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++++
+
+title = "如何对单个字、词以及长句子进行检索" 
+
+date = "2023-07-21" 
+
+tags = ["数据库入门"] 
+
+archives = "2023-07" 
+
+author = "张翠娉" 
+
+summary = "如何对单个字、词以及长句子进行检索"
+
+img = "/zh/post/zhangcuiping/title/img.png" 
+
+times = "15:20"
+
++++
+
+# 如何对单个字、词以及长句子进行检索？
+
+1. 创建表并插入数据。
+
+   ```
+   Drop table if exists t_search;
+   
+   CREATE TABLE t_search (id int, title text, keyword text, abstract text, body text, ti tsvector);
+   
+   INSERT INTO t_search(id, title, keyword, abstract, body) VALUES (1, 'Northern area', 'Beijing', 'China','China, officially the People Republic of China (PRC), located in Asia, is the most populous state.');
+   
+   INSERT INTO t_search(id, title, keyword, abstract, body) VALUES (1, 'eastern area', 'Shanghai', 'China','China, located in east of China, is an international city.');
+   ```
+
+2. 对单个字进行全文检索。
+
+   ```
+   MogDB=# Select * from t_search where to_tsvector(keyword)@@ to_tsquery( 'Beijing' );
+    id |     title     | keyword | abstract |                                                body
+                 | ti
+   ----+---------------+---------+----------+--------------------------------------------------------------------------------------
+   --------------+----
+     1 | Northern area | Beijing | China    | China, officially the People Republic of China (PRC), located in Asia, is the most po
+   pulous state. |
+   (1 row)
+   ```
+
+3. 对单个词进行全文检索。
+
+   ```
+   MogDB=# Select * from t_search where to_tsvector(title)@@ plainto_tsquery( 'eastern area' );
+    id |    title     | keyword  | abstract |                            body                            | ti
+   ----+--------------+----------+----------+------------------------------------------------------------+----
+     1 | eastern area | Shanghai | China    | China, located in east of China, is an international city. |
+   (1 row)
+   ```
+
+4. 对长句子进行全文检索。
+
+   ```
+   MogDB=# Select * from t_search where to_tsvector(body)@@ plainto_tsquery( 'China, located in east of China, is an international city.' );
+    id |    title     | keyword  | abstract |                            body                            | ti
+   ----+--------------+----------+----------+------------------------------------------------------------+----
+     1 | eastern area | Shanghai | China    | China, located in east of China, is an international city. |
+   (1 row)
+   ```
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