Package 'readwritesqlite' reference manual

Title:	Enhanced Reading and Writing for 'SQLite' Databases
Description:	Reads and writes data frames to 'SQLite' databases while preserving time zones (for POSIXct columns), projections (for 'sfc' columns), units (for 'units' columns), levels (for factors and ordered factors) and classes for logical, Date and 'hms' columns. It also logs changes to tables and provides more informative error messages.
Authors:	Joe Thorley [aut, cre] , Sebastian Dalgarno [ctb] , Poisson Consulting [cph, fnd]
Maintainer:	Joe Thorley <[email protected]>
License:	MIT + file LICENSE
Version:	0.2.0.9001
Built:	2024-11-01 16:19:52 UTC
Source:	https://github.com/poissonconsulting/readwritesqlite

Check SQLite Connection

Description

chk_sqlite_conn checks if a SQLite connection.

Usage

chk_sqlite_conn(x, connected = NA, x_name = NULL)

check_sqlite_connection(
  x,
  connected = NA,
  x_name = substitute(x),
  error = TRUE
)
chk_sqlite_conn(x, connected = NA, x_name = NULL)

check_sqlite_connection(
  x,
  connected = NA,
  x_name = substitute(x),
  error = TRUE
)

Arguments

`x`	The object to check.
`connected`	A logical scalar specifying whether x should be connected.
`x_name`	A string of the name of object x or NULL.
`error`	A flag specifying whether to through an error if the check fails.

Value

NULL, invisibly. Called for the side effect of throwing an error if the condition is not met.

Functions

check_sqlite_connection(): Check SQLite Connection

Examples

conn <- rws_connect()
chk_sqlite_conn(conn)
rws_disconnect(conn)
try(chk_sqlite_conn(conn, connected = TRUE))
conn <- rws_connect()
chk_sqlite_conn(conn)
rws_disconnect(conn)
try(chk_sqlite_conn(conn, connected = TRUE))

Opens SQLite Database Connection

Description

Opens a SQLiteConnection to a SQLite database with foreign key constraints enabled.

Usage

rws_connect(dbname = ":memory:", exists = NA)
rws_connect(dbname = ":memory:", exists = NA)

Arguments

dbname

The path to the database file. SQLite keeps each database instance in one single file. The name of the database is the file name, thus database names should be legal file names in the running platform. There are two exceptions:

"" will create a temporary on-disk database. The file will be deleted when the connection is closed.
":memory:" or "file::memory:" will create a temporary in-memory database.

exists

A flag specifying whether the table(s) must already exist.

Value

A SQLiteConnection to a SQLite database with foreign key constraints enabled.

Examples

conn <- rws_connect()
print(conn)
rws_disconnect(conn)
conn <- rws_connect()
print(conn)
rws_disconnect(conn)

Example Data

Description

An sf tibble of example data.

Usage

rws_data
rws_data

Format

An object of class tbl_df (inherits from tbl, data.frame) with 3 rows and 6 columns.

Examples

rws_data
rws_data

Add Descriptions to SQL Meta Data Table

Description

Add Descriptions to SQL Meta Data Table

Usage

rws_describe_meta(x, ..., conn)
rws_describe_meta(x, ..., conn)

Arguments

`x`	An object specifying the descriptions.
`...`	Not used.
`conn`	A SQLiteConnection to a database.

Value

An invisible copy of the updated meta table.

Add Descriptions to SQL Meta Data Table

Description

Add Descriptions to SQL Meta Data Table

Usage

## S3 method for class 'character'
rws_describe_meta(x, column, description, ..., conn)
## S3 method for class 'character'
rws_describe_meta(x, column, description, ..., conn)

Arguments

`x`	A character vector of table name(s).
`column`	A character vector of column name(s).
`description`	A character vector of the description(s)
`...`	Not used.
`conn`	A SQLiteConnection to a database.

Value

An invisible copy of the updated meta table.

