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https://github.com/nushell/nushell.git
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new command into sqlite allows you to take lists and create a sqlite db (#6266)
This commit is contained in:
Darren Schroeder
GitHub
parent
9f131d998d
commit
9adcecbbf1
334
crates/nu-command/src/database/commands/into_sqlite.rs
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334
crates/nu-command/src/database/commands/into_sqlite.rs
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@ -0,0 +1,334 @@
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use crate::database::values::sqlite::open_sqlite_db;
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use itertools::Itertools;
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use nu_engine::CallExt;
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use nu_protocol::ast::Call;
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use nu_protocol::engine::{Command, EngineState, Stack};
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use nu_protocol::{
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Category, Config, Example, IntoPipelineData, PipelineData, ShellError, Signature, Span,
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Spanned, SyntaxShape, Type, Value,
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};
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use std::iter;
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use std::path::Path;
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#[derive(Clone)]
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pub struct IntoSqliteDb;
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impl Command for IntoSqliteDb {
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fn name(&self) -> &str {
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"into sqlite"
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}
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fn signature(&self) -> Signature {
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Signature::build("into sqlite")
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.required(
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"file_name",
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SyntaxShape::String,
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"Specify the filename to save the database to",
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)
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.named(
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"table_name",
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SyntaxShape::String,
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"Specify table name to store the data in",
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Some('t'),
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)
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.category(Category::Conversions)
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}
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fn run(
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&self,
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engine_state: &EngineState,
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stack: &mut Stack,
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call: &Call,
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input: PipelineData,
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) -> Result<PipelineData, ShellError> {
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operate(engine_state, stack, call, input)
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}
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fn usage(&self) -> &str {
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"Convert table into a sqlite database"
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}
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fn search_terms(&self) -> Vec<&str> {
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vec!["convert", "sqlite", "database"]
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}
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fn examples(&self) -> Vec<Example> {
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vec![Example {
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description: "Convert ls entries into a sqlite database with 'main' as the table name",
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example: "ls | into sqlite my_ls.db",
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result: None,
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},
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Example {
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description: "Convert ls entries into a sqlite database with 'my_table' as the table name",
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example: "ls | into sqlite my_ls.db -t my_table",
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result: None,
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},
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Example {
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description: "Convert table literal into a sqlite database with 'main' as the table name",
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example: "[[name]; [-----] [someone] [=====] [somename] ['(((((']] | into sqlite filename.db",
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result: None,
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},
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Example {
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description: "Convert a variety of values in table literal form into a sqlite database",
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example: "[one 2 5.2 six true 100mib 25sec] | into sqlite variety.db",
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result: None,
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}]
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}
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}
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fn operate(
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engine_state: &EngineState,
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stack: &mut Stack,
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call: &Call,
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input: PipelineData,
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) -> Result<PipelineData, ShellError> {
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let span = call.head;
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let config = engine_state.get_config();
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let file_name: Spanned<String> = call.req(engine_state, stack, 0)?;
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let table_name: Option<Spanned<String>> = call.get_flag(engine_state, stack, "table_name")?;
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// collect the input into a value
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let table_entries = input.into_value(span);
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match action(&table_entries, table_name, file_name, config, span) {
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Ok(val) => Ok(val.into_pipeline_data()),
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Err(e) => Err(e),
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}
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}
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fn action(
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input: &Value,
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table: Option<Spanned<String>>,
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file: Spanned<String>,
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config: &Config,
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span: Span,
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) -> Result<Value, ShellError> {
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let table_name = if let Some(table_name) = table {
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table_name.item
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} else {
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"main".to_string()
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};
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match input {
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Value::List { vals, span } => {
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// find the column names, and sqlite data types
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let columns = get_columns_with_sqlite_types(vals);
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let table_columns_creation = columns
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.iter()
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.map(|(name, sql_type)| format!("{} {}", name, sql_type))
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.join(",");
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// get the values
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let table_values = vals
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.iter()
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.map(|list_value| {
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format!(
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"({})",
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match list_value {
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Value::Record {
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cols: _,
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vals,
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span: _,
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} => {
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vals.iter()
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.map(|rec_val| {
