Groovy Sql get difference datetime compare with mysql cli - mysql

Question

In mysql cli, i get following result:
mysql> select * from words limit 1;
+----+------+--------------------+---------------------+---------------------+
| id | name | full | created_at | updated_at |
+----+------+--------------------+---------------------+---------------------+
| 30 | prpr | a full explanation | 2016-09-20 12:59:07 | 2016-09-20 12:59:07 |
+----+------+--------------------+---------------------+---------------------+
the "created_at" is 2016-09-20 12:59:07
but when i
static void main(String[] args) {
def c = Sql.newInstance("jdbc:mysql://127.0.0.1:3306/ro_test", "root", "root")
println c.rows("select * from words")[0]['created_at']
}
the output is
2016-09-21 05:30:58.0
I hope groovy code output is same with mysql cli, how to do that?

Answer 1

These two dates probably refer to (roughly) the same instant in time. Given that the dates are 5.5 hours apart, my guess is that the MySQL CLI is showing the date in the UTC timezone, whereas the Groovy code is showing the date in the UTC+05:30 (Indian) time zone.
In other words
2016-09-20 12:59:07 + 5.5 hours ≈ 2016-09-21 05:30:58.0

Answer 2

When I force specific timezone, it work
static void main(String[] args) {
def c = Sql.newInstance("jdbc:mysql://127.0.0.1:3306/ro_test", "root", "root")
def tz = TimeZone.default
def cal = Calendar.getInstance(TimeZone.getTimeZone("Asia/Shanghai"))
c.query("select * from words") { ResultSetImpl rs ->
while (rs.next()) {
println rs.getTimestamp(4, cal)
}
}
}
I think the best way is rewrite Groovy.sql.Sql#rows with above code, the full implementation is here:
List<LinkedHashMap> e2(String stmt) {
def cal = Calendar.getInstance(Time.timezone)
List<GroovyRowResult> rs = []
c.query(stmt) { ResultSetImpl rs2 ->
def md = rs2.metaData
int cc = md.columnCount
while (rs2.next()) {
def attrs = [:]
for (int i = 1; i <= cc; i++) {
def key = md.getColumnLabel(i)
def t = md.getColumnType(i)
def v
if (t == Types.TIMESTAMP) {
v = rs2.getTimestamp(i, cal)
} else {
v = rs2.getObject(i)
}
attrs[key] = v
}
rs.add(attrs)
}
}
rs
}