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use {
super::types::get_first_name,
crate::{parse_sql::Query, Glue, Result, Row},
serde::Serialize,
sqlparser::ast::{ObjectType, Statement},
thiserror::Error as ThisError,
};
#[derive(ThisError, Serialize, Debug, PartialEq)]
pub enum ExecuteError {
#[error("query not supported")]
QueryNotSupported,
#[error("SET does not currently support columns, aggregates or subqueries")]
MissingComponentsForSet,
#[error("unsupported insert value type: {0}")]
UnreachableUnsupportedInsertValueType(String),
#[error("object not recognised")]
ObjectNotRecognised,
#[error("unimplemented")]
Unimplemented,
#[error("database already exists")]
DatabaseExists(String),
#[error("invalid file location")]
InvalidFileLocation,
#[error("invalid database location")]
InvalidDatabaseLocation,
#[error("table does not exist")]
TableNotExists,
#[error("column could not be found")]
ColumnNotFound,
}
#[derive(Serialize, Debug, PartialEq)]
pub enum Payload {
Success,
Create,
Insert(usize),
Select {
labels: Vec<String>,
rows: Vec<Row>,
},
Delete(usize),
Update(usize),
DropTable,
#[cfg(feature = "alter-table")]
AlterTable,
TruncateTable,
}
impl Glue {
pub async fn execute_query(&mut self, statement: &Query) -> Result<Payload> {
let Query(statement) = statement;
match statement {
Statement::CreateDatabase {
db_name,
if_not_exists,
location,
..
} => {
if !self.try_extend_from_path(
db_name.0[0].value.clone(),
location
.clone()
.ok_or(ExecuteError::InvalidDatabaseLocation)?,
)? && !if_not_exists
{
Err(ExecuteError::DatabaseExists(db_name.0[0].value.clone()).into())
} else {
Ok(Payload::Success)
}
}
Statement::CreateTable {
name,
columns,
if_not_exists,
..
} => self
.create_table(name, columns, *if_not_exists)
.await
.map(|_| Payload::Create),
Statement::CreateView {
name,
query,
or_replace,
..
} => self
.create_view(name, query, *or_replace)
.await
.map(|_| Payload::Create),
Statement::Drop {
object_type,
names,
if_exists,
..
} => match object_type {
ObjectType::Schema => {
if !self.reduce(&get_first_name(names)?) && !if_exists {
Err(ExecuteError::ObjectNotRecognised.into())
} else {
Ok(Payload::Success)
}
}
object_type => self
.drop(object_type, names, *if_exists)
.await
.map(|_| Payload::DropTable),
},
#[cfg(feature = "alter-table")]
Statement::AlterTable { name, operation } => self
.alter_table(name, operation)
.await
.map(|_| Payload::AlterTable),
Statement::Truncate { table_name, .. } => self
.truncate(table_name)
.await
.map(|_| Payload::TruncateTable),
Statement::CreateIndex {
name,
table_name,
columns,
unique,
if_not_exists,
} => self
.create_index(table_name, name, columns, *unique, *if_not_exists)
.await
.map(|_| Payload::Create),
Statement::Insert {
table_name,
columns,
source,
..
} => self.insert(table_name, columns, source, false).await,
Statement::Update {
table,
selection,
assignments,
from: _,
} => self.update(table, selection, assignments).await,
Statement::Delete {
table_name,
selection,
} => self.delete(table_name, selection).await,
Statement::Query(query_value) => {
let result = self.query(*query_value.clone()).await?;
let (labels, rows) = result;
let rows = rows.into_iter().map(Row).collect();
let payload = Payload::Select { labels, rows };
Ok(payload)
}
Statement::SetVariable {
variable, value, ..
} => self
.set_variable(variable, value)
.await
.map(|_| Payload::Success),
Statement::ExplainTable { table_name, .. } => self.explain(table_name).await,
Statement::Execute { name, parameters } => self.procedure(name, parameters).await,
_ => Err(ExecuteError::QueryNotSupported.into()),
}
}
}
