450 lines
12 KiB
Rust
450 lines
12 KiB
Rust
//! QueryBuilder
|
|
//!
|
|
//! The QueryBuilder creates sql queries from chained methods
|
|
use std::any::Any;
|
|
use std::collections::HashMap;
|
|
|
|
use crate::drivers::DatabaseDriver;
|
|
|
|
/// The position of the wildcard(s)
|
|
/// for a `like` clause
|
|
#[derive(Debug)]
|
|
pub enum LikeWildcard {
|
|
/// Wildcard before search term
|
|
/// eg. `%foo`
|
|
Before,
|
|
|
|
/// Wildcard after the search term
|
|
/// eg. `foo%`
|
|
After,
|
|
|
|
/// Wildcards surrounding the search term
|
|
/// eg. `%foo%`
|
|
Both,
|
|
}
|
|
|
|
/// The type of SQL join
|
|
#[derive(Debug)]
|
|
pub enum JoinType {
|
|
Inner,
|
|
Outer,
|
|
Left,
|
|
Right,
|
|
LeftOuter,
|
|
RightOuter,
|
|
}
|
|
|
|
/// The sort direction
|
|
#[derive(Debug)]
|
|
pub enum OrderDirection {
|
|
/// Sort Ascending
|
|
Asc,
|
|
/// Sort Descending
|
|
Desc,
|
|
}
|
|
|
|
#[derive(Debug)]
|
|
enum QueryClauseType {
|
|
AndGroupStart,
|
|
GroupEnd,
|
|
GroupStart,
|
|
Like,
|
|
OrGroupStart,
|
|
Where,
|
|
WhereIn,
|
|
}
|
|
|
|
#[derive(Debug)]
|
|
struct QueryClause {
|
|
clause_type: QueryClauseType,
|
|
conjunction: String,
|
|
string: String,
|
|
}
|
|
|
|
impl QueryClause {
|
|
pub fn new(clause_type: QueryClauseType, conjunction: String, string: String) -> Self {
|
|
QueryClause {
|
|
clause_type,
|
|
conjunction,
|
|
string,
|
|
}
|
|
}
|
|
}
|
|
|
|
#[derive(Debug)]
|
|
struct QueryState {
|
|
select_string: String,
|
|
from_string: String,
|
|
set_string: String,
|
|
order_string: String,
|
|
group_string: String,
|
|
|
|
// Keys for insert/update statement
|
|
set_array_keys: Vec<String>,
|
|
|
|
// Order by clause
|
|
order_array: HashMap<String, String>,
|
|
|
|
// Group by clause
|
|
group_array: HashMap<String, String>,
|
|
|
|
// Values to apply to prepared statements
|
|
values: Vec<Box<dyn Any>>,
|
|
|
|
// Values to apply to where clauses in prepared statements
|
|
where_values: Vec<Box<dyn Any>>,
|
|
|
|
limit: Option<usize>,
|
|
|
|
offset: Option<usize>,
|
|
|
|
// Query components for complex selects
|
|
query_map: Vec<QueryClause>,
|
|
|
|
// Query components for having clauses
|
|
having_map: Vec<QueryClause>,
|
|
}
|
|
|
|
impl Default for QueryState {
|
|
fn default() -> Self {
|
|
QueryState {
|
|
select_string: String::from(""),
|
|
from_string: String::from(""),
|
|
set_string: String::from(""),
|
|
order_string: String::from(""),
|
|
group_string: String::from(""),
|
|
|
|
set_array_keys: vec![],
|
|
order_array: HashMap::new(),
|
|
group_array: HashMap::new(),
|
|
values: vec![],
|
|
where_values: vec![],
|
|
|
|
limit: None,
|
|
offset: None,
|
|
|
|
query_map: vec![],
|
|
having_map: vec![],
|
|
}
|
|
}
|
|
}
|
|
|
|
impl QueryState {
|
|
pub fn new() -> Self {
|
|
QueryState::default()
|
|
}
|
|
}
|
|
|
|
/// The struct representing a query builder
|
|
#[derive(Default, Debug)]
|
|
pub struct QueryBuilder {
|
|
state: QueryState,
|
|
driver: Option<Box<dyn DatabaseDriver>>,
|
|
}
|
|
|
|
impl QueryBuilder {
|
|
/// Creates a new QueryBuilder instance
|
|
pub fn new() -> Self {
|
|
QueryBuilder {
|
|
state: QueryState::new(),
|
|
driver: None,
|
|
}
|
|
}
|
|
|
|
// --------------------------------------------------------------------------
|
|
// ! Select Queries
|
|
// --------------------------------------------------------------------------
|
|
|
|
/// Set the fields to select from the database
|
|
pub fn select(&mut self, fields: &str) -> &mut Self {
|
|
unimplemented!();
|
|
}
|
|
|
|
/// Adds the `distinct` keyword to a query
|
|
pub fn distinct(&mut self) -> &mut Self {
|
|
unimplemented!();
|
|
}
|
|
|
|
/// Specify the database table to select from
|
|
pub fn from(&mut self, table_name: &str) -> &mut Self {
|
|
// @TODO properly escape the table name
|
|
self.state.from_string = table_name.to_string();
|
|
|
|
self
|
|
}
|
|
|
|
// --------------------------------------------------------------------------
|
|
// ! 'Like' methods
|
|
// --------------------------------------------------------------------------
