
MariaDB Cookbook
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Reading data from a dynamic column is not the same as with traditional columns. Without some help from a set of special dynamic columns functions, the standard MariaDB SELECT
statements will not understand how to properly read the data stored in a dynamic columns BLOB
. They will see it as a BLOB
column and treat it like any other BLOB
. This recipe introduces and demonstrates the basic functions used when reading a dynamic column.
Complete the Creating tables with dynamic columns recipe and the Inserting, updating, and deleting dynamic column data recipe in this chapter.
Launch the mysql
command-line client. Connect to our MariaDB server and the test
database.
Discover the columns in our data:
SELECT id, COLUMN_LIST(dyn_cols) FROM dyn_example;
The following screenshot displays the columns in our data:
Read data from our table using the following commands:
SELECT id, COLUMN_GET(dyn_cols, 'name' AS CHAR) AS 'name', COLUMN_GET(dyn_cols...
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