Examples

conn <- rws_connect()
rws_write(rws_data, exists = FALSE, conn = conn)
rws_read_meta(conn)
rws_describe_meta("rws_data", "Units", "The site length.", conn = conn)
rws_describe_meta("rws_data", "POSIXct", "Time of the visit", conn = conn)
rws_read_meta(conn)
rws_disconnect(conn)
conn <- rws_connect()
rws_write(rws_data, exists = FALSE, conn = conn)
rws_read_meta(conn)
rws_describe_meta("rws_data", "Units", "The site length.", conn = conn)
rws_describe_meta("rws_data", "POSIXct", "Time of the visit", conn = conn)
rws_read_meta(conn)
rws_disconnect(conn)

Add Data Frame of Descriptions to SQL Meta Data Table

Description

Add Data Frame of Descriptions to SQL Meta Data Table

Usage

## S3 method for class 'data.frame'
rws_describe_meta(x, ..., conn)
## S3 method for class 'data.frame'
rws_describe_meta(x, ..., conn)

Arguments

`x`	A data frame with columns Table, Column, Description.
`...`	Not used.
`conn`	A SQLiteConnection to a database.

Value

An invisible character vector of the previous descriptions.

Close SQLite Database Connection

Description

Closes a SQLiteConnection to a SQLite database.

Usage

rws_disconnect(conn)
rws_disconnect(conn)

Arguments

conn

An RSQLite::SQLiteConnection().

Examples

conn <- rws_connect()
rws_disconnect(conn)
print(conn)
conn <- rws_connect()
rws_disconnect(conn)
print(conn)

Drop SQLite Table

Description

Drops SQLite table using DROP TABLE.

Usage

rws_drop_table(table_name, conn)
rws_drop_table(table_name, conn)

Arguments

`table_name`	A string of the name of the table.
`conn`	A SQLiteConnection to a database.

Details

Also drops rows from meta and init tables.

Value

TRUE

References

https://www.sqlite.org/lang_droptable.html

Examples

conn <- rws_connect()
rws_write(rws_data, exists = FALSE, conn = conn)
rws_list_tables(conn)
rws_drop_table("rws_data", conn = conn)
rws_list_tables(conn)
rws_disconnect(conn)
conn <- rws_connect()
rws_write(rws_data, exists = FALSE, conn = conn)
rws_list_tables(conn)
rws_drop_table("rws_data", conn = conn)
rws_list_tables(conn)
rws_disconnect(conn)

Export all spatial datasets in a database as geopackages.

Description

Export all spatial datasets in a database as geopackages.

Usage

rws_export_gpkg(conn, dir, overwrite = FALSE)
rws_export_gpkg(conn, dir, overwrite = FALSE)

Arguments

`conn`	A SQLiteConnection to a database.
`dir`	A string of the path to the directory to save the geopackages in.
`overwrite`	A flag specifying whether to overwrite existing geopackages.

Details

If more than one spatial column is present in a table, a separate geopackage will be exported for each, and the other spatial columns will be dropped.

Value

An invisible named vector of the file names and new file names saved.

Table Names

Description

Gets the table names excluding the names of the meta and log tables.

Usage

rws_list_tables(conn)
rws_list_tables(conn)

Arguments

conn

A SQLiteConnection to a database.

Value

A character vector of table names.

Examples

conn <- rws_connect()
rws_list_tables(conn)
rws_write(rws_data, exists = FALSE, conn = conn)
rws_list_tables(conn)
rws_disconnect(conn)
conn <- rws_connect()
rws_list_tables(conn)
rws_write(rws_data, exists = FALSE, conn = conn)
rws_list_tables(conn)
rws_disconnect(conn)

Query SQLite Database

Description

Gets a query from a SQLite database.

Usage

rws_query(query, meta = TRUE, conn)
rws_query(query, meta = TRUE, conn)

Arguments

`query`	A string of a SQLite query.
`meta`	A flag specifying whether to preserve meta data.
`conn`	A SQLiteConnection to a database.

Value

A data frame of the query.

Examples

conn <- rws_connect()
rws_write(rws_data, exists = FALSE, conn = conn)
rws_query("SELECT date, posixct, factor FROM rws_data", conn = conn)
rws_disconnect(conn)
conn <- rws_connect()
rws_write(rws_data, exists = FALSE, conn = conn)
rws_query("SELECT date, posixct, factor FROM rws_data", conn = conn)
rws_disconnect(conn)

Read from a SQLite Database

Description

Read from a SQLite Database

Usage

rws_read(x, ...)
rws_read(x, ...)

Arguments

`x`	An object specifying the table(s) to read.
`...`	Not used.

Value

A named list of data frames.

