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use super::schema;
pub type Error = String;
pub enum SqlStatement {
Statement(Statement),
ExplainQueryPlan(Statement),
Attach(AttachStatement),
Describe(DescribeStatement),
}
impl SqlStatement {
pub fn resolve_names(self, database: &schema::Database) -> Result<SqlStatement, Error> {
match self {
SqlStatement::Statement(statement) => Ok(SqlStatement::Statement(
statement.resolve_names(&database)?,
)),
SqlStatement::ExplainQueryPlan(statement) => Ok(SqlStatement::ExplainQueryPlan(
statement.resolve_names(&database)?,
)),
SqlStatement::Attach(statement) => Ok(SqlStatement::Attach(statement)),
SqlStatement::Describe(statement) => Ok(SqlStatement::Describe(statement)),
}
}
}
pub enum Statement {
Select(SelectStatement),
Insert(InsertStatement),
Delete(DeleteStatement),
Update(UpdateStatement),
}
impl Statement {
fn resolve_names(&self, database: &schema::Database) -> Result<Statement, Error> {
match self {
&Statement::Select(ref select) => Ok(
Statement::Select(select.resolve_names(&database)?),
),
&Statement::Insert(ref insert) => Ok(
Statement::Insert(insert.resolve_names(&database)?),
),
&Statement::Delete(ref delete) => Ok(
Statement::Delete(delete.resolve_names(&database)?),
),
&Statement::Update(ref update) => Ok(
Statement::Update(update.resolve_names(&database)?),
),
}
}
}
pub struct InsertStatement {
pub table_name: Vec<String>,
pub columns: Option<Vec<String>>,
pub source: Box<SetExpression>,
}
impl InsertStatement {
fn resolve_names(&self, database: &schema::Database) -> Result<InsertStatement, Error> {
Err(String::from("Not implemented"))
}
}
pub struct CommonTableExpression {
pub identifier: String,
pub column_names: Option<Vec<String>>,
pub query: SelectStatement,
}
pub struct SelectStatement {
pub common: Vec<CommonTableExpression>,
pub expr: Box<SetExpression>,
pub order_by: Vec<Ordering>,
pub limit: Option<Limit>,
}
impl SelectStatement {
fn resolve_names(&self, database: &schema::Database) -> Result<SelectStatement, Error> {
Err(String::from("Not implemented"))
}
}
pub struct DeleteStatement {
pub table_name: Vec<String>,
pub where_expr: Option<Box<Expression>>,
}
impl DeleteStatement {
fn resolve_names(&self, database: &schema::Database) -> Result<DeleteStatement, Error> {
Err(String::from("Not implemented"))
}
}
pub struct UpdateStatement {
pub table_name: Vec<String>,
pub assignments: Vec<Assignment>,
pub where_expr: Option<Box<Expression>>,
}
impl UpdateStatement {
fn resolve_names(&self, database: &schema::Database) -> Result<UpdateStatement, Error> {
Err(String::from("Not implemented"))
}
}
pub struct AttachStatement {
pub schema: Option<String>,
pub name: String,
pub path: String,
}
impl AttachStatement {
pub fn new(schema: Option<String>, name: String, path: String) -> AttachStatement {
AttachStatement { schema, name, path }
}
}
pub struct DescribeStatement {
pub schema: Option<String>,
pub name: String,
}
impl DescribeStatement {
pub fn new(schema: Option<String>, name: String) -> DescribeStatement {
DescribeStatement { schema, name }
}
}
pub struct Assignment {
pub columns: Vec<String>,
pub expr: Box<Expression>,
}
pub enum SelectMode {
All,
Distinct,
}
pub enum SetExpression {
Values(Vec<Vec<Box<Expression>>>),
Query {
mode: SelectMode,
columns: ResultColumns,
from: Vec<Box<TableExpression>>,
where_expr: Option<Box<Expression>>,
group_by: Option<GroupBy>,
},
Op {
op: SetOperator,
left: Box<SetExpression>,
right: Box<SetExpression>,
},
}
pub enum TableExpression {
Named {
name: Vec<String>,
alias: Option<String>,
},
Select {
select: SelectStatement,
alias: Option<String>,
},
Join {
left: Box<TableExpression>,
right: Box<TableExpression>,
op: JoinOperator,
constraint: JoinConstraint,
},
}
pub enum JoinConstraint {
Expr(Box<Expression>),
Columns(Vec<String>),
}
pub enum JoinOperator {
Join(JoinType),
Natural(JoinType),
Cross,
}
pub enum JoinType {
Inner,
Left,
Right,
Full,
}
pub enum ResultColumns {
All,
List(Vec<Box<ResultColumn>>),
}
pub enum ResultColumn {
AllFrom(String),
Expr {
expr: Box<Expression>,
rename: Option<String>,
},
}
pub struct GroupBy {
pub groupings: Vec<Box<Expression>>,
pub having: Option<Box<Expression>>,
}
pub enum SetOperator {
Intersect,
Except,
Union,
UnionAll,
}
pub enum UnaryOperator {
Negate,
Not,
IsNull,
}
pub enum BinaryOperator {
Multiply,
Divide,
Add,
Subtract,
Concat,
And,
Or,
}
pub enum ComparisonOperator {
Equal,
NotEqual,
LessThan,
LessEqual,
GreaterThan,
GreaterEqual,
Like,
Is,
IsNot,
}
pub enum Expression {
Literal(Literal),
QualifiedIdentifier(Vec<String>),
MakeTuple(Vec<Box<Expression>>),
Select(SelectStatement),
Unary {
op: UnaryOperator,
expr: Box<Expression>,
},
Binary {
op: BinaryOperator,
left: Box<Expression>,
right: Box<Expression>,
},
Comparison {
op: ComparisonOperator,
left: Box<Expression>,
right: Box<Expression>,
},
In {
expr: Box<Expression>,
set: SetSpecification,
},
Between {
expr: Box<Expression>,
lower: Box<Expression>,
upper: Box<Expression>,
},
Case {
expr: Box<Expression>,
when_part: Vec<WhenClause>,
else_part: Option<Box<Expression>>,
},
}
pub enum SetSpecification {
Select(SelectStatement),
List(Vec<Box<Expression>>),
Name(Vec<String>),
}
pub struct WhenClause {
pub guard: Box<Expression>,
pub body: Box<Expression>,
}
pub enum Literal {
StringLiteral(String),
NumericLiteral(String),
Null,
CurrentTime,
CurrentDate,
CurrentTimestamp,
}
pub enum OrderingDirection {
Ascending,
Descending,
}
pub struct Ordering {
pub expr: Box<Expression>,
pub collation: Option<String>,
pub direction: OrderingDirection,
}
pub struct Limit {
pub number_rows: Box<Expression>,
pub offset_value: Option<Box<Expression>>,
}
pub fn append<T>(list: Vec<T>, item: T) -> Vec<T> {
let mut result = list;
result.push(item);
result
}