[#wallet-InMemoryWalletDatabase]
= xref:wallet.adoc[wallet]::InMemoryWalletDatabase
:relfileprefix: ../
:mrdocs:

An in‐memory SQLiteDatabase. Used as a temporary build artifact where no on‐disk persistence is needed.

== Synopsis

Declared in `<wallet/sqlite.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
class InMemoryWalletDatabase
    : public xref:wallet/SQLiteDatabase.adoc[SQLiteDatabase]
----

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:wallet/SQLiteDatabase.adoc[SQLiteDatabase]`
| An instance of this class represents one SQLite3 database.
|===

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:wallet/InMemoryWalletDatabase/2constructor.adoc[`InMemoryWalletDatabase`]         [.small]#[constructor]#
| Construct an in‐memory database.
| xref:wallet/SQLiteDatabase/Backup-02.adoc[`Backup`] 
| Back up the entire database to a file.
| xref:wallet/SQLiteDatabase/Close.adoc[`Close`]  [.small]#[virtual]#
| Close the database
| xref:wallet/SQLiteDatabase/Filename.adoc[`Filename`]  [.small]#[virtual]#
| Return the name of the database file.
| xref:wallet/InMemoryWalletDatabase/Files.adoc[`Files`]  [.small]#[virtual]#
| Return the paths to this database's files; empty since it lives in memory.
| xref:wallet/SQLiteDatabase/Format.adoc[`Format`]  [.small]#[virtual]#
| Return the name of this database's storage format.
| xref:wallet/SQLiteDatabase/HasActiveTxn.adoc[`HasActiveTxn`] 
| Return true if there is an on‐going txn in this connection
| xref:wallet/SQLiteDatabase/MakeBatch.adoc[`MakeBatch`]  [.small]#[virtual]#
| Make a SQLiteBatch connected to this database
| xref:wallet/SQLiteDatabase/Open.adoc[`Open`]  [.small]#[virtual]#
| Open the database if it is not already opened
| xref:wallet/SQLiteDatabase/Rewrite.adoc[`Rewrite`]  [.small]#[virtual]#
| Rewrite the entire database on disk
| xref:wallet/SQLiteDatabase/Verify.adoc[`Verify`] 
| Check the integrity of the database.
|===


== Data Members

[cols="1,4"]
|===
| Name| Description
| xref:wallet/SQLiteDatabase/m_db.adoc[`m_db`] 
| The underlying SQLite database connection.
| xref:wallet/WalletDatabase/m_refcount.adoc[`m_refcount`] 
| Counts the number of active database users to be sure that the database is not closed while someone is using it
| xref:wallet/SQLiteDatabase/m_use_unsafe_sync.adoc[`m_use_unsafe_sync`] 
| Whether to use unsafe synchronous settings for faster, less durable writes.
| xref:wallet/SQLiteDatabase/m_write_semaphore.adoc[`m_write_semaphore`] 
| Semaphore ensuring only one batch writes to the database at a time.
|===


== Non-Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:wallet/RunWithinTxn.adoc[`RunWithinTxn`]
| Executes the provided function 'func' within a database transaction context.
|===


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