|
|
|
|
/// Creates a `like` clause in the sql statement
|
|
pub fn like(&mut self, field: &str, value: Box<dyn Any>, position: LikeWildcard) -> &mut Self {
|
|
unimplemented!();
|
|
}
|
|
|
|
/// Generates an OR Like clause
|
|
pub fn or_like(
|
|
&mut self,
|
|
field: &str,
|
|
value: Box<dyn Any>,
|
|
position: LikeWildcard,
|
|
) -> &mut Self {
|
|
unimplemented!();
|
|
}
|
|
|
|
/// Generates a NOI Like clause
|
|
pub fn not_like(
|
|
&mut self,
|
|
field: &str,
|
|
value: Box<dyn Any>,
|
|
position: LikeWildcard,
|
|
) -> &mut Self {
|
|
unimplemented!();
|
|
}
|
|
|
|
/// Generates an OR NOT Like clause
|
|
pub fn or_not_like(
|
|
&mut self,
|
|
field: &str,
|
|
value: Box<dyn Any>,
|
|
position: LikeWildcard,
|
|
) -> &mut Self {
|
|
unimplemented!();
|
|
}
|
|
|
|
// --------------------------------------------------------------------------
|
|
// ! Having methods
|
|
// --------------------------------------------------------------------------
|
|
|
|
/// Add a `having` clause to the query
|
|
pub fn having(&mut self, key: &str, value: Box<dyn Any>) -> &mut Self {
|
|
unimplemented!();
|
|
}
|
|
|
|
/// Add a `having` clause to the query, prefixed with an `or`
|
|
pub fn or_having(&mut self, key: &str, value: Box<dyn Any>) -> &mut Self {
|
|
unimplemented!();
|
|
}
|
|
|
|
// --------------------------------------------------------------------------
|
|
// ! 'Where' methods
|
|
// --------------------------------------------------------------------------
|
|
|
|
/// Specify a condition for the `where` clause of the query
|
|
pub fn r#where(&mut self, key: &str, value: Box<dyn Any>) -> &mut Self {
|
|
// @TODO actually implement setting the keys for the where
|
|
self.state.where_values.push(value);
|
|
|
|
self
|
|
}
|
|
|
|
/// Specify a condition for the `where` clause of the query, prefixed with `or`
|
|
pub fn or_where(&mut self, key: &str, value: Box<dyn Any>) -> &mut Self {
|
|
unimplemented!();
|
|
}
|
|
|
|
/// Specify a `where in` clause for the query
|
|
pub fn where_in(&mut self, key: &str, value: Vec<Box<dyn Any>>) -> &mut Self {
|
|
unimplemented!();
|
|
}
|
|
|
|
/// Specify a `where in` clause for the query, prefixed with `or`
|
|
pub fn or_where_in(&mut self, key: &str, value: Vec<Box<dyn Any>>) -> &mut Self {
|
|
unimplemented!();
|
|
}
|
|
|
|
/// Specify a `where not in` clause for the query
|
|
pub fn where_not_in(&mut self, key: &str, value: Vec<Box<dyn Any>>) -> &mut Self {
|
|
unimplemented!();
|
|
}
|
|
|
|
/// Specify a `where not in` clause for the query, prefixed with `or`
|
|
pub fn or_where_not_in(&mut self, key: &str, value: Vec<Box<dyn Any>>) -> &mut Self {
|
|
unimplemented!();
|
|
}
|
|
|
|
// --------------------------------------------------------------------------
|
|
// ! Other Query Modifier methods
|
|
// --------------------------------------------------------------------------
|
|
|
|
/// Set a key and value for an insert or update query
|
|
pub fn set(&mut self, key: &str, value: Box<dyn Any>) -> &mut Self {
|
|
// @TODO figure a way to make this easier to use
|
|
self.state.set_array_keys.push(key.to_string());
|
|
self.state.values.push(value);
|
|
|
|
self
|
|
}
|
|
|
|
/// Set a map of data for an insert or update query
|
|
pub fn set_map(&mut self, data: HashMap<String, Box<dyn Any>>) -> &mut Self {
|
|
for (key, value) in data {
|
|
self.set(&key, value);
|
|
}
|
|
|
|
self
|
|
}
|
|
|
|
/// Add a table join to the query
|
|
pub fn join(&mut self, table: &str, condition: &str, join_type: JoinType) -> &mut Self {
|
|
unimplemented!();
|
|
}
|
|
|
|
/// Add a group by clause to the query
|
|
pub fn group_by(&mut self, field: &str) -> &mut Self {
|
|
unimplemented!();
|
|
}
|
|
|
|
/// Add an order by clause to the query
|
|
pub fn order_by(&mut self, field: &str, direction: OrderDirection) -> &mut Self {
|
|
unimplemented!();
|
|
}
|
|
|
|
/// Add a limit to the query
|
|
pub fn limit(&mut self, limit: usize) -> &mut Self {
|
|
self.state.limit = Some(limit);
|
|
|
|
self
|
|
}