Read Initialization Data table from a SQLite Database

Description

The table is created if it doesn't exist.

Usage

rws_read_init(conn)
rws_read_init(conn)

Arguments

conn

A SQLiteConnection to a database.

Value

A data frame of the init table

Examples

conn <- rws_connect()
rws_read_init(conn)
rws_write(rws_data, exists = FALSE, conn = conn)
rws_read_init(conn)
rws_disconnect(conn)
conn <- rws_connect()
rws_read_init(conn)
rws_write(rws_data, exists = FALSE, conn = conn)
rws_read_init(conn)
rws_disconnect(conn)

Read Log Data Table from a SQLite Database

Description

The table is created if it doesn't exist.

Usage

rws_read_log(conn)
rws_read_log(conn)

Arguments

conn

A SQLiteConnection to a database.

Value

A data frame of the log table

Examples

conn <- rws_connect()
rws_read_log(conn)
rws_write(rws_data, exists = FALSE, conn = conn)
## Not run: 
rws_read_log(conn)

## End(Not run)
rws_disconnect(conn)
conn <- rws_connect()
rws_read_log(conn)
rws_write(rws_data, exists = FALSE, conn = conn)
## Not run: 
rws_read_log(conn)

## End(Not run)
rws_disconnect(conn)

Read Meta Data table from a SQLite Database

Description

The table is created if it doesn't exist.

Usage

rws_read_meta(conn)
rws_read_meta(conn)

Arguments

conn

A SQLiteConnection to a database.

Value

A data frame of the meta table

Examples

conn <- rws_connect()
rws_read_meta(conn)
rws_write(rws_data, exists = FALSE, conn = conn)
rws_read_meta(conn)
rws_disconnect(conn)
conn <- rws_connect()
rws_read_meta(conn)
rws_write(rws_data, exists = FALSE, conn = conn)
rws_read_meta(conn)
rws_disconnect(conn)

Read a Table from a SQLite Database

Description

Read a Table from a SQLite Database

Usage

rws_read_table(x, meta = TRUE, conn)
rws_read_table(x, meta = TRUE, conn)

Arguments

`x`	A string of the table name.
`meta`	A flag specifying whether to preserve meta data.
`conn`	A SQLiteConnection to a database.

Value

A data frame of the table.

Examples

conn <- rws_connect()
rws_write(rws_data, exists = FALSE, conn = conn)
rws_write(rws_data[c("date", "ordered")],
  x_name = "data2", exists = FALSE, conn = conn
)
rws_read_table("data2", conn = conn)
rws_disconnect(conn)
conn <- rws_connect()
rws_write(rws_data, exists = FALSE, conn = conn)
rws_write(rws_data[c("date", "ordered")],
  x_name = "data2", exists = FALSE, conn = conn
)
rws_read_table("data2", conn = conn)
rws_disconnect(conn)

Read Tables from a SQLite Database

Description

Read Tables from a SQLite Database

Usage

## S3 method for class 'character'
rws_read(x, meta = TRUE, conn, ...)
## S3 method for class 'character'
rws_read(x, meta = TRUE, conn, ...)

Arguments

`x`	A character vector of table names.
`meta`	A flag specifying whether to preserve meta data.
`conn`	A SQLiteConnection to a database.
`...`	Not used.

Value

A named list of the data frames.

Examples

conn <- rws_connect()
rws_write(rws_data, exists = FALSE, conn = conn)
rws_write(rws_data[c("date", "ordered")],
  x_name = "data2",
  exists = FALSE, conn = conn
)
rws_read(c("rws_data", "data2"), conn = conn)
rws_disconnect(conn)
conn <- rws_connect()
rws_write(rws_data, exists = FALSE, conn = conn)
rws_write(rws_data[c("date", "ordered")],
  x_name = "data2",
  exists = FALSE, conn = conn
)
rws_read(c("rws_data", "data2"), conn = conn)
rws_disconnect(conn)

Read All Tables from a SQLite Database

Description

Read All Tables from a SQLite Database

Usage

## S3 method for class 'SQLiteConnection'
rws_read(x, meta = TRUE, ...)
## S3 method for class 'SQLiteConnection'
rws_read(x, meta = TRUE, ...)

Arguments

`x`	A SQLiteConnection to a database.
`meta`	A flag specifying whether to preserve meta data.
`...`	Not used.

