One exception is when using JSON_EXTRACT() in which case strings are unescaped before comparison. In MariaDB JSON strings are normal strings and compared as strings.
In MySQL, JSON is an object and is compared according to json values. Use mariadb-dump/mysqldump to copy the table.ĭifferences Between MySQL JSON Strings and MariaDB JSON Strings. After this, MariaDB can directly use the table without any need for a dump and restore. An example demonstrating the working of the MariaDB JSONQUERY function on the JSON document is given below. path It define path from which object or array is generated. JSONQUERY(jsondoc, path) Here: jsondoc JSON document that contaisn the key-value pair within curly braces. Change the JSON column to type TEXT in MySQL. The syntax of MariaDB JSONQUERY is given below. See Making MariaDB understand MySQL JSON. From MariaDB 10.5.7, see the you can use the mysql_json plugin. There are a a few different ways to move the table to MariaDB: MariaDB can't directly access MySQL's JSON format. 
Then you replicate from this intermediate slave to MariaDB.Ĭonverting a MySQL TABLE with JSON Fields to MariaDB
If you must use row-based replication and cannot change the MySQL master from JSON to TEXT, you can try to introduce an intermediate MySQL slave and change the column type from JSON to TEXT on it. 
Change the JSON column to type TEXT in MySQL. There are a a few different ways to solve this: This means that row based replication will not work for JSON types from MySQL to MariaDB. The JSON type in MySQL stores the JSON object in a compact form, not as LONGTEXT as in MariaDB. Replicating JSON Data Between MySQL and MariaDB | Field | Type | Null | Key | Default | Extra |ĮRROR 4025 (23000): CONSTRAINT `j` failed for `test`.`t2` 
This constraint is automatically included for types using the JSON alias from MariaDB 10.4.3. In order to ensure that a a valid json document is inserted, the JSON_VALID function can be used as a CHECK constraint. MariaDB implements this as a LONGTEXT rather, as the JSON data type contradicts the SQL standard, and MariaDB's benchmarks indicate that performance is at least equivalent. JSON is an alias for LONGTEXT introduced for compatibility reasons with MySQL's JSON data type.
Differences Between MySQL JSON Strings and MariaDB JSON Strings. Converting a MySQL TABLE with JSON Fields to MariaDB. Replicating JSON Data Between MySQL and MariaDB.
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