一、 配置数据源:
嵌入式数据库的支持:Spring Boot 可以自动配置 H2, HSQL and Derby 数据库，不需要提供任何的 链接 URLs，只需要加入相应的 jar 包，Spring boot 可以自动发现装配
<!-- 数据库 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
mysql
spring.datasource.url=jdbc:mysql://localhost/spring_boot_demo?useUnicode=true&character
Encoding=utf-8
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
注:
1.可以不指定 driver-class-name，spring boot 会自动识别 url。
2.数据连接池默认使用 tomcat-jdbc
连接池的配置: spring.datasource.tomcat.*
二、JdbcTemplate 模板
// 自动注册
@Autowired
private JdbcTemplate jdbcTemplate;
三、 脚本
CREATE TABLE `roncoo_user` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) DEFAULT NULL,
`create_time` datetime DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8 COMMENT='用户表';
Spring Boot 基础教程 作者:冯永伟
四、实体类
/**
* 实体类
*
* @author wujing */
public class RoncooUser {
private int id;
private String name;
private Date createTime;
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 Date getCreateTime() {
return createTime;
}
public void setCreateTime(Date createTime) {
this.createTime = createTime;
}
@Override
public String toString() {
return "RoncooUser [id=" + id + ", name=" + name + ", createTime=" + createTime }
}
五、 接口
int insert(RoncooUser roncooUser);
int deleteById(int id);
int updateById(RoncooUser roncooUser);
RoncooUser selectById(int id);
六、实现类代码
@Repository
public class RoncooUserDaoImpl implements RoncooUserDao {
@Autowired
private JdbcTemplate jdbcTemplate;
@Override
public int insert(RoncooUser roncooUser) {
String sql = "insert into roncoo_user (name, create_time) values (?, ?)";
return jdbcTemplate.update(sql, roncooUser.getName(), roncooUser.getCreateTime());
}
@Override
public int deleteById(int id) {
String sql = "delete from roncoo_user where id=?";
return jdbcTemplate.update(sql, id);
}
@Override
public int updateById(RoncooUser roncooUser) {
String sql = "update roncoo_user set name=?, create_time=? where id=?";
return jdbcTemplate.update(sql, roncooUser.getName(), roncooUser.getCreateTime(), roncooUser.getId());
}
@Override
public RoncooUser selectById(int id) {
String sql = "select * from roncoo_user where id=?";
return jdbcTemplate.queryForObject(sql, new RowMapper<RoncooUser>() {
@Override
public RoncooUser mapRow(ResultSet rs, int rowNum) throws SQLException {
RoncooUser roncooUser = new RoncooUser();
roncooUser.setId(rs.getInt("id"));
roncooUser.setName(rs.getString("name"));
roncooUser.setCreateTime(rs.getDate("create_time"));
return roncooUser;
}
};
}
}
七、测试类代码
@Repository
public class RoncooUserDaoImpl implements RoncooUserDao {
@Autowired
private JdbcTemplate jdbcTemplate;
@Override
public int insert(RoncooUser roncooUser) {
String sql = "insert into roncoo_user (name, create_time) values (?, ?)";
return jdbcTemplate.update(sql, roncooUser.getName(), roncooUser.getCreateTime());
}
@Override
public int deleteById(int id) {
String sql = "delete from roncoo_user where id=?";
return jdbcTemplate.update(sql, id);
}
@Override
public int updateById(RoncooUser roncooUser) {
String sql = "update roncoo_user set name=?, create_time=? where id=?";
return jdbcTemplate.update(sql, roncooUser.getName(), roncooUser.getCreateTime(), roncooUser.getId());
}
@Override
public RoncooUser selectById(int id) {
String sql = "select * from roncoo_user where id=?";
return jdbcTemplate.queryForObject(sql, new RowMapper<RoncooUser>() {
@Override
public RoncooUser mapRow(ResultSet rs, int rowNum) throws SQLException {
RoncooUser roncooUser = new RoncooUser();
roncooUser.setId(rs.getInt("id"));