|
|
|
|
/// Add an offset to the query
|
|
pub fn offset(&mut self, offset: usize) -> &mut Self {
|
|
self.state.offset = Some(offset);
|
|
|
|
self
|
|
}
|
|
|
|
// --------------------------------------------------------------------------
|
|
// ! Query Grouping Methods
|
|
// --------------------------------------------------------------------------
|
|
|
|
/// Start a logical grouping in the current query
|
|
pub fn group_start(&mut self) -> &mut Self {
|
|
unimplemented!();
|
|
}
|
|
|
|
/// Start a logical grouping, prefixed with `not`
|
|
pub fn not_group_start(&mut self) -> &mut Self {
|
|
unimplemented!();
|
|
}
|
|
|
|
/// Start a logical grouping, prefixed with `or`
|
|
pub fn or_group_start(&mut self) -> &mut Self {
|
|
unimplemented!();
|
|
}
|
|
|
|
/// Start a logical grouping, prefixed with `or not`
|
|
pub fn or_not_group_start(&mut self) -> &mut Self {
|
|
unimplemented!();
|
|
}
|
|
|
|
/// End the current logical grouping
|
|
pub fn group_end(&mut self) -> &mut Self {
|
|
unimplemented!();
|
|
}
|
|
|
|
// --------------------------------------------------------------------------
|
|
// ! Query execution methods
|
|
// --------------------------------------------------------------------------
|
|
|
|
/// Execute the built query
|
|
pub fn get(self) -> Box<dyn Any> {
|
|
unimplemented!();
|
|
}
|
|
|
|
/// Count all the rows in the specified database table
|
|
pub fn count_all(self, table: &str) -> usize {
|
|
unimplemented!();
|
|
}
|
|
|
|
/// Execute the generated insert query
|
|
pub fn insert(&mut self, table: &str) {
|
|
// @TODO determine query result type
|
|
unimplemented!();
|
|
}
|
|
|
|
/// Execute the generated update query
|
|
pub fn update(&mut self, table: &str) {
|
|
// @TODO determine query result type
|
|
unimplemented!();
|
|
}
|
|
|
|
/// Execute the generated delete query
|
|
pub fn delete(&mut self, table: &str) {
|
|
unimplemented!();
|
|
}
|
|
|
|
// --------------------------------------------------------------------------
|
|
// ! SQL Returning Methods
|
|
// --------------------------------------------------------------------------
|
|
|
|
/// Get the generated SQL for a select query
|
|
pub fn get_compiled_select(self) -> String {
|
|
unimplemented!();
|
|
}
|
|
|
|
/// Get the generated SQL for an insert query
|
|
pub fn get_compiled_insert(self) -> String {
|
|
unimplemented!();
|
|
}
|
|
|
|
/// Get the generated SQL for an update query
|
|
pub fn get_compiled_update(self) -> String {
|
|
unimplemented!();
|
|
}
|
|
|
|
/// Get the generated SQL for a delete query
|
|
pub fn get_compiled_delete(self) -> String {
|
|
unimplemented!();
|
|
}
|
|
|
|
// --------------------------------------------------------------------------
|
|
// ! Miscellaneous Methods
|
|
// --------------------------------------------------------------------------
|
|
|
|
/// Get a new instance of the query builder
|
|
pub fn reset_query(&mut self) -> Self {
|
|
QueryBuilder::new()
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
|
|
#[test]
|
|
fn set_key_value() {
|
|
let mut qb = QueryBuilder::new();
|
|
|
|
qb.set("foo", Box::new("bar"));
|
|
|
|
assert_eq!(qb.state.set_array_keys[0], "foo");
|
|
assert!(qb.state.values[0].is::<&str>());
|
|
|
|
// @TODO find a way to make this kind of operation much more ergonomic
|
|
assert_eq!(*qb.state.values[0].downcast_ref::<&str>().unwrap(), "bar");
|
|
}
|
|
|
|
#[test]
|
|
fn set_hashmap() {
|
|
let mut qb = QueryBuilder::new();
|
|
|
|
let mut authors: HashMap<String, Box<dyn Any>> = HashMap::new();
|
|
authors.insert(
|
|
String::from("Chinua Achebe"),
|
|
Box::new(String::from("Nigeria")),
|
|
);
|
|
authors.insert(
|
|
String::from("Rabindranath Tagore"),
|
|
Box::new(String::from("India")),
|
|
);
|
|
authors.insert(String::from("Anita Nair"), Box::new(String::from("India")));
|
|
|
|
qb.set_map(authors);
|
|
|
|
// assert_eq!(qb.state.set_array_keys[0], "Chinua Achebe");
|
|
assert_eq!(qb.state.set_array_keys.len(), 3);
|
|
assert_eq!(qb.state.values.len(), 3);
|
|
}
|
|
}
|