MySQL 如何实现关键字搜索

要在MySQL中实现关键字搜索，可以使用LIKE运算符。语法如下-−

SELECT *FROM yourTableName
where yourColumnName Like ‘%anyKeywordName%’
or yourColumnName Like ‘%anyKeywordName%’;

为了更好地理解它，让我们首先创建一个表。以下是创建表的查询-−

mysql> create table KeywordSearchDemo
   −> (
   −> StudentId int
   −> ,
   −> StudentName varchar(100)
   −> );
Query OK, 0 rows affected (0.86 sec)

使用INSERT命令在表中插入一些记录。插入记录的查询如下−

mysql> insert into KeywordSearchDemo values(100,'Adam John');
Query OK, 1 row affected (0.40 sec)

mysql> insert into KeywordSearchDemo values(101,'John Smith');
Query OK, 1 row affected (0.17 sec)

mysql> insert into KeywordSearchDemo values(103,'John Taylor');
Query OK, 1 row affected (0.15 sec)

mysql> insert into KeywordSearchDemo values(104,'Carol Taylor');
Query OK, 1 row affected (0.21 sec)

mysql> insert into KeywordSearchDemo values(105,'Maria Garcia');
Query OK, 1 row affected (0.20 sec)

mysql> insert into KeywordSearchDemo values(106,'James Smith');
Query OK, 1 row affected (0.12 sec)

mysql> insert into KeywordSearchDemo values(110,'Mike Brown');
Query OK, 1 row affected (0.22 sec)

使用select语句从表中显示所有记录。查询如下−

mysql> select *from KeywordSearchDemo;

以下是输出−

+-----------+--------------+
| StudentId | StudentName  |
+-----------+--------------+
|       100 | Adam John    |
|       101 | John Smith   |
|       103 | John Taylor  |
|       104 | Carol Taylor |
|       105 | Maria Garcia |
|       106 | James Smith  |
|       110 | Mike Brown   |
+-----------+--------------+
7 rows in set (0.00 sec)

这里是选择与关键字相关的姓名的查询。查询如下−

mysql> select StudentName from KeywordSearchDemo
   −> where StudentName Like '%John%' or StudentName Like '%Taylor%';

显示包含关键字“John”和“Taylor”的记录的输出-−

+--------------+
| StudentName  |
+--------------+
| Adam John    |
| John Smith   |
| John Taylor  |
| Carol Taylor |
+--------------+
4 rows in set (0.10 sec)

您甚至可以从表中返回StudentId列。

mysql> select *from KeywordSearchDemo
   −> where StudentName Like '%John%' or StudentName Like '%Taylor%';

以下是输出−

+-----------+--------------+
| StudentId | StudentName  |
+-----------+--------------+
|       100 | Adam John    |
|       101 | John Smith   |
|       103 | John Taylor  |
|       104 | Carol Taylor |
+-----------+--------------+
4 rows in set (0.00 sec)

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