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format!(
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"'{}'",
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nu_value_to_string(rec_val.clone(), "", config)
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)
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})
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.join(",")
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}
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// Number is formats so keep them without quotes
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Value::Int { val: _, span: _ }
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| Value::Float { val: _, span: _ }
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| Value::Filesize { val: _, span: _ }
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| Value::Duration { val: _, span: _ } =>
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nu_value_to_string(list_value.clone(), "", config),
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_ =>
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// String formats so add quotes around them
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format!("'{}'", nu_value_to_string(list_value.clone(), "", config)),
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}
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)
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})
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.join(",");
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// create the sqlite database table
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let conn = open_sqlite_db(Path::new(&file.item), file.span)?;
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// create a string for sql table creation
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let create_statement = format!(
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"CREATE TABLE IF NOT EXISTS {} ({})",
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table_name, table_columns_creation
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);
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// prepare the string as a sqlite statement
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let mut stmt = conn.prepare(&create_statement).map_err(|e| {
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ShellError::GenericError(
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"Failed to prepare SQLite statement".into(),
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e.to_string(),
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Some(file.span),
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None,
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Vec::new(),
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)
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})?;
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// execute the statement
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stmt.execute([]).map_err(|e| {
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ShellError::GenericError(
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"Failed to execute SQLite statement".into(),
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e.to_string(),
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Some(file.span),
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None,
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Vec::new(),
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)
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})?;
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// use normal sql to create the table
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// insert into table_name
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// values
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// ('xx', 'yy', 'zz'),
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// ('aa', 'bb', 'cc'),
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// ('dd', 'ee', 'ff')
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// create the string for inserting data into the table
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let insert_statement = format!("INSERT INTO {} VALUES {}", table_name, table_values);
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// prepare the string as a sqlite statement
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let mut stmt = conn.prepare(&insert_statement).map_err(|e| {
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ShellError::GenericError(
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"Failed to prepare SQLite statement".into(),
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e.to_string(),
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Some(file.span),
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None,
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Vec::new(),
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)
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})?;
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// execute the statement
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stmt.execute([]).map_err(|e| {
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ShellError::GenericError(
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"Failed to execute SQLite statement".into(),
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e.to_string(),
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Some(file.span),
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None,
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Vec::new(),
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)
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})?;
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// and we're done
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Ok(Value::Nothing { span: *span })
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}
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_ => Err(ShellError::UnsupportedInput(
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format!(
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"Expected a list but instead received a {}",
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input.get_type()
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),
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span,
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)),
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}
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}
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// This is taken from to text local_into_string but tweaks it a bit so that certain formatting does not happen
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fn nu_value_to_string(value: Value, separator: &str, config: &Config) -> String {
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match value {
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Value::Bool { val, .. } => val.to_string(),
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Value::Int { val, .. } => val.to_string(),
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Value::Float { val, .. } => val.to_string(),
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Value::Filesize { val, .. } => val.to_string(),
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Value::Duration { val, .. } => val.to_string(),
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Value::Date { val, .. } => val.to_string(),
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Value::Range { val, .. } => {
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format!(
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"{}..{}",
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nu_value_to_string(val.from, ", ", config),
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nu_value_to_string(val.to, ", ", config)
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)
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}
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Value::String { val, .. } => val,
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Value::List { vals: val, .. } => val
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.iter()
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.map(|x| nu_value_to_string(x.clone(), ", ", config))
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.collect::<Vec<_>>()
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.join(separator),
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Value::Record { cols, vals, .. } => cols
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.iter()
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.zip(vals.iter())
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.map(|(x, y)| format!("{}: {}", x, nu_value_to_string(y.clone(), ", ", config)))
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.collect::<Vec<_>>()
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.join(separator),
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Value::Block { val, .. } => format!("<Block {}>", val),
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Value::Nothing { .. } => String::new(),
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Value::Error { error } => format!("{:?}", error),
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Value::Binary { val, .. } => format!("{:?}", val),
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Value::CellPath { val, .. } => val.into_string(),
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Value::CustomValue { val, .. } => val.value_string(),
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}
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}
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// Each value stored in an SQLite database (or manipulated by the database engine) has one of the following storage classes:
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// NULL. The value is a NULL value.
