MySQL 查询如果字符串包含超过 10 个单词则添加点?
mysqlmysqli database
为此，使用 CASE 语句。让我们首先创建一个表 −
mysql> create table DemoTable -> ( -> Title text -> ); Query OK, 0 rows affected (0.61 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable values('My name is John and this is my first tutorial on MySQL');
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable values('This is Carol and I work on MongoDB');
Query OK, 1 row affected (0.19 sec)
使用 select 语句显示表中的所有记录 −
mysql> select *from DemoTable;
输出
这将产生以下输出 −
+--------------------------------------------------------+ | Title | +--------------------------------------------------------+ | My name is John and this is my first tutorial on MySQL | | This is Carol and I work on MongoDB | +--------------------------------------------------------+ 2 rows in set (0.00 sec)
以下是当字符串包含超过 10 个单词时添加点的查询 −
mysql> select (case when substring_index(tbl.Title, ' ', 10) = tbl.Title then tbl.Title -> else concat(substring_index(tbl.Title, ' ', 10), '....................') -> end) AS AddDots -> from DemoTable tbl;
输出
这将产生以下输出 −
+-------------------------------------------------------------------+ | AddDots | +-------------------------------------------------------------------+ | My name is John and this is my first tutorial.................... | | This is Carol and I work on MongoDB | +-------------------------------------------------------------------+ 2 rows in set (0.00 sec)