Value

A named list of the data frames.

Examples

conn <- rws_connect()
rws_write(rws_data, exists = FALSE, conn = conn)
rws_write(rws_data[c("date", "ordered")],
  x_name = "data2", exists = FALSE, conn = conn
)
rws_read(conn)
rws_disconnect(conn)
conn <- rws_connect()
rws_write(rws_data, exists = FALSE, conn = conn)
rws_write(rws_data[c("date", "ordered")],
  x_name = "data2", exists = FALSE, conn = conn
)
rws_read(conn)
rws_disconnect(conn)

Rename SQLite Column

Description

Rename SQLite Column

Usage

rws_rename_column(table_name, column_name, new_column_name, conn)
rws_rename_column(table_name, column_name, new_column_name, conn)

Arguments

`table_name`	A string of the name of the table.
`column_name`	A string of the column name.
`new_column_name`	A string of the new name for the column.
`conn`	A SQLiteConnection to a database.

Value

TRUE

Examples

conn <- rws_connect()
rws_write(data.frame(x = 1), x_name = "local", exists = FALSE, conn = conn)
rws_read_table("local", conn = conn)
rws_rename_column("local", "x", "Y", conn = conn)
rws_read_table("local", conn = conn)
rws_disconnect(conn)
conn <- rws_connect()
rws_write(data.frame(x = 1), x_name = "local", exists = FALSE, conn = conn)
rws_read_table("local", conn = conn)
rws_rename_column("local", "x", "Y", conn = conn)
rws_read_table("local", conn = conn)
rws_disconnect(conn)

Rename SQLite Table

Description

Rename SQLite Table

Usage

rws_rename_table(table_name, new_table_name, conn)
rws_rename_table(table_name, new_table_name, conn)

Arguments

`table_name`	A string of the name of the table.
`new_table_name`	A string of the new name for the table.
`conn`	A SQLiteConnection to a database.

Value

TRUE

Examples

conn <- rws_connect()
rws_write(rws_data, exists = FALSE, conn = conn)
rws_list_tables(conn)
rws_rename_table("rws_data", "tableb", conn)
rws_list_tables(conn)
rws_disconnect(conn)
conn <- rws_connect()
rws_write(rws_data, exists = FALSE, conn = conn)
rws_list_tables(conn)
rws_rename_table("rws_data", "tableb", conn)
rws_list_tables(conn)
rws_disconnect(conn)

Write to a SQLite Database

Description

Write to a SQLite Database

Usage

rws_write(
  x,
  exists = TRUE,
  delete = FALSE,
  replace = FALSE,
  meta = TRUE,
  log = TRUE,
  commit = TRUE,
  strict = TRUE,
  x_name = substitute(x),
  silent = getOption("rws.silent", FALSE),
  conn,
  ...
)
rws_write(
  x,
  exists = TRUE,
  delete = FALSE,
  replace = FALSE,
  meta = TRUE,
  log = TRUE,
  commit = TRUE,
  strict = TRUE,
  x_name = substitute(x),
  silent = getOption("rws.silent", FALSE),
  conn,
  ...
)

Arguments

`x`	The object to write.
`exists`	A flag specifying whether the table(s) must already exist.
`delete`	A flag specifying whether to delete existing rows before inserting data. If `meta = TRUE` the meta data is deleted.
`replace`	A flag specifying whether to replace any existing rows whose inclusion would violate unique or primary key constraints.
`meta`	A flag specifying whether to preserve meta data.
`log`	A flag specifying whether to log the table operations.
`commit`	A flag specifying whether to commit the operations (calling with commit = FALSE can be useful for checking data).
`strict`	A flag specifying whether to error if x has extraneous columns or if exists = TRUE extraneous data frames.
`x_name`	A string of the name of the object.
`silent`	A flag specifying whether to suppress messages and warnings.
`conn`	A SQLiteConnection to a database.
`...`	Not used.

Value

An invisible character vector of the name(s) of the table(s).

