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spring boot jdbcTemplete操作关系型数据库

spring boot jdbcTemplete操作关系型数据库

作者: 逗比punk | 来源:发表于2017-07-14 23:49 被阅读72次
    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&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 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';
    
    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
     @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.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) {
    roncooUser.getName(),
    String sql = "update roncoo_user set name=?, create_time=? where id=?";
    return jdbcTemplate.update(sql, roncooUser.getCreateTime(), roncooUser.getId());
    }
         @Override
         public RoncooUser selectById(int id) {
    roncooUser.getName(),
    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

    @Autowired
    private RoncooUserDao roncooUserDao;
    @Test
     public void insert() {
    RoncooUser roncooUser = new RoncooUser(); roncooUser.setName("测试"); 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("测试 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 语句,添加如下

    <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); }
    
    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);
    }}
    

    page.java

    /**
     * 数据分页组件
     * 
     * @author wujing
     */
    public class Page<T> implements Serializable {
        private static final long serialVersionUID = -5764853545343945831L;
    
        /**
         * 默认每页记录数(20)
         */
        public static final int DEFAULT_PAGE_SIZE = 20;
    
        /**
         * 最大每页记录数(1000)
         */
        public static final int MAX_PAGE_SIZE = 1000;
    
        /**
         * 当前分页的数据集
         */
        private List<T> list;
    
        /**
         * 总记录数
         */
        private int totalCount;
    
        /**
         * 总页数
         */
        private int totalPage;
    
        /**
         * 当前页
         */
        private int pageCurrent;
    
        /**
         * 每页记录数
         */
        private int pageSize;
    
        /**
         * 排序字段
         */
        private String orderField;
    
        /**
         * 排序方式:asc or desc
         */
        private String orderDirection;
    
        /**
         * 默认构造函数
         */
        public Page() {
        }
    
        /**
         * 构造函数
         * 
         * @param totalCount
         *            总记录数
         * @param totalPage
         *            总页数
         * @param pageCurrent
         * @param pageSize
         * @param list
         */
        public Page(int totalCount, int totalPage, int pageCurrent, int pageSize, List<T> list) {
            this.totalCount = totalCount;
            this.totalPage = totalPage;
            this.pageCurrent = pageCurrent;
            this.pageSize = pageSize;
            this.list = list;
        }
    
        public List<T> getList() {
            return list;
        }
    
        public void setList(List<T> list) {
            this.list = list;
        }
    
        public int getTotalCount() {
            return totalCount;
        }
    
        public void setTotalCount(int totalCount) {
            this.totalCount = totalCount;
        }
    
        public int getTotalPage() {
            return totalPage;
        }
    
        public void setTotalPage(int totalPage) {
            this.totalPage = totalPage;
        }
    
        public int getPageCurrent() {
            return pageCurrent;
        }
    
        public void setPageCurrent(int pageCurrent) {
            this.pageCurrent = pageCurrent;
        }
    
        public int getPageSize() {
            return pageSize;
        }
    
        public void setPageSize(int pageSize) {
            this.pageSize = pageSize;
        }
    
        public String getOrderField() {
            return orderField;
        }
    
        public void setOrderField(String orderField) {
            this.orderField = orderField;
        }
    
        public String getOrderDirection() {
            return orderDirection;
        }
    
        public void setOrderDirection(String orderDirection) {
            this.orderDirection = orderDirection;
        }
    
    }
    

    sql.java

    /**
     * sql工具类
     * 
     * @author wujing
     */
    public class Sql {
        private Sql() {
        }
    
        /**
         * 检测sql,防止sql注入
         * 
         * @param sql
         *            sql
         * @return 正常返回sql;异常返回""
         */
        public static String checkSql(String sql) {
            String inj_str = "'|and|exec|insert|select|delete|update|count|*|%|chr|mid|master|truncate|char|declare|;|or|-|+|,";
            String inj_stra[] = inj_str.split("\\|");
            for (int i = 0; i < inj_stra.length; i++) {
                if (sql.indexOf(inj_stra[i]) >= 0) {
                    return "";
                }
            }
            return sql;
        }
    
