blocks|key|287882|text|当连接时，您会看到在fpp_alarm语句和where语句之间没有空格。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|287883|select+*+from+fpp_alarmwhere+id+=+?+|code-block|syntax|javascript|287884|在SQL文字字符串中添加该空格，无论是在fpp_alarm之后还是在where之前。|287885|entityMap^0|A|9|M|5|0|0|K|9|Y|5|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|N|$]]

When concatenated, you see that there is no space between <code>fpp_alarm</code> and <code>where</code> in your SQL statement. 

<pre><code>select * from fpp_alarmwhere id = ? 
</code></pre>

Add that space in your SQL literal string, either after <code>fpp_alarm</code> or before <code>where</code>.

blocks|key|5403377|text|之间没有空隙|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5403378|pp_alarm"%2B+"wher|code-block|syntax|javascript|5403379|应该是...pp_alarm"+%2B+"+where+...|offset|length|style|CODE|5403380|entityMap^0|0|0|3|Q|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

There are no space between 

<pre><code>pp_alarm"+ "wher
</code></pre>

Should be 
<code>...pp_alarm" + " where ...</code>

blocks|key|5403419|text|假设|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5403420|String+query="select+*+from+fpp_alarm"%2B+"where+id+=+?";|code-block|syntax|javascript|5403421|当对其进行评估时，结果就像|5403422|select+*+from+fpp_alarmwhere+id+=+?+
//+the+%2B+sign+concatenates+the+two+pieces+of+String+
//+into+one+with+no+space+between+them+you+can+either+solve+it+by+doing+this

String+query="select+*+from+fpp_alarm+"%2B+"where+id+=+?";+//+space+after+fpp_alarm|5403423|但我并不认为在这里使用%2B只是像这样|5403424|String+query="select+*+from+fpp_alarm+where+id+=+?";|5403425|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Suppose that

<pre><code>String query="select * from fpp_alarm"+ "where id = ?";
</code></pre>

when this gets evaluated it turns out to be like

<pre><code>select * from fpp_alarmwhere id = ? 
// the + sign concatenates the two pieces of String 
// into one with no space between them you can either solve it by doing this

String query="select * from fpp_alarm "+ "where id = ?"; // space after fpp_alarm
</code></pre>

but I don't really see the use of + out here simply try like this

<pre><code>String query="select * from fpp_alarm where id = ?";
</code></pre>

I get an error when I execute the following code.

<pre class="lang-java prettyprint-override"><code>preparedStatement = connection.prepareStatement("select * from fpp_alarm"+ "where id = ? ");
preparedStatement.setString(1, id); //string id = "4"
ResultSet resultSet = preparedStatement.executeQuery();
</code></pre>

The error is :

<pre><code>You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '= '4'' at line 1.
</code></pre>

I have seen the similar questions here: <a href="https://stackoverflow.com/questions/21232923/preparedstatement-sql-error">preparedStatement SQL Error</a>

But, I can't find the 'reserved word' of mysql in my code. It's also right when execute this query in mysql.

preparedStatement SQL error in java

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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当我执行以下代码时，会得到一个错误。preparedStatement = connection.prepareStatement("select * from fpp_alarm"+ "where id = ? ");preparedStatement.setString(1, id);   //string id ...

问java中的preparedStatement SQL错误
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