forked from extern/nushell
141 lines
4.7 KiB
Rust
141 lines
4.7 KiB
Rust
use crate::database::{SQLiteDatabase, MEMORY_DB};
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use nu_engine::CallExt;
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use nu_protocol::{
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ast::Call,
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engine::{Command, EngineState, Stack},
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Category, Example, IntoPipelineData, PipelineData, ShellError, Signature, Span, SyntaxShape,
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Type, Value,
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};
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#[derive(Clone)]
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pub struct StorDelete;
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impl Command for StorDelete {
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fn name(&self) -> &str {
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"stor delete"
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}
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fn signature(&self) -> Signature {
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Signature::build("stor delete")
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.input_output_types(vec![(Type::Nothing, Type::Table(vec![]))])
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.required_named(
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"table-name",
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SyntaxShape::String,
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"name of the table you want to insert into",
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Some('t'),
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)
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.named(
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"where-clause",
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SyntaxShape::String,
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"a sql string to use as a where clause without the WHERE keyword",
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Some('w'),
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)
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.allow_variants_without_examples(true)
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.category(Category::Database)
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}
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fn usage(&self) -> &str {
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"Delete a table or specified rows in the in-memory sqlite database."
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}
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fn search_terms(&self) -> Vec<&str> {
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vec!["sqlite", "remove", "table", "saving", "drop"]
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}
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fn examples(&self) -> Vec<Example> {
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vec![
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Example {
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description: "Delete a table from the in-memory sqlite database",
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example: "stor delete --table-name nudb",
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result: None,
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},
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Example {
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description:
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"Delete some rows from the in-memory sqlite database with a where clause",
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example: "stor delete --table-name nudb --where-clause \"int1 == 5\"",
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result: None,
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},
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]
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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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let span = call.head;
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// For dropping/deleting an entire table
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let table_name_opt: Option<String> = call.get_flag(engine_state, stack, "table-name")?;
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// For deleting rows from a table
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let where_clause_opt: Option<String> =
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call.get_flag(engine_state, stack, "where-clause")?;
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if table_name_opt.is_none() && where_clause_opt.is_none() {
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return Err(ShellError::MissingParameter {
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param_name: "requires at least one of table-name or where-clause".into(),
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span,
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});
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}
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if table_name_opt.is_none() && where_clause_opt.is_some() {
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return Err(ShellError::MissingParameter {
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param_name: "using the where-clause requires the use of a table-name".into(),
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span,
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});
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}
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// Open the in-mem database
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let db = Box::new(SQLiteDatabase::new(std::path::Path::new(MEMORY_DB), None));
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if let Some(new_table_name) = table_name_opt {
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let where_clause = match where_clause_opt {
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Some(where_stmt) => where_stmt,
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None => String::new(),
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};
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if let Ok(conn) = db.open_connection() {
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let sql_stmt = if where_clause.is_empty() {
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// We're deleting an entire table
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format!("DROP TABLE {}", new_table_name)
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} else {
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// We're just deleting some rows
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let mut delete_stmt = format!("DELETE FROM {} ", new_table_name);
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// Yup, this is a bit janky, but I'm not sure a better way to do this without having
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// --and and --or flags as well as supporting ==, !=, <>, is null, is not null, etc.
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// and other sql syntax. So, for now, just type a sql where clause as a string.
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delete_stmt.push_str(&format!("WHERE {}", where_clause));
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delete_stmt
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};
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// dbg!(&sql_stmt);
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conn.execute(&sql_stmt, [])
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.map_err(|err| ShellError::GenericError {
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error: "Failed to open SQLite connection in memory from delete".into(),
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msg: err.to_string(),
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span: Some(Span::test_data()),
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help: None,
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inner: vec![],
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})?;
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}
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}
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// dbg!(db.clone());
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Ok(Value::custom_value(db, span).into_pipeline_data())
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}
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}
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#[cfg(test)]
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mod test {
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use super::*;
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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(StorDelete {})
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}
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}
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