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use {
super::{columns_to_positions, validate},
crate::{
data::Schema,
executor::types::{ColumnInfo, Row as VecRow},
Column, ComplexTableName, ExecuteError, Glue, MetaRecipe, Payload, PlannedRecipe,
RecipeUtilities, Result, Row, Value,
},
sqlparser::ast::{Assignment, Expr, TableFactor, TableWithJoins},
};
impl Glue {
pub async fn update(
&mut self,
table: &TableWithJoins,
selection: &Option<Expr>,
assignments: &[Assignment],
) -> Result<Payload> {
let ComplexTableName {
name: table,
database,
..
} = match &table.relation {
TableFactor::Table { name, .. } => name.try_into(),
_ => Err(ExecuteError::QueryNotSupported.into()),
}?;
let Schema {
column_defs,
indexes,
..
} = self
.get_database(&database)?
.fetch_schema(&table)
.await?
.ok_or(ExecuteError::TableNotExists)?;
let columns = column_defs
.clone()
.into_iter()
.map(|Column { name, .. }| ColumnInfo::of_name(name))
.map(|mut col| {
col.table.name = table.clone();
col
})
.collect::<Vec<ColumnInfo>>();
let filter = selection
.clone()
.map(|selection| {
PlannedRecipe::new(
MetaRecipe::new(selection)?.simplify_by_context(&*self.get_context()?)?,
&columns,
)
})
.unwrap_or(Ok(PlannedRecipe::TRUE))?;
let assignments = assignments
.iter()
.map(|assignment| {
let Assignment { id, value } = assignment;
let column_compare = id
.clone()
.into_iter()
.map(|component| component.value)
.collect();
let index = columns
.iter()
.position(|column| column == &column_compare)
.ok_or(ExecuteError::ColumnNotFound)?;
let recipe = PlannedRecipe::new(
MetaRecipe::new(value.clone())?.simplify_by_context(&*self.get_context()?)?,
&columns,
)?;
Ok((index, recipe))
})
.collect::<Result<Vec<(usize, PlannedRecipe)>>>()?;
let keyed_rows = self
.get_database(&None)?
.scan_data(&table)
.await?
.into_iter()
.filter_map(|(key, Row(row))| match filter.confirm_constraint(&row) {
Ok(false) => None,
Err(error) => Some(Err(error)),
Ok(true) => Some(
row.iter()
.enumerate()
.map(|(index, old_value)| {
assignments
.iter()
.find_map(|(assignment_index, assignment_recipe)| {
if assignment_index == &index {
Some(
assignment_recipe
.clone()
.simplify_by_row(&row)
.and_then(|recipe| recipe.confirm()),
)
} else {
None
}
})
.unwrap_or(Ok(old_value.clone()))
})
.collect::<Result<VecRow>>()
.map(|row| (key, row)),
),
})
.collect::<Result<Vec<(Value, VecRow)>>>()?;
let column_positions = columns_to_positions(&column_defs, &[])?;
let (keys, mut rows): (Vec<Value>, Vec<VecRow>) = keyed_rows.into_iter().unzip();
validate(&column_defs, &column_positions, &mut rows)?;
let table = table.as_str();
let mut rows: Vec<Row> = rows.into_iter().map(Row).collect();
#[cfg(feature = "auto-increment")]
self.auto_increment(&database, table, &column_defs, &mut rows)
.await?;
let keyed_rows: Vec<(Value, Row)> = keys.into_iter().zip(rows).collect();
let num_rows = keyed_rows.len();
let database = &mut **self.get_mut_database(&database)?;
let result = database
.update_data(table, keyed_rows)
.await
.map(|_| Payload::Update(num_rows))?;
for index in indexes.iter() {
index.reset(database, table, &column_defs).await?;
}
Ok(result)
}
}
