Java学习之Sql语句中包含单引号进行转换。
业务场景:
某个需求开发中需要更新数据库中的字段,但是字段中包含特殊字段:单引号('),然后与Sql语句冲突。
新建数据库"people"(字段:id、name、status、content)
新增数据:1、zhangsan、1、'测试'。
需求:需要把content字段中的('测试') 改为('hello')
注意:目的要改成:'hello',不是:hello
问题:
此时单纯写Sql或者在系统中更新'content'字段会报错:
update people set content = ''hello'' where id = 1;
Error Code: 1064. 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 'hello'' where id = 1' at line 1。
String content = "'hello'"; String sql = "update people set content = '"+content +"' where id = 1"; service.excuteSql(sql );
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 'hello'' where id = 1' at line 1。
解决办法:
用两个单引号代替一个单引号(注意:两个单引号,不是双引号!)
update people set content = '''hello''' where id = 1;
String content = "'hello'";
if (content.contains("'")) {
content.replace("'", "\'\'");
}
String sql = "update people set content = '" + content + "' where id = 1";
service.excuteSql(sql);