Examples

conn <- rws_connect()
rws_write(rws_data, exists = FALSE, conn = conn)
rws_disconnect(conn)
conn <- rws_connect()
rws_write(rws_data, exists = FALSE, conn = conn)
rws_disconnect(conn)

Write a Data Frame to a SQLite Database

Description

Write a Data Frame to a SQLite Database

Usage

## S3 method for class 'data.frame'
rws_write(
  x,
  exists = TRUE,
  delete = FALSE,
  replace = FALSE,
  meta = TRUE,
  log = TRUE,
  commit = TRUE,
  strict = TRUE,
  x_name = substitute(x),
  silent = getOption("rws.silent", FALSE),
  conn,
  ...
)
## S3 method for class 'data.frame'
rws_write(
  x,
  exists = TRUE,
  delete = FALSE,
  replace = FALSE,
  meta = TRUE,
  log = TRUE,
  commit = TRUE,
  strict = TRUE,
  x_name = substitute(x),
  silent = getOption("rws.silent", FALSE),
  conn,
  ...
)

Arguments

`x`	A data frame.
`exists`	A flag specifying whether the table(s) must already exist.
`delete`	A flag specifying whether to delete existing rows before inserting data. If `meta = TRUE` the meta data is deleted.
`replace`	A flag specifying whether to replace any existing rows whose inclusion would violate unique or primary key constraints.
`meta`	A flag specifying whether to preserve meta data.
`log`	A flag specifying whether to log the table operations.
`commit`	A flag specifying whether to commit the operations (calling with commit = FALSE can be useful for checking data).
`strict`	A flag specifying whether to error if x has extraneous columns or if exists = TRUE extraneous data frames.
`x_name`	A string of the name of the object.
`silent`	A flag specifying whether to suppress messages and warnings.
`conn`	A SQLiteConnection to a database.
`...`	Not used.

Examples

conn <- rws_connect()
rws_list_tables(conn)
rws_write(rws_data, exists = FALSE, conn = conn)
rws_write(rws_data, x_name = "moredata", exists = FALSE, conn = conn)
rws_list_tables(conn)
rws_disconnect(conn)
conn <- rws_connect()
rws_list_tables(conn)
rws_write(rws_data, exists = FALSE, conn = conn)
rws_write(rws_data, x_name = "moredata", exists = FALSE, conn = conn)
rws_list_tables(conn)
rws_disconnect(conn)

Write the Data Frames in an Environment to a SQLite Database

Description

Write the Data Frames in an Environment to a SQLite Database

Usage

## S3 method for class 'environment'
rws_write(
  x,
  exists = TRUE,
  delete = FALSE,
  replace = FALSE,
  meta = TRUE,
  log = TRUE,
  commit = TRUE,
  strict = TRUE,
  x_name = substitute(x),
  silent = getOption("rws.silent", FALSE),
  conn,
  all = TRUE,
  unique = TRUE,
  ...
)
## S3 method for class 'environment'
rws_write(
  x,
  exists = TRUE,
  delete = FALSE,
  replace = FALSE,
  meta = TRUE,
  log = TRUE,
  commit = TRUE,
  strict = TRUE,
  x_name = substitute(x),
  silent = getOption("rws.silent", FALSE),
  conn,
  all = TRUE,
  unique = TRUE,
  ...
)

Arguments

`x`	An environment.
`exists`	A flag specifying whether the table(s) must already exist.
`delete`	A flag specifying whether to delete existing rows before inserting data. If `meta = TRUE` the meta data is deleted.
`replace`	A flag specifying whether to replace any existing rows whose inclusion would violate unique or primary key constraints.
`meta`	A flag specifying whether to preserve meta data.
`log`	A flag specifying whether to log the table operations.
`commit`	A flag specifying whether to commit the operations (calling with commit = FALSE can be useful for checking data).
`strict`	A flag specifying whether to error if x has extraneous columns or if exists = TRUE extraneous data frames.
`x_name`	A string of the name of the object.
`silent`	A flag specifying whether to suppress messages and warnings.
`conn`	A SQLiteConnection to a database.
`all`	A flag specifying whether all the existing tables in the data base must be represented.
`unique`	A flag specifying whether each table must represented by no more than one data frame.
`...`	Not used.

