文章目录
- 实际需求
- 分析思路
- 写拼接 SQL 脚本的脚本语句
- 执行得到脚本语句
- 保存成 SQL 脚本文件
实际需求
有些行政区域的字段 area_fullname 是空的，如何补全呢？如下所示：
分析思路
（一）如何取到每个区域的上级名称和上上级名称？
区域编码有规律，末尾有2个0的是上级，末尾有3个0 的是上上级，从而可以通过截取字符串、拼接字符串、关联子查询来得到。
（二）用到哪些技术点？
- 截取字符串函数
- 拼接字符串函数
- 空值转换函数
- 关联子查询
上级：(ifnull((select b.area_name from td_area_test b where b.area_code
= concat(left(a.area_code,4),'00')),'')) superior上上级：(ifnull((select c.area_name from td_area_test c where c.area_code
= concat(left(a.area_code,3),'000')),'')) superlative本级：a.area_name inferior
把 area_fullname 为空的区域的名称，上级名称，上上级名称查询出来，语句如下：
select a.area_code,a.area_name as inferior,
(ifnull((select b.area_name from td_area_test b
where b.area_code = concat(left(a.area_code,4),'00')),'')) superior,
(ifnull((select c.area_name from td_area_test c
where c.area_code = concat(left(a.area_code,3),'000')),'')) superlative
from td_area_test a where a.area_fullname ='';
写拼接 SQL 脚本的脚本语句
批量生成 SQL 脚本语句的脚本语句如下：
select concat('update td_area_test set area_fullname = ''',(concat((ifnull((select c.area_name from td_area_test c
where c.area_code = concat(left(a.area_code,3),'000')),'')),(ifnull((select b.area_name from td_area_test b where
b.area_code = concat(left(a.area_code,4),'00')),'')),a.area_name)),''' where area_code = ''',a.area_code,''';')
sqlsentence from td_area_test a where a.area_fullname = '';
执行得到脚本语句
执行上述脚本语句后得到如下结果：
mysql> select concat('update td_area_test set area_fullname = ''',(concat((ifnull((select c.area_name from td_area_test c where c.area_code = concat(left(a.area_code,3),'000')),'')),(ifnull((select b.area_name from td_area_test b where b.area_code = concat(left(a.area_code,4),'00')),'')),a.area_name)),''' where area_code = ''',a.area_code,''';') sqlsentence from td_area_test a where a.area_fullname = '';
+---------------------------------------------------------------------------------------------------------------------------------------------------------+
| sqlsentence |
+---------------------------------------------------------------------------------------------------------------------------------------------------------+
| update td_area_test set area_fullname = '内蒙古自治区赤峰市敖汉旗' where area_code = '150430'; |
| update td_area_test set area_fullname = '锡林郭勒盟正蓝旗' where area_code = '152530'; |
| update td_area_test set area_fullname = '黑龙江省哈尔滨市香坊区' where area_code = '230110'; |
| update td_area_test set area_fullname = '黑龙江省齐齐哈尔市克东县' where area_code = '230230'; |
| update td_area_test set area_fullname = '黑龙江省伊春市五营区' where area_code = '230710'; |
| update td_area_test set area_fullname = '上海市杨浦区' where area_code = '310110'; |
| update td_area_test set area_fullname = '上海市奉贤区' where area_code = '310120'; |
| update td_area_test set area_fullname = '上海市崇明县' where area_code = '310230'; |
| update td_area_test set area_fullname = '江苏省淮安市盱眙县' where area_code = '320830'; |
| update td_area_test set area_fullname = '浙江省杭州市余杭区' where area_code = '330110'; |
| update td_area_test set area_fullname = '罗津' where area_code = '342201'; |
| update td_area_test set area_fullname = '福建省三明市建宁县' where area_code = '350430'; |
| update td_area_test set area_fullname = '江西省九江市彭泽县' where area_code = '360430'; |
| update td_area_test set area_fullname = '江西省赣州市宁都县' where area_code = '360730'; |
| update td_area_test set area_fullname = '江西省吉安市永新县' where area_code = '360830'; |
| update td_area_test set area_fullname = '抚州市抚州市广昌县' where area_code = '361030'; |
| update td_area_test set area_fullname = '抚州市上饶市婺源县' where area_code = '361130'; |
| update td_area_test set area_fullname = '山东省济宁市汶上县' where area_code = '370830'; |
| update td_area_test set area_fullname = '许昌市南阳市桐柏县' where area_code = '411330'; |
| update td_area_test set area_fullname = '湖南省长沙市安居区' where area_code = '430185'; |
