first commit for openGauss connector jdbc

docs/documentation/92/escapes-datetime.md

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+---
+layout: default_docs
+title: Date-time escapes
+header: Chapter 8. JDBC escapes
+resource: media
+previoustitle: Escape for outer joins
+previous: outer-joins-escape.html
+nexttitle: Escaped scalar functions
+next: escaped-functions.html
+---
+
+The JDBC specification defines escapes for specifying date, time and timestamp
+values which are supported by the driver.
+
+> date
+>> `{d 'yyyy-mm-dd'}` which is translated to `DATE 'yyyy-mm-dd'`
+
+> time
+>> `{t 'hh:mm:ss'}` which is translated to `TIME 'hh:mm:ss'`
+
+> timestamp
+>> `{ts 'yyyy-mm-dd hh:mm:ss.f...'}` which is translated to `TIMESTAMP 'yyyy-mm-dd hh:mm:ss.f'`<br /><br />
+>> The fractional seconds (.f...) portion of the TIMESTAMP can be omitted.