一、 配置數據源：
嵌入式數據庫的支持：Spring Boot 可以自動配置H2, HSQL and Derby 數據庫，不需要提供任何的鏈接URLs，只需要加入相應的jar包，Spring boot可以自動發現裝配
<!-- 數據庫 -->
<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&characterEncoding=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會自動識別url。
2.數據連接池默認使用tomcat-jdbc
連接池的配置：spring.datasource.tomcat.*
二、 JdbcTemplate模板
// 自動註冊
@Autowired
private JdbcTemplate jdbcTemplate;
三、 腳本
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=1DEFAULT CHARSET=utf8 COMMENT='用戶表';
四、實體類
/**
* 實體類
*
* @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、實現類代碼
@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);
}
七、測試類代碼
@Autowired
private RoncooUserDao roncooUserDao;
@Test
public void insert() {
RoncooUser roncooUser = new RoncooUser();
roncooUser.setName("測試");
roncooUser.setCreateTime(new Date());
int result = roncooUserDao.insert(roncooUser);
System.out.println(result);
}
@Test
public void delete() {
int result = roncooUserDao.deleteById(1);
System.out.println(result);
}
@Test
public void update() {
RoncooUser roncooUser = new RoncooUser();
roncooUser.setId(2);
roncooUser.setName("測試2");
roncooUser.setCreateTime(new Date());
int result = roncooUserDao.updateById(roncooUser);
System.out.println(result);
}
@Test
public void select() {
RoncooUser result = roncooUserDao.selectById(2);
System.out.println(result);
}
打印sql語句，添加如下
<logger name="org.springframework.jdbc.core.JdbcTemplate" level="debug"/>
八、封裝spring jdbc，帶分頁Spring Boot 基礎教程 作者：馮永偉
5 龍果學院：http://www.roncoo.com
/**
* 獲取當前事務最後一次更新的主鍵值
*/
public Long getLastId() {
return jdbcTemplate.queryForObject("select last_insert_id() as id", Long.class);
}
/**
* 獲取對象信息
*/
public <T> T queryForObject(String sql, Class<T> clazz, Object... args) {
Assert.hasText(sql, "sql 語句不能爲空");
return jdbcTemplate.queryForObject(sql, new BeanPropertyRowMapper<T>(clazz), args);
}
/**
* 獲取對象集合信息
*/
public <T> List<T> queryForObjectList(String sql, Class<T> clazz, Object... args) {
Assert.hasText(sql, "sql 語句不能爲空");
return jdbcTemplate.query(sql, args, new BeanPropertyRowMapper<T>(clazz));
}
/**
* 分頁，jdbcTemplate 不支持like自定義，只能拼裝
*/
public Page<Map<String, Object>> queryForPage(String sql, int pageCurrent, int pageSize, Object... args) {
Assert.hasText(sql, "sql 語句不能爲空");
Assert.isTrue(pageCurrent >= 1, "pageNo 必須大於等於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);
}
/**
* 分頁，jdbcTemplate 不支持like是定義，只能拼裝
*
public <T> Page<T> queryForPage(String sql, int pageCurrent, int pageSize, Class<T> clazz, Object... args) {
Assert.hasText(sql, "sql 語句不能爲空");
Assert.isTrue(pageCurrent >= 1, "pageNo 必須大於等於1");
Assert.isTrue(clazz != null, "clazz 不能爲空");
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), args);
return new Page<T>(count, totalPage, pageCurrent, pageSize, list);
}
測試
@Test
public void select2() {
RoncooUser result = roncooUserDao.selectById(7);
System.out.println(result);
}
// 分頁測試
@Test
public void queryForPage(){
Page<RoncooUser> result = roncooUserDao.queryForPage(1, 20, "測試");
System.out.println(result.getList());
}
實現類
@Override
public Page<RoncooUser> queryForPage(int pageCurrent, int pageSize, String name){
// 確定參數
/*String sql = "select * from roncoo_user where name=?";
return queryForPage(sql.toString(), pageCurrent, pageSize, RoncooUser.class, name);*/
// 若name可能爲空，則要進行判定，如下
/*StringBuffer sql = new StringBuffer("select * from roncoo_user where 1"); Spring Boot 基礎教程 作者：馮永偉
7 龍果學院：http://www.roncoo.com
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查詢，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);
} }