| update td_area_test set area_fullname = '湖南省株洲市芦松区' where area_code = '430282'; |
| update td_area_test set area_fullname = '湖南省常德市贺家山原种场' where area_code = '430782'; |
| update td_area_test set area_fullname = '湖南省常德市德山开发区' where area_code = '430783'; |
| update td_area_test set area_fullname = '湖南省常德市西湖管理区' where area_code = '430784'; |
| update td_area_test set area_fullname = '湖南省常德市西洞庭管理区' where area_code = '430785'; |
| update td_area_test set area_fullname = '湖南省益阳市大通湖区' where area_code = '430940'; |
| update td_area_test set area_fullname = '郴州市怀化通道侗族自治县' where area_code = '431230'; |
| update td_area_test set area_fullname = '郴州市怀化洪江区' where area_code = '431282'; |
| update td_area_test set area_fullname = '湘西土家族苗族自治州龙山县' where area_code = '433130'; |
| update td_area_test set area_fullname = '广西壮族自治区桂林市平乐县' where area_code = '450330'; |
| update td_area_test set area_fullname = '百色市百色市西林县' where area_code = '451030'; |
| update td_area_test set area_fullname = '省直辖县级行政区划省直辖县级行政区划琼中黎族苗族自治县' where area_code = '469030'; |
| update td_area_test set area_fullname = '重庆市万盛区' where area_code = '500110'; |
| update td_area_test set area_fullname = '重庆市丰都县' where area_code = '500230'; |
| update td_area_test set area_fullname = '重庆市石柱土家族自治县' where area_code = '500240'; |
| update td_area_test set area_fullname = '阿坝藏族羌族自治州壤塘县' where area_code = '513230'; |
| update td_area_test set area_fullname = '甘孜藏族自治州德格县' where area_code = '513330'; |
| update td_area_test set area_fullname = '凉山彝族自治州金阳县' where area_code = '513430'; |
| update td_area_test set area_fullname = '贵州省遵义市习水县' where area_code = '520330'; |
| update td_area_test set area_fullname = '铜仁地区万山特区' where area_code = '522230'; |
| update td_area_test set area_fullname = '黔东南苗族侗族自治州台江县' where area_code = '522630'; |
| update td_area_test set area_fullname = '黔南布依族苗族自治州龙里县' where area_code = '522730'; |
| update td_area_test set area_fullname = '云南省昭通市水富县' where area_code = '530630'; |
| update td_area_test set area_fullname = '红河哈尼族彝族自治州金平苗族瑶族傣族自治县' where area_code = '532530'; |
| update td_area_test set area_fullname = '大理白族自治州洱源县' where area_code = '532930'; |
| update td_area_test set area_fullname = '日喀则地区仁布县' where area_code = '542330'; |
| update td_area_test set area_fullname = '那曲地区尼玛县' where area_code = '542430'; |
| update td_area_test set area_fullname = '陕西省宝鸡市凤县' where area_code = '610330'; |
| update td_area_test set area_fullname = '陕西省咸阳市淳化县' where area_code = '610430'; |
| update td_area_test set area_fullname = '陕西省延安市宜川县' where area_code = '610630'; |
| update td_area_test set area_fullname = '陕西省汉中市佛坪县' where area_code = '610730'; |
| update td_area_test set area_fullname = '陕西省榆林市清涧县' where area_code = '610830'; |
| update td_area_test set area_fullname = '克孜勒苏柯尔克孜自治州喀什地区巴楚县' where area_code = '653130'; |
+---------------------------------------------------------------------------------------------------------------------------------------------------------+
53 rows in set (0.01 sec)
保存成 SQL 脚本文件
上述生成的SQL 脚本语句直接从命令行复制粘贴到脚本文件中，要注意清除掉多余的符号 | ，然后在命令终端执行脚本文件即可，清理后如下：
update td_area_test set area_fullname = '内蒙古自治区赤峰市敖汉旗' where area_code = '150430';
update td_area_test set area_fullname = '锡林郭勒盟正蓝旗' where area_code = '152530';
update td_area_test set area_fullname = '黑龙江省哈尔滨市香坊区' where area_code = '230110';
update td_area_test set area_fullname = '黑龙江省齐齐哈尔市克东县' where area_code = '230230';
update td_area_test set area_fullname = '黑龙江省伊春市五营区' where area_code = '230710';
update td_area_test set area_fullname = '上海市杨浦区' where area_code = '310110';
update td_area_test set area_fullname = '上海市奉贤区' where area_code = '310120';
