org.springframework.dao.EmptyResultDataAccessException

public Wcrash getWcrashInfo(int id) {
String sql = "select plateform_id,android_version,app_version_code,app_version_name,device_id,"
+ "model,brand,product,stack_trace,crash_date,package_name from wcrash where id = ? ";
return this.jdbcTemplate.queryForObject(
sql,
new Object[]{id},
new RowMapper<Wcrash>(){
@Override
public Wcrash mapRow(ResultSet rs, int i) throws SQLException {
Wcrash wcrash = new Wcrash();
wcrash.setPlateformId(toNullStr(rs.getString("plateform_id")));
wcrash.setAndroidVersion(toNullStr(rs.getString("android_version")));
wcrash.setAppVersionCode(toNullStr(rs.getString("app_version_code")));
wcrash.setAppVersionName(toNullStr(rs.getString("app_version_name")));
wcrash.setDeviceId(toNullStr(rs.getString("device_id")));
wcrash.setModel(toNullStr(rs.getString("model")));
wcrash.setBrand(toNullStr(rs.getString("brand")));
wcrash.setProduct(toNullStr(rs.getString("product")));
wcrash.setStackTrace(toNullStr(rs.getString("stack_trace")));
wcrash.setCrashDate(toNullStr(rs.getString("crash_date")));
wcrash.setPackageName(toNullStr(rs.getString("package_name")));
return wcrash;
}
});
}

异常信息：

org.springframework.dao.EmptyResultDataAccessException: Incorrect result size: expected 1, actual 0
at org.springframework.dao.support.DataAccessUtils.requiredSingleResult(DataAccessUtils.java:71)
at org.springframework.jdbc.core.JdbcTemplate.queryForObject(JdbcTemplate.java:729)

queryForObject无记录时会抛出异常，而对于query()list的类型不会抛出此异常。解决方法就是捕获这个异常然后在catch中返回null就可以。修改代码如下：

public Wcrash getWcrashInfo(int id) {
String sql = "select plateform_id,android_version,app_version_code,app_version_name,device_id,"
+ "model,brand,product,stack_trace,crash_date,package_name from wcrash where id = ? ";
try{
return this.jdbcTemplate.queryForObject(
sql,
new Object[]{id},
new RowMapper<Wcrash>(){
@Override
public Wcrash mapRow(ResultSet rs, int i) throws SQLException {
Wcrash wcrash = new Wcrash();
wcrash.setPlateformId(toNullStr(rs.getString("plateform_id")));
wcrash.setAndroidVersion(toNullStr(rs.getString("android_version")));
wcrash.setAppVersionCode(toNullStr(rs.getString("app_version_code")));
wcrash.setAppVersionName(toNullStr(rs.getString("app_version_name")));
wcrash.setDeviceId(toNullStr(rs.getString("device_id")));
wcrash.setModel(toNullStr(rs.getString("model")));
wcrash.setBrand(toNullStr(rs.getString("brand")));
wcrash.setProduct(toNullStr(rs.getString("product")));
wcrash.setStackTrace(toNullStr(rs.getString("stack_trace")));
wcrash.setCrashDate(toNullStr(rs.getString("crash_date")));
wcrash.setPackageName(toNullStr(rs.getString("package_name")));
return wcrash;
}
});
}catch(EmptyResultDataAccessException e){
return null;
}
}