sql_parser: insert statement AST

Author: Almaz-KG

README.md

@@ -80,15 +80,14 @@ The items were taken from the official SQLite documentation
 1. [update-stmt](https://www.sqlite.org/syntax/update-stmt.html) ✅
 1. [update-stmt-limited](https://www.sqlite.org/syntax/update-stmt-limited.html) ✅
 
-#### INSERT Statement ![progress](https://progress-bar.xyz/0/?scale=5&suffix=%%%20(0%20of%208)&width=140)
-1. insert-with-values
-1. insert-with-select
-1. insert-with-upsert
-1. insert-with-returning
-1. insert-with-default
-1. insert-with-cte
-1. replace-stmt
-1. common-table-expressions
+#### INSERT Statement ![progress](https://progress-bar.xyz/0/?scale=7&suffix=%%%20(0%20of%207)&width=140)
+1. [insert-with-values](https://www.sqlite.org/lang_insert.html)
+1. [insert-as-select](https://www.sqlite.org/lang_insert.html)
+1. [insert-with-upsert](https://www.sqlite.org/lang_insert.html)
+1. [insert-as-default](https://www.sqlite.org/lang_insert.html)
+1. [insert-with-returning](https://www.sqlite.org/lang_insert.html)
+1. [insert-with-cte](https://www.sqlite.org/lang_insert.html)
+1. [replace-stmt](https://www.sqlite.org/lang_replace.html)
 
 #### CREATE Statements ![progress](https://progress-bar.xyz/0/?scale=45&suffix=%%%20(0%20of%205)&width=140)
 1. create-virtual-table-stmt

src/ast/insert.rs

@@ -1,3 +1,67 @@
+use super::{
+    ConflictClause, Expression, Identifier, QualifiedTableName, ReturningClause, SelectStatement,
+    SetClause,
+};
+
 /// An AST for [INSERT](https://www.sqlite.org/lang_insert.html) SQL statement.
 #[derive(Debug, PartialEq)]
-pub struct InsertStatement {}
+pub struct InsertStatement {
+    pub conflict_clause: ConflictClause,
+
+    /// TODO: Change the type, as QualifiedTableName contains indexing type
+    /// which is not applicable for insert statements
+    pub table_name: QualifiedTableName,
+
+    pub columns: Vec<Identifier>,
+
+    pub values: InsertValues,
+
+    pub upsert_clause: Option<Vec<UpsertClause>>,
+
+    pub returning_clause: Vec<ReturningClause>,
+}
+
+/// The values to insert into the table.
+#[derive(Debug, PartialEq)]
+pub enum InsertValues {
+    /// The values to insert into the table.
+    Values(Vec<Expression>),
+
+    /// The values to insert into the table from a select statement.
+    Select(SelectStatement),
+
+    /// The values to insert into the table from a default value.
+    DefaultValues,
+}
+
+/// The upsert clause to update the table with the new values.
+#[derive(Debug, PartialEq)]
+pub struct UpsertClause {
+    pub conflict_target: Option<UpsertConflictTarget>,
+    pub action: UpsertAction,
+}
+
+/// The [conflict target](https://www.sqlite.org/lang_upsert.html#upsert_conflict_target)
+/// to update the table with the new values.
+#[derive(Debug, PartialEq)]
+pub struct UpsertConflictTarget {
+    pub columns: Vec<Identifier>,
+    pub where_clause: Option<Expression>,
+}
+
+/// The [action](https://www.sqlite.org/lang_upsert.html#upsert_action) to take when a conflict occurs.
+#[derive(Debug, PartialEq)]
+pub enum UpsertAction {
+    /// The action to take when a conflict occurs.
+    Nothing,
+
+    /// The action to take when a conflict occurs.
+    Update(UpsertUpdate),
+}
+
+/// The [update set](https://www.sqlite.org/lang_upsert.html) action to take when a conflict occurs.
+#[derive(Debug, PartialEq)]
+pub struct UpsertUpdate {
+    pub set_clauses: Vec<SetClause>,
+    pub where_clause: Option<Expression>,
+}