String sql=" delete from rizhi where data="+data;为什么总是报错,data为varchar型.错误提示：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 ' at line 1

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String sql=
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String sql=" delete from rizhi where data="+data;为什么总是报错,data为varchar型.错误提示：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 ' at line 1
String sql=" delete from rizhi where data="+data;为什么总是报错,data为varchar型.
错误提示：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 ' at line 1

String sql=" delete from rizhi where data="+data;为什么总是报错,data为varchar型.错误提示：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 ' at line 1
String sql="delete from rizhi where `data`='" + data + "'";
varchar 型的值,需要用单引号包起来