassName(env.getProperty("spring.datasource.driver-class-name"));
//初始化时建立物理连接的个数。初始化发生在显示调用init方法,或者第一次getConnection时
dataSource.setInitialSize(2);
//最大连接池数量
dataSource.setMaxActive(20);
//最小连接池数量
dataSource.setMinIdle(0);
//获取连接时最大等待时间,单位毫秒。配置了maxWait之后,缺省启用公平锁,并发效率会有所下降,
//如果需要可以通过配置 useUnfairLock属性为true使用非公平锁。
dataSource.setMaxWait(60000);
//用来检测连接是否有效的sql,要求是一个查询语句,常用select 'x'。
//如果validationQuery为null,testOnBorrow、testOnReturn、testWhileIdle都不会其作用。
dataSource.setValidationQuery("SELECT 1");
//申请连接时执行 validationQuery检测连接是否有效,做了这个配置会降低性能。
dataSource.setTestOnBorrow(false);
//建议配置为true,不影响性能,并且保证安全性。申请连接的时候检测,
// 如果空闲时间大于timeBetweenEvictionRunsMillis,执行validationQuery检测连接是否有效。
dataSource.setTestWhileIdle(true);
//是否缓存preparedStatement,也就是PSCache。PSCache对支持游标的数据库性能提升巨大,
// 比如说oracle。在mysql下建议关闭。
dataSource.setPoolPreparedStatements(false);
return dataSource;
}
定义实体对象
public class LearnResouce {
private Long id;
private String author;
private String title;
private String url;
// SET和GET方法
}
定义dao接口
public interface LearnDao {
int add(LearnResouce learnResouce);
int update(LearnResouce learnResouce);
int deleteByIds(String ids);
LearnResouce queryLearnResouceById(Long id);
Page queryLearnResouceList(Map<String,Object> params);
}
定义 dao 实现
@Repository
public class LearnDaoImpl implements LearnDao {
@Autowired
private JdbcTemplate jdbcTemplate;
@Override
public int add(LearnResouce learnResouce) {
return jdbcTemplate.update("insert into learn_resource(author, title,url) values(?, ?, ?)",
learnResouce.getAuthor(), learnResouce.getTitle(), learnResouce.getUrl());
}
@Override
public int update(LearnResouce learnResouce) {
return jdbcTemplate.update("update learn_resource set author=?,title=?,url=? where id = ?",
new Object[]{learnResouce.getAuthor(), learnResouce.getTitle(), learnResouce.getUrl(),
learnResouce.getId()});
}
@Override
public int deleteByIds(String ids) {
return jdbcTemplate.update("delete from learn_resource where id in(" + ids + ")");
}
@Override
public LearnResouce queryLearnResouceById(Long id) {
List<LearnResouce> list = jdbcTemplate.query("select * from learn_resource where id = ?",
new Object[]{id}, new BeanPropertyRowMapper(LearnResouce.class));
if (null != list && list.size() > 0) {
LearnResouce learnResouce = list.get(0);
return learnResouce;
} else {
return null;
}
}
@Override
public Page queryLearnResouceList(Map<String, Object> params) {
StringBuffer sql = new StringBuffer();
sql.append("select * from learn_resource where 1=1");
if (!StringUtil.isNull((String) params.get("author"))) {
sql.append(" and author like '%").append((String) params.get("author")).append("%'");
}
if (!StringUtil.isNull((String) params.get("title"))) {
sql.append(" and title like '%").append((String) params.get("title")).append("%'");
}
Page page = new Page(sql.toString(), Integer.parseInt(params.get("page").toString()),
Integer.parseInt(params.get("rows").toString()), jdbcTemplate);
return page;
}
}
参考:
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