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More details can be found in the Partial Update of JSON Values section of the reference manual.

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If IGNORE is provided, all errors encountered during the update are ignored.

If an update on a row would result in a violation of a primary key or unique index, the update on that row is not performed.

A simple example is the following statement, which changes the , the storage engine will be told that it can simply overwrite the four bytes in the string “John” with the four bytes in “Knut”, and the rest of the value can be left untouched.

If the JSON value being updated had contained a longer name, like , the update could still be performed as a partial update.

As mentioned earlier, an option was added to make the binary log contain patches instead of the full JSON documents when we have partial updates.

Let’s try to enable that option: That’s more like it.There may be a requirement where the existing data in a My SQL table needs to be modified. This will modify any field value of any My SQL table.The following code block has a generic SQL syntax of the UPDATE command to modify the data in the My SQL table − The WHERE clause is very useful when you want to update the selected rows in a table.In that case, the storage engine would be told to overwrite the first four bytes of “Peter” with “Knut”, and to overwrite the length byte of the , there would not be enough room for the new name.In this case, the update will fall back to performing a full update, which means that it writes the whole new JSON value to the database.It can also be used with the JSON_REPLACE and JSON_REMOVE functions.

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