MySQL SQL 问题
SELECT FROM user WHERE user_id =
user_id = 全部 怎么写
补充代码，如果为空， urlname = ???; name = ???; email = ???; 这3个怎么写
public User get(String urlname, String name, String email) {
try {
if (urlname == null) {
urlname = ???;
}
if (name == null) {
name = ???;
}
if (email == null) {
email = ???;
}
String sql = "SELECT * FROM tz_user WHERE deleting = 0 AND urlname = ? AND name = ? AND email = ?";
RowMapper<User> rowMapper = new BeanPropertyRowMapper<User>(User.class);
User user = jdbcTemplate.queryForObject(sql, rowMapper, urlname, name, email);
return user;
} catch (Exception e) {
return null;
}
}
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判断 urlname, name, email为空的时候最好用 StringUtils.isNotBlank 来判断字符串是否不为空且长度不为0且不由空白符(whitespace)构成.
try { StringBuffer sql = "SELECT * FROM tz_user WHERE deleting = 0 "; if (StringUtils.isNotBlank(urlname)) { sql.append( "and urlname = "+ ???); } if (StringUtils.isNotBlank(name)) { sql.append( "and name= "+ ???); } if (StringUtils.isNotBlank(email)) { sql.append( "and email= "+ ???); } RowMapper rowMapper = new BeanPropertyRowMapper(User.class); User user = jdbcTemplate.queryForObject(sql.toString(), rowMapper, urlname, name, email); return user; } catch (Exception e) { return null; }2019-07-17 19:49:52赞同 展开评论
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