”;
Update Record command is used to modify the value of a particular record. SET is the basic command to update a particular field value.
The following statement is the basic syntax of the Update command.
UPDATE <class>|cluster:<cluster>|<recordID> [SET|INCREMENT|ADD|REMOVE|PUT <field-name> = <field-value>[,]*] |[CONTENT| MERGE <JSON>] [UPSERT] [RETURN <returning> [<returning-expression>]] [WHERE <conditions>] [LOCK default|record] [LIMIT <max-records>] [TIMEOUT <timeout>]
Following are the details about the options in the above syntax.
SET − Defines the field to update.
INCREMENT − Increments the specified field value by the given value.
ADD − Adds the new item in the collection fields.
REMOVE − Removes an item from the collection field.
PUT − Puts an entry into map field.
CONTENT − Replaces the record content with JSON document content.
MERGE − Merges the record content with a JSON document.
LOCK − Specifies how to lock the records between load and update. We have two options to specify Default and Record.
UPSERT − Updates a record if it exists or inserts a new record if it doesn’t. It helps in executing a single query in the place of executing two queries.
RETURN − Specifies an expression to return instead of the number of records.
LIMIT − Defines the maximum number of records to update.
TIMEOUT − Defines the time you want to allow the update run before it times out.
Example
Let us consider the same Customer table that we have used in the previous chapter.
| Sr.No. | Name | Age |
|---|---|---|
| 1 | Satish | 25 |
| 2 | Krishna | 26 |
| 3 | Kiran | 29 |
| 4 | Javeed | 21 |
| 5 | Raja | 29 |
Try the following query to update the age of a customer ‘Raja’.
Orientdb {db = demo}> UPDATE Customer SET age = 28 WHERE name = ''Raja''
If the above query is executed successfully, you will get the following output.
Updated 1 record(s) in 0.008000 sec(s).
To check the record of Customer table you can use the following query.
orientdb {db = demo}> SELECT FROM Customer
If the above query is executed successfully, you will get the following output.
----+-----+--------+----+-------+---- # |@RID |@CLASS |id |name |age ----+-----+--------+----+-------+---- 0 |#11:0|Customer|1 |satish |25 1 |#11:1|Customer|2 |krishna|26 2 |#11:2|Customer|3 |kiran |29 3 |#11:3|Customer|4 |javeed |21 4 |#11:4|Customer|5 |raja |28 ----+-----+--------+----+-------+----
”;