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导出结果跟查询结果不一致_MySQL

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Release: 2016-06-01 12:59:03
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1、错误原因

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2、错误原因

上面左侧图是SQL语句查询出来的结果,右侧是导出Excel展示的数据,结果发现两者竟然不一致

 

3、解决办法

拼接的SQL:

 

sql.append("SELECT  CONCAT((@rowNum := @rowNum + 1),'') AS rownum,t.* FROM(");
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导出中的赋值:

Map<string,object> map=(Map<string, object="">) data.get(i);
            	HSSFRow datarow = sheet.createRow(i+1);  
                HSSFCell cell0 = datarow.createCell(0);  
                HSSFRichTextString t0 = new HSSFRichTextString((String)map.get("rownum")+"");  
                cell0.setCellValue(t0);</string,></string,object>
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rownum是数值型的,在循环中取值时,rownum变为null

Map<string,object> map=(Map<string, object="">) data.get(i);
            	HSSFRow datarow = sheet.createRow(i+1);  
                HSSFCell cell0 = datarow.createCell(0);  
                HSSFRichTextString t0 = new HSSFRichTextString(map.get("rownum")+"");  
                cell0.setCellValue(t0);
</string,></string,object>
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去掉map前的(String),并清除一下缓存


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