File adapter for Sqlite files. More...

#include <OpenMS/FORMAT/SqliteConnector.h>

Collaboration diagram for SqliteConnector:

Public Types
enum class	SqlOpenMode { READ_ONLY , READONLY = READ_ONLY , READWRITE , READWRITE_OR_CREATE }
	how an sqlite db should be opened More...

Public Member Functions
	SqliteConnector ()=delete
	Default constructor.

	SqliteConnector (const std::string &filename, const SqlOpenMode mode=SqlOpenMode::READWRITE_OR_CREATE)

	~SqliteConnector ()
	Destructor.

sqlite3 *	getDB ()
	Returns the raw pointer to the database.

bool	tableExists (const std::string &tablename)
	Checks whether the given table exists.

Size	countTableRows (const std::string &table_name)

bool	columnExists (const std::string &tablename, const std::string &colname)
	Checks whether the given table contains a certain column.

void	executeStatement (const std::string &statement)
	Executes a given SQL statement (insert statement)

void	executeBindStatement (const std::string &prepare_statement, const std::vector< std::string > &data)
	Executes raw data SQL statements (insert statements)

void	prepareStatement (sqlite3_stmt **stmt, const std::string &prepare_statement)
	Prepares a SQL statement.

Static Public Member Functions
static bool	tableExists (sqlite3 *db, const std::string &tablename)
	Checks whether the given table exists.

static bool	columnExists (sqlite3 *db, const std::string &tablename, const std::string &colname)
	Checks whether the given table contains a certain column.

static void	executeStatement (sqlite3 *db, const std::stringstream &statement)
	Executes a given SQL statement (insert statement)

static void	executeStatement (sqlite3 *db, const std::string &statement)
	Executes a given SQL statement (insert statement)

static void	prepareStatement (sqlite3 db, sqlite3_stmt *stmt, const std::string &prepare_statement)
	Converts an SQL statement into a prepared statement.

static void	executeBindStatement (sqlite3 *db, const std::string &prepare_statement, const std::vector< std::string > &data)
	Executes raw data SQL statements (insert statements)

Protected Member Functions
void	openDatabase_ (const std::string &filename, const SqlOpenMode mode)
	Opens a new SQLite database.

Protected Attributes
sqlite3 *	db_ = nullptr

Detailed Description

File adapter for Sqlite files.

This class contains certain helper functions to deal with Sqlite files.

Member Enumeration Documentation

◆ SqlOpenMode

enum class SqlOpenMode

strong

how an sqlite db should be opened

Enumerator
READ_ONLY	the DB must exist and is read-only
READONLY	compatibility alias for READ_ONLY
READWRITE	the DB is readable and writable, but must exist when opening it
READWRITE_OR_CREATE	the DB readable and writable and is created new if not present already

Constructor & Destructor Documentation

◆ SqliteConnector() [1/2]

SqliteConnector ( )

delete

Default constructor.

◆ SqliteConnector() [2/2]

SqliteConnector	(	const std::string &	filename,
		const SqlOpenMode	mode = `SqlOpenMode::READWRITE_OR_CREATE`
	)

explicit

Constructor which opens a connection to filename

Exceptions

Exception::SqlOperationFailed if the file does not exist/cannot be created (depending on mode)

◆ ~SqliteConnector()

~SqliteConnector ( )

Destructor.

Member Function Documentation

◆ columnExists() [1/2]

bool columnExists	(	const std::string &	tablename,
		const std::string &	colname
	)

inline

Checks whether the given table contains a certain column.

tablename The name of the table (needs to exist) colname The name of the column to be checked

Returns: Whether the column exists or not

◆ columnExists() [2/2]

static bool columnExists	(	sqlite3 *	db,
		const std::string &	tablename,
		const std::string &	colname
	)

static

Checks whether the given table contains a certain column.

db The sqlite database (needs to be open) tablename The name of the table (needs to exist) colname The name of the column to be checked

Returns: Whether the column exists or not

◆ countTableRows()

Size countTableRows ( const std::string & table_name )

Counts the number of entries in SQL table table_name

Exceptions

Exception::SqlOperationFailed if table is unknown

◆ executeBindStatement() [1/2]

void executeBindStatement	(	const std::string &	prepare_statement,
		const std::vector< std::string > &	data
	)

inline

Executes raw data SQL statements (insert statements)

This is useful for a case where raw data should be inserted into sqlite databases, and the raw data needs to be passed separately as it cannot be part of a true SQL statement

INSERT INTO TBL (ID, DATA) VALUES (100, ?1), (101, ?2), (102, ?3)"

statement The SQL statement data The data to bind

Exceptions

Exception::IllegalArgument is thrown if the SQL command fails.

