关于数据库插入单引号

今天遇到一个前台接受一个带单引号的数据 eg:'欧拉欧拉   插入数据库会报以下错误

org.springframework.dao.DataIntegrityViolationException:
### Error querying database. Cause: java.sql.SQLException: Invalid SQL statement or JDBC escape, terminating ''' not found.
### The error may exist in com/cn/persistence/KnowQuestionMapper.xml
### The error may involve com.cn.persistence.KnowQuestionMapper.selectKnowQuestionList
### The error occurred while executing a query
### Cause: java.sql.SQLException: Invalid SQL statement or JDBC escape, terminating ''' not found.
; SQL []; Invalid SQL statement or JDBC escape, terminating ''' not found.; nested exception is java.sql.SQLException: Invalid SQL statement or JDBC escape, terminating ''' not found.

 

解决方案 :把单引号替换再加一个单引号转义

要插入的字符串,将其中的(’)替换成两个单引号(”)即可 。

 

 

public static void main(String[] args) throws Exception{


KnowQuestion ss=new KnowQuestion();

String str="I'm Iron Man" .replaceAll(" ' ", " '' ");;

String sql="insert into  knowQuestion VALUES(' "+str+" ');";

ss.operate(sql, 2);

System.out.println(str);

System.out.println(sql);
}

 

 eg:'欧拉欧拉 替换 ''欧拉欧拉

tip:注意替换时,string是final修饰的,是不可变的

"I'm Iron Man" .replaceAll(" ' ", " '' ");不可这样写,一定要把此新对象的引用再重新指向str,否则不会改变

String str="I'm Iron Man" .replaceAll(" ' ", " '' ");

 

参考文章 :http://www.itpub.net/thread-678193-1-1.html?tdsourcetag=s_pctim_aiomsg

posted @ 2019-09-03 13:35  逐星i  阅读(1156)  评论(0编辑  收藏  举报