update td_area_test set area_fullname = '上海市崇明县' where area_code = '310230';
update td_area_test set area_fullname = '江苏省淮安市盱眙县' where area_code = '320830';
update td_area_test set area_fullname = '浙江省杭州市余杭区' where area_code = '330110';
update td_area_test set area_fullname = '罗津' where area_code = '342201';
update td_area_test set area_fullname = '福建省三明市建宁县' where area_code = '350430';
update td_area_test set area_fullname = '江西省九江市彭泽县' where area_code = '360430';
update td_area_test set area_fullname = '江西省赣州市宁都县' where area_code = '360730';
update td_area_test set area_fullname = '江西省吉安市永新县' where area_code = '360830';
update td_area_test set area_fullname = '抚州市抚州市广昌县' where area_code = '361030';
update td_area_test set area_fullname = '抚州市上饶市婺源县' where area_code = '361130';
update td_area_test set area_fullname = '山东省济宁市汶上县' where area_code = '370830';
update td_area_test set area_fullname = '许昌市南阳市桐柏县' where area_code = '411330';
update td_area_test set area_fullname = '湖南省长沙市安居区' where area_code = '430185';
update td_area_test set area_fullname = '湖南省株洲市芦松区' where area_code = '430282';
update td_area_test set area_fullname = '湖南省常德市贺家山原种场' where area_code = '430782';
update td_area_test set area_fullname = '湖南省常德市德山开发区' where area_code = '430783';
update td_area_test set area_fullname = '湖南省常德市西湖管理区' where area_code = '430784';
update td_area_test set area_fullname = '湖南省常德市西洞庭管理区' where area_code = '430785';
update td_area_test set area_fullname = '湖南省益阳市大通湖区' where area_code = '430940';
update td_area_test set area_fullname = '郴州市怀化通道侗族自治县' where area_code = '431230';
update td_area_test set area_fullname = '郴州市怀化洪江区' where area_code = '431282';
update td_area_test set area_fullname = '湘西土家族苗族自治州龙山县' where area_code = '433130';
update td_area_test set area_fullname = '广西壮族自治区桂林市平乐县' where area_code = '450330';
update td_area_test set area_fullname = '百色市百色市西林县' where area_code = '451030';
update td_area_test set area_fullname = '省直辖县级行政区划省直辖县级行政区划琼中黎族苗族自治县' where area_code = '469030';
update td_area_test set area_fullname = '重庆市万盛区' where area_code = '500110';
update td_area_test set area_fullname = '重庆市丰都县' where area_code = '500230';
update td_area_test set area_fullname = '重庆市石柱土家族自治县' where area_code = '500240';
update td_area_test set area_fullname = '阿坝藏族羌族自治州壤塘县' where area_code = '513230';
update td_area_test set area_fullname = '甘孜藏族自治州德格县' where area_code = '513330';
update td_area_test set area_fullname = '凉山彝族自治州金阳县' where area_code = '513430';
update td_area_test set area_fullname = '贵州省遵义市习水县' where area_code = '520330';
update td_area_test set area_fullname = '铜仁地区万山特区' where area_code = '522230';
update td_area_test set area_fullname = '黔东南苗族侗族自治州台江县' where area_code = '522630';
update td_area_test set area_fullname = '黔南布依族苗族自治州龙里县' where area_code = '522730';
update td_area_test set area_fullname = '云南省昭通市水富县' where area_code = '530630';
update td_area_test set area_fullname = '红河哈尼族彝族自治州金平苗族瑶族傣族自治县' where area_code = '532530';
update td_area_test set area_fullname = '大理白族自治州洱源县' where area_code = '532930';
update td_area_test set area_fullname = '日喀则地区仁布县' where area_code = '542330';
update td_area_test set area_fullname = '那曲地区尼玛县' where area_code = '542430';
update td_area_test set area_fullname = '陕西省宝鸡市凤县' where area_code = '610330';
update td_area_test set area_fullname = '陕西省咸阳市淳化县' where area_code = '610430';
update td_area_test set area_fullname = '陕西省延安市宜川县' where area_code = '610630';
update td_area_test set area_fullname = '陕西省汉中市佛坪县' where area_code = '610730';
update td_area_test set area_fullname = '陕西省榆林市清涧县' where area_code = '610830';
update td_area_test set area_fullname = '克孜勒苏柯尔克孜自治州喀什地区巴楚县' where area_code = '653130';