        /**
         * 计算总页数
         *
         * @param totalCount
         *            总记录数.
         * @param pageSize
         *            每页记录数.
         * @return totalPage 总页数.
         */
        public static int countTotalPage(final int totalCount, final int pageSize) {
            if (totalCount % pageSize == 0) {
                return totalCount / pageSize; // 刚好整除
            } else {
                return totalCount / pageSize + 1; // 不能整除则总页数为:商 + 1
            }
        }
    
        /**
         * 校验当前页数pageCurrent<br/>
         * 1、先根据总记录数totalCount和每页记录数pageSize,计算出总页数totalPage<br/>
         * 2、判断页面提交过来的当前页数pageCurrent是否大于总页数totalPage,大于则返回totalPage<br/>
         * 3、判断pageCurrent是否小于1,小于则返回1<br/>
         * 4、其它则直接返回pageCurrent
         *
         * @param totalCount
         *            要分页的总记录数
         * @param pageSize
         *            每页记录数大小
         * @param pageCurrent
         *            输入的当前页数
         * @return pageCurrent
         */
        public static int checkPageCurrent(int totalCount, int pageSize, int pageCurrent) {
            int totalPage = countTotalPage(totalCount, pageSize); // 最大页数
            if (pageCurrent > totalPage) {
                // 如果页面提交过来的页数大于总页数,则将当前页设为总页数
                // 此时要求totalPage要大于获等于1
                if (totalPage < 1) {
                    return 1;
                }
                return totalPage;
            } else if (pageCurrent < 1) {
                return 1; // 当前页不能小于1(避免页面输入不正确值)
            } else {
                return pageCurrent;
            }
        }
    
        /**
         * 校验页面输入的每页记录数pageSize是否合法<br/>
         * 1、当页面输入的每页记录数pageSize大于允许的最大每页记录数MAX_PAGE_SIZE时,返回MAX_PAGE_SIZE
         * 2、如果pageSize小于1,则返回默认的每页记录数DEFAULT_PAGE_SIZE
         *
         * @param pageSize
         *            页面输入的每页记录数
         * @return checkPageSize
         */
        public static int checkPageSize(int pageSize) {
            if (pageSize > Page.MAX_PAGE_SIZE) {
                return Page.MAX_PAGE_SIZE;
            } else if (pageSize < 1) {
                return Page.DEFAULT_PAGE_SIZE;
            } else {
                return pageSize;
            }
        }
    
        /**
         * 计算当前分页的开始记录的索引
         *
         * @param pageCurrent
         *            当前第几页
         * @param pageSize
         *            每页记录数
         * @return 当前页开始记录号
         */
        public static int countOffset(final int pageCurrent, final int pageSize) {
            return (pageCurrent - 1) * pageSize;
        }
    
        /**
         * 根据总记录数,对页面传来的分页参数进行校验,并返分页的SQL语句
         *
         * @param pageCurrent
         *            当前页
         * @param pageSize
         *            每页记录数
         * @param pageBean
         *            DWZ分页查询参数
         * @return limitSql
         */
        public static String limitSql(int totalCount, int pageCurrent, int pageSize) {
            // 校验当前页数
            pageCurrent = checkPageCurrent(totalCount, pageSize, pageCurrent);
            pageSize = checkPageSize(pageSize); // 校验每页记录数
            return " limit " + countOffset(pageCurrent, pageSize) + "," + pageSize;
        }
    
        /**
         * 根据分页查询的SQL语句,获取统计总记录数的语句
         *
         * @param sql
         *            分页查询的SQL
         * @return countSql
         */
        public static String countSql(String sql) {
            String countSql = sql.substring(sql.toLowerCase().indexOf("from")); // 去除第一个from前的内容
            return "select count(*) " + removeOrderBy(countSql);
        }
    
        /**
         * 移除SQL语句中的的order by子句(用于分页前获取总记录数,不需要排序)
         *
         * @param sql
         *            原始SQL
         * @return 去除order by子句后的内容
         */
        private static String removeOrderBy(String sql) {
            Pattern pat = Pattern.compile("order\\s*by[\\w|\\W|\\s|\\S]*", Pattern.CASE_INSENSITIVE);
            Matcher mc = pat.matcher(sql);
            StringBuffer strBuf = new StringBuffer();
            while (mc.find()) {
                mc.appendReplacement(strBuf, "");
            }
            mc.appendTail(strBuf);
            return strBuf.toString();
        }
    }
    

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