roncooUser.setName(rs.getString("name"));
roncooUser.setCreateTime(rs.getDate("create_time"));
return roncooUser;
}
}, id);
}
}
打印 sql 语句，添加如下,logback-roncoo.xml
<logger name="org.springframework.jdbc.core.JdbcTemplate" level="debug"/>
八、封装 spring jdbc，带分页
**
* 获取当前事务最后一次更新的主键值 */
public Long getLastId() {
return jdbcTemplate.queryForObject("select last_insert_id() as id", Long.class);
}
/**
* 获取对象信息 */
public <T> T queryForObject(String sql, Class<T> clazz, Object... args) { Assert.hasText(sql, "sql 语句不能为空");
return jdbcTemplate.queryForObject(sql, new BeanPropertyRowMapper<T>(clazz), args);
}
/**
* 获取对象集合信息 */
public <T> List<T> queryForObjectList(String sql, Class<T> clazz, Object... args) { Assert.hasText(sql, "sql 语句不能为空");
return jdbcTemplate.query(sql, args, new BeanPropertyRowMapper<T>(clazz));
}
/**
* 分页，jdbcTemplate 不支持 like 自定义，只能拼装 */
public Page<Map<String, Object>> queryForPage(String sql, int pageCurrent, int
pageSize, Object... args) {
Assert.hasText(sql, "sql 语句不能为空");
Assert.isTrue(pageCurrent >= 1, "pageNo 必须大于等于 1");
String sqlCount = Sql.countSql(sql);
int count = jdbcTemplate.queryForObject(sqlCount, Integer.class, args); pageCurrent = Sql.checkPageCurrent(count, pageSize, pageCurrent);
pageSize = Sql.checkPageSize(pageSize);
int totalPage = Sql.countTotalPage(count, pageSize);
String sqlList = sql + Sql.limitSql(count, pageCurrent, pageSize); List<Map<String, Object>> list = jdbcTemplate.queryForList(sqlList, args); return new Page<Map<String, Object>>(count, totalPage, pageCurrent, pageSize,
list); }
/**
-
分页，jdbcTemplate 不支持 like 是定义，只能拼装 */
public <T> Page<T> queryForPage(String sql, int pageCurrent, int pageSize, Class<T> clazz, Object... args) { Assert.hasText(sql, "sql 语句不能为空"); Assert.isTrue(pageCurrent >= 1, "pageNo 必须大于等于 1"); Assert.isTrue(clazz != null, "clazz 不能为空"); String sqlCount = Sql.countSql(sql); int count = jdbcTemplate.queryForObject(sqlCount, Integer.class, args); pageCurrent = Sql.checkPageCurrent(count, pageSize, pageCurrent); pageSize = Sql.checkPageSize(pageSize); int totalPage = Sql.countTotalPage(count, pageSize); String sqlList = sql + Sql.limitSql(count, pageCurrent, pageSize); List<T> list = jdbcTemplate.query(sqlList, new BeanPropertyRowMapper<T>(clazz), return new Page<T>(count, totalPage, pageCurrent, pageSize, list); @Test public void select2() { RoncooUser result = roncooUserDao.selectById(7); System.out.println(result); } // 分页测试 @Test public void queryForPage(){ Page<RoncooUser> result = roncooUserDao.queryForPage(1,20, "测试"); System.out.println(result.getList()); } 实现类 @Override public Page<RoncooUser> queryForPage(int pageCurrent, int pageSize, String name){ // 确定参数 /*String sql = "select * from roncoo_user where name=?"; return queryForPage(sql.toString(), pageCurrent, pageSize, RoncooUser.class, name);*/ // 若name可能为空，则要进行判定，如下 /*StringBuffer sql = new StringBuffer("select * from roncoo_user where 1"); args); }测试
if(!StringUtils.isNullOrEmpty(name)){ // Sql.checkSql 的作用是防止sql注入 sql.append(" and name = '").append(Sql.checkSql(name)).append("' "); } return queryForPage(sql.toString(), pageCurrent, pageSize, RoncooUser.class);*/ // 若要like查询，如下 StringBuffer sql = new StringBuffer("select * from roncoo_user where 1"); if(!StringUtils.isNullOrEmpty(name)){ // Sql.checkSql 的作用是防止sql注入 sql.append(" and name like '%").append(Sql.checkSql(name)).append("%' "); } return queryForPage(sql.toString(), pageCurrent, pageSize, RoncooUser.class); }}