# How the AsBinary() function works in Mariadb?

The `AsBinary()`

function is a spatial function that returns the binary representation of a given geometry value. The `AsBinary()`

function can be used to convert a geometry value to a binary format that can be stored or transferred more efficiently.

MariaDB, a popular open-source database, offers a variety of functions to handle geospatial data. Among these is the `AsBinary()`

function, which is essential for converting geometry values into their binary representation. This article will guide you through the syntax, practical examples, and related functions of `AsBinary()`

in MariaDB.

## Syntax

The syntax for the MariaDB `AsBinary()`

function is as follows:

```
SELECT AsBinary(geometry_column) FROM table_name;
```

The `geometry_column`

should be a column or an expression that returns a geometry type. The function returns the Well-Known Binary (WKB) representation of the geometry.

## Examples

### Example 1: Basic Usage

To demonstrate the basic usage of `AsBinary()`

, consider the following query:

```
SELECT AsBinary(Shape) FROM SpatialTable;
```

This will return the binary representation of the `Shape`

column from `SpatialTable`

.

### Example 2: With Literal Geometry

Here’s how you can use `AsBinary()`

with a literal geometry value:

```
SELECT AsBinary(ST_GeomFromText('POINT(1 1)'));
```

The output will be the binary form of the given point.

### Example 3: In a WHERE Clause

`AsBinary()`

can also be used within a `WHERE`

clause:

```
SELECT Name FROM Cities WHERE AsBinary(Location) = AsBinary(ST_GeomFromText('POINT(2 2)'));
```

This query will find cities with the specified location.

### Example 4: Combined with Other Functions

Combining `AsBinary()`

with other functions can be very powerful:

```
SELECT AsBinary(ST_Buffer(Shape, 10)) FROM SpatialTable;
```

This will return the binary representation of the shapes buffered by 10 units.

### Example 5: Inserting Binary Geometry

You can also insert binary geometry data into a table:

```
INSERT INTO SpatialTable (Shape) VALUES (AsBinary(ST_GeomFromText('LINESTRING(0 0, 1 1, 2 2)')));
```

This inserts a linestring into `SpatialTable`

.

## Related Functions

Here are some functions related to `AsBinary()`

in MariaDB:

`ST_AsBinary()`

is a synonym for`AsBinary()`

and works in the same way.`ST_GeomFromText()`

takes a Well-Known Text (WKT) representation of geometry and returns a geometry type.`ST_Buffer()`

returns a geometry that represents all points whose distance from the given geometry is less than or equal to a specified value.

## Conclusion

The `AsBinary()`

function is a handy tool for working with binary representations of geometric data in MariaDB. Whether you’re storing, retrieving, or manipulating spatial data, `AsBinary()`

provides a straightforward way to handle binary geometry. Understanding its usage and related functions can greatly enhance your geospatial data management in MariaDB.