fix issue client-adapter.rdb模块在转换时间时丢失精度 #5052 (#5053)

* fix the issue that client-adapter.rdb module loses precision when converting microsencond time

* fix the issue that client-adapter.rdb module loses precision when converting to java.sql.Time or java.sql.Timestamp

* fix the issue that client-adapter.rdb module loses precision when converting to java.sql.Time or java.sql.Timestamp

client-adapter/common/src/main/java/com/alibaba/otter/canal/client/adapter/support/Util.java

@@ -327,4 +327,53 @@ public class Util {
 
         return null;
     }
+
+    /**
+     * Check if the time string has millisecond or microsecond units
+     * @param timeStr time string
+     * @return boolean
+     */
+    public static boolean isAccuracyOverSecond(String timeStr){
+        if (StringUtils.isEmpty(timeStr)) {
+            return false;
+        }
+        String[] times = StringUtils.split(timeStr, ".");
+        return times.length > 1 && !times[times.length - 1].isEmpty();
+    }
+
+
+    /**
+     * Check if the datetime string has microsecond or nanosecond units
+     * @param datetimeStr datetime string
+     * @return boolean
+     */
+    public static boolean isAccuracyOverMillisecond(String datetimeStr){
+        if (StringUtils.isEmpty(datetimeStr)) {
+            return false;
+        }
+        String[] times = StringUtils.split(datetimeStr, ".");
+        return times.length > 1 && times[times.length - 1].length() > 3;
+    }
+
+
+    /**
+     * MySQL has fractional seconds support for TIME, DATETIME, and TIMESTAMP values, with up to microseconds (6 digits) precision.
+     * ISO-8601 standard format is with up to nanoseconds (9 digits) precision, which is sufficient for storing MySQL time-related data.
+     * @param datetimeStr datetime string
+     * @return LocalDateTime
+     */
+    public static LocalDateTime parseISOLocalDateTime(String datetimeStr) {
+        if (StringUtils.isEmpty(datetimeStr)) {
+            return null;
+        }
+        datetimeStr = datetimeStr.trim();
+        try {
+            //Replace SPACE in middle with `T` to comply with ISO-8601 standard format
+            return LocalDateTime.parse(datetimeStr.replace(" ", "T"));
+        }catch (Exception e){
+            logger.error("Convert datetime string to ISOLocalDateTime fail:{}", datetimeStr, e);
+        }
+        return null;
+    }
+
 }