Examples

conn <- rws_connect()
rws_list_tables(conn)
atable <- readwritesqlite::rws_data
another_table <- readwritesqlite::rws_data
not_atable <- 1L
rws_write(environment(), exists = FALSE, conn = conn)
rws_list_tables(conn)
rws_disconnect(conn)
conn <- rws_connect()
rws_list_tables(conn)
atable <- readwritesqlite::rws_data
another_table <- readwritesqlite::rws_data
not_atable <- 1L
rws_write(environment(), exists = FALSE, conn = conn)
rws_list_tables(conn)
rws_disconnect(conn)

Write a Named List of Data Frames to a SQLite Database

Description

Write a Named List of Data Frames to a SQLite Database

Usage

## S3 method for class 'list'
rws_write(
  x,
  exists = TRUE,
  delete = FALSE,
  replace = FALSE,
  meta = TRUE,
  log = TRUE,
  commit = TRUE,
  strict = TRUE,
  x_name = substitute(x),
  silent = getOption("rws.silent", FALSE),
  conn,
  all = TRUE,
  unique = TRUE,
  ...
)
## S3 method for class 'list'
rws_write(
  x,
  exists = TRUE,
  delete = FALSE,
  replace = FALSE,
  meta = TRUE,
  log = TRUE,
  commit = TRUE,
  strict = TRUE,
  x_name = substitute(x),
  silent = getOption("rws.silent", FALSE),
  conn,
  all = TRUE,
  unique = TRUE,
  ...
)

Arguments

`x`	A named list of data frames.
`exists`	A flag specifying whether the table(s) must already exist.
`delete`	A flag specifying whether to delete existing rows before inserting data. If `meta = TRUE` the meta data is deleted.
`replace`	A flag specifying whether to replace any existing rows whose inclusion would violate unique or primary key constraints.
`meta`	A flag specifying whether to preserve meta data.
`log`	A flag specifying whether to log the table operations.
`commit`	A flag specifying whether to commit the operations (calling with commit = FALSE can be useful for checking data).
`strict`	A flag specifying whether to error if x has extraneous columns or if exists = TRUE extraneous data frames.
`x_name`	A string of the name of the object.
`silent`	A flag specifying whether to suppress messages and warnings.
`conn`	A SQLiteConnection to a database.
`all`	A flag specifying whether all the existing tables in the data base must be represented.
`unique`	A flag specifying whether each table must represented by no more than one data frame.
`...`	Not used.

Examples

conn <- rws_connect()
rws_list_tables(conn)
rws_write(list(somedata = rws_data, anothertable = rws_data), exists = FALSE, conn = conn)
rws_list_tables(conn)
rws_disconnect(conn)
conn <- rws_connect()
rws_list_tables(conn)
rws_write(list(somedata = rws_data, anothertable = rws_data), exists = FALSE, conn = conn)
rws_list_tables(conn)
rws_disconnect(conn)

Validate SQLite Connection

Description

Validate SQLite Connection

Usage

vld_sqlite_conn(x, connected = NA)
vld_sqlite_conn(x, connected = NA)

Arguments

`x`	The object to check.
`connected`	A logical scalar specifying whether x should be connected.

Value

A flag indicating whether the object was validated.

Examples

conn <- rws_connect()
vld_sqlite_conn(conn)
rws_disconnect(conn)
vld_sqlite_conn(conn, connected = TRUE)
conn <- rws_connect()
vld_sqlite_conn(conn)
rws_disconnect(conn)
vld_sqlite_conn(conn, connected = TRUE)

Package 'readwritesqlite'

Help Index

Check SQLite Connection

Description

Usage

Arguments

Value

Functions

Examples

Opens SQLite Database Connection

Description

Usage

Arguments

Value

See Also

Examples

Example Data

Description

Usage

Format

Examples

Add Descriptions to SQL Meta Data Table

Description

Usage

Arguments

Value

See Also

Add Descriptions to SQL Meta Data Table

Description

Usage

Arguments

Value

See Also

Examples

Add Data Frame of Descriptions to SQL Meta Data Table

Description

Usage

Arguments

Value

See Also

Close SQLite Database Connection

Description

Usage

Arguments

See Also

Examples

Drop SQLite Table

Description

Usage

Arguments

Details

Value

References

See Also

Examples

Export all spatial datasets in a database as geopackages.

Description

Usage

Arguments

Details

Value

Table Names

Description

Usage

Arguments

Value

Examples

Query SQLite Database

Description

Usage

Arguments

Value

Examples

Read from a SQLite Database

Description

Usage

Arguments

Value

See Also

Read Initialization Data table from a SQLite Database