◆ executeBindStatement() [2/2]

static void executeBindStatement	(	sqlite3 *	db,
		const std::string &	prepare_statement,
		const std::vector< std::string > &	data
	)

static

Executes raw data SQL statements (insert statements)

This is useful for a case where raw data should be inserted into sqlite databases, and the raw data needs to be passed separately as it cannot be part of a true SQL statement

INSERT INTO TBL (ID, DATA) VALUES (100, ?1), (101, ?2), (102, ?3)"

db The sqlite database (needs to be open) statement The SQL statement data The data to bind

Exceptions

Exception::IllegalArgument is thrown if the SQL command fails.

◆ executeStatement() [1/3]

void executeStatement ( const std::string & statement )

inline

Executes a given SQL statement (insert statement)

This is useful for writing a single row of data

statement The SQL statement

Exceptions

Exception::IllegalArgument is thrown if the SQL command fails.

◆ executeStatement() [2/3]

static void executeStatement	(	sqlite3 *	db,
		const std::string &	statement
	)

static

Executes a given SQL statement (insert statement)

This is useful for writing a single row of data. It wraps sqlite3_exec with proper error handling.

db The sqlite database (needs to be open) statement The SQL statement

Exceptions

Exception::IllegalArgument is thrown if the SQL command fails.

◆ executeStatement() [3/3]

static void executeStatement	(	sqlite3 *	db,
		const std::stringstream &	statement
	)

static

Executes a given SQL statement (insert statement)

This is useful for writing a single row of data. It wraps sqlite3_exec with proper error handling.

db The sqlite database (needs to be open) statement The SQL statement

Exceptions

Exception::IllegalArgument is thrown if the SQL command fails.

◆ getDB()

sqlite3 * getDB ( )

inline

Returns the raw pointer to the database.

Note: The pointer is tied to the lifetime of the SqliteConnector object, do not use it after the object has gone out of scope!

Returns: SQLite database ptr

◆ openDatabase_()

void openDatabase_	(	const std::string &	filename,
		const SqlOpenMode	mode
	)

protected

Opens a new SQLite database.

Parameters

[in]	filename	Filename of the database
[in]	mode	See SqlOpenMode

Note: Call this only once!

◆ prepareStatement() [1/2]

static void prepareStatement	(	sqlite3 *	db,
		sqlite3_stmt **	stmt,
		const std::string &	prepare_statement
	)

static

Converts an SQL statement into a prepared statement.

This routine converts SQL text into a prepared statement object and returns a pointer to that object. This interface requires a database connection created by a prior call to sqlite3_open() and a text string containing the SQL statement to be prepared. This API does not actually evaluate the SQL statement. It merely prepares the SQL statement for evaluation.

This is useful for handling errors in a consistent manner. Internally calls sqlite3_prepare_v2.

db The sqlite database (needs to be open) stmt The prepared statement (output) prepare_statement The SQL statement to prepare (input)

Exceptions

Exception::IllegalArgument is thrown if the SQL command fails.

◆ prepareStatement() [2/2]

void prepareStatement	(	sqlite3_stmt **	stmt,
		const std::string &	prepare_statement
	)

inline

Prepares a SQL statement.

This is useful for handling errors in a consistent manner.

db The sqlite database (needs to be open) statement The SQL statement data The data to bind

Exceptions

Exception::IllegalArgument is thrown if the SQL command fails.

◆ tableExists() [1/2]

bool tableExists ( const std::string & tablename )

inline

Checks whether the given table exists.

tablename The name of the table to be checked

Returns: Whether the table exists or not

◆ tableExists() [2/2]

static bool tableExists	(	sqlite3 *	db,
		const std::string &	tablename
	)

static

Checks whether the given table exists.

db The sqlite database (needs to be open) tablename The name of the table to be checked

Returns: Whether the table exists or not

Member Data Documentation

◆ db_

sqlite3* db_ = nullptr

protected

Public Types

Public Member Functions

Static Public Member Functions

Protected Member Functions

Protected Attributes

Detailed Description

Member Enumeration Documentation

◆ SqlOpenMode

Constructor & Destructor Documentation

◆ SqliteConnector() [1/2]

◆ SqliteConnector() [2/2]

◆ ~SqliteConnector()

Member Function Documentation

◆ columnExists() [1/2]

◆ columnExists() [2/2]

◆ countTableRows()

◆ executeBindStatement() [1/2]

◆ executeBindStatement() [2/2]

◆ executeStatement() [1/3]

◆ executeStatement() [2/3]

◆ executeStatement() [3/3]

◆ getDB()

◆ openDatabase_()

◆ prepareStatement() [1/2]

◆ prepareStatement() [2/2]

◆ tableExists() [1/2]

◆ tableExists() [2/2]

Member Data Documentation

◆ db_