java属性文件,为一个属性使用多行

Question

我将sql存储在属性文件中,并使用spring注入它,这有效:

someSQL = select result from myTable where y = 2 and x = ? order by z

但为了便于阅读,我想要这个:

    someSQL = select result 
              from myTable 
              where y = 2  
              and x = ? 
              order by z

我需要使用哪种正确的文本格式？

Answer 1

在行尾使用\就像

  someSQL = select result \
              from myTable \
              where y = 2  \
              and x = ? \
              order by z

此外,请注意任何尾随空格,因为Java在组装行时会查找连续的反斜杠+换行符.

换句话说:反斜杠必须是换行符之前的最后一个字符.

Answer 2

你添加\(斜杠)继续下一行.属性文件将是这样的 -

prop1=first line of prop1 \
second line of prop1\
third line of prop1
prop2=first line of prop2 \n \
second line of prop2 \n \
third line of prop2

Answer 3

使用\ 换行并确保每个\前有一个空格

   someSQL = select result \
              from myTable \
              where y = 2  \
              and x = ? \
              order by z \

如果没有给出一个空格，输出将是这样的

 someSQL = select result\
              from myTable\
              where y = 2\
              and x = ?\
              order by z\
    someSQL=select resultfrom myTablewhere y = 2and x = ?order by z
              

这会导致

Java级别： java.sql.SQLSyntaxErrorException

和数据库级别 Missing Keyword