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// INTEGER. The value is a signed integer, stored in 0, 1, 2, 3, 4, 6, or 8 bytes depending on the magnitude of the value.
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// REAL. The value is a floating point value, stored as an 8-byte IEEE floating point number.
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// TEXT. The value is a text string, stored using the database encoding (UTF-8, UTF-16BE or UTF-16LE).
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// BLOB. The value is a blob of data, stored exactly as it was input.
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fn nu_type_to_sqlite_type(nu_type: Type) -> &'static str {
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match nu_type {
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Type::Int => "INTEGER",
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Type::Float => "REAL",
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Type::String => "TEXT",
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Type::Bool => "TEXT",
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Type::Nothing => "NULL",
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Type::Filesize => "INTEGER",
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Type::Date => "TEXT",
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_ => "TEXT",
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}
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}
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fn get_columns_with_sqlite_types(input: &[Value]) -> Vec<(String, String)> {
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let mut columns: Vec<(String, String)> = vec![];
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let mut added = false;
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for item in input {
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// let sqlite_type = nu_type_to_sqlite_type(item.get_type());
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// eprintln!(
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// "item_type: {:?}, sqlite_type: {:?}",
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// item.get_type(),
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// sqlite_type
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// );
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if let Value::Record { cols, vals, .. } = item {
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for (c, v) in iter::zip(cols, vals) {
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if !columns.iter().any(|(name, _)| name == c) {
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columns.push((
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c.to_string(),
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nu_type_to_sqlite_type(v.get_type()).to_string(),
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));
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}
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}
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} else {
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// force every other type to a string
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if !added {
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columns.push(("value".to_string(), "TEXT".to_string()));
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added = true;
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}
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}
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}
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columns
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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// use super::{action, IntoSqliteDb};
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// use nu_protocol::Type::Error;
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#[test]
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fn test_examples() {
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use crate::test_examples;
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test_examples(IntoSqliteDb {})
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}
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}
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@ -7,6 +7,7 @@ mod collect;
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mod describe;
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mod from;
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mod group_by;
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mod into_sqlite;
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mod join;
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mod limit;
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mod open;
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@ -22,16 +23,16 @@ mod where_;
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mod testing;
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use testing::TestingDb;
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use nu_protocol::engine::StateWorkingSet;
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use alias::AliasDb;
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use and::AndDb;
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use collect::CollectDb;
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pub(crate) use describe::DescribeDb;
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pub(crate) use from::FromDb;
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use group_by::GroupByDb;
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use into_sqlite::IntoSqliteDb;
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use join::JoinDb;
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use limit::LimitDb;
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use nu_protocol::engine::StateWorkingSet;
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use open::OpenDb;
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use or::OrDb;
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use order_by::OrderByDb;
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@ -60,6 +61,7 @@ pub fn add_commands_decls(working_set: &mut StateWorkingSet) {
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DescribeDb,
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FromDb,
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GroupByDb,
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IntoSqliteDb,
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JoinDb,
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LimitDb,
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OpenDb,
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@ -415,7 +415,7 @@ impl CustomValue for SQLiteDatabase {
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}
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}
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fn open_sqlite_db(path: &Path, call_span: Span) -> Result<Connection, nu_protocol::ShellError> {
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pub fn open_sqlite_db(path: &Path, call_span: Span) -> Result<Connection, nu_protocol::ShellError> {
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let path = path.to_string_lossy().to_string();
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Connection::open(path).map_err(|e| {
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