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use tiberius::ToSql;
/// Column Expression
pub struct ColExpr {
pub(crate) table: &'static str,
pub(crate) field: &'static str,
}
impl ColExpr {
/// generate filter expression checking whether this column equals to a value.
/// ```no_run
/// # use ssql::prelude::*;
/// # #[derive(ORM)]
/// # #[ssql(table = person)]
/// # struct Person{
/// # id: i32,
/// # email: Option<String>,
/// # }
/// let query = Person::query().filter(
/// Person::col("id")?.eq(&5)
/// )?;
/// ```
/// SQL: `... WHERE person.id = 5`
pub fn eq(self, other: &dyn ToSql) -> FilterExpr {
self.expr_wrapper(ConditionVar::Eq(other))
}
/// generate filter expression checking whether this column not equals to a value.
/// ```no_run
/// # use ssql::prelude::*;
/// # #[derive(ORM)]
/// # #[ssql(table = person)]
/// # struct Person{
/// # id: i32,
/// # email: Option<String>,
/// # }
/// let query = Person::query().filter(
/// Person::col("id")?.neq(&5)
/// )?;
/// ```
/// SQL: `... WHERE person.id <> 5`
pub fn neq(self, other: &dyn ToSql) -> FilterExpr {
self.expr_wrapper(ConditionVar::Neq(other))
}
/// generate filter expression checking whether this column is less than a value.
/// ```no_run
/// # use ssql::prelude::*;
/// # #[derive(ORM)]
/// # #[ssql(table = person)]
/// # struct Person{
/// # id: i32,
/// # email: Option<String>,
/// # }
/// let query = Person::query().filter(
/// Person::col("email")?.lt(&5)
/// )?;
/// ```
/// SQL: `... WHERE person.id < 5`
pub fn lt(self, other: &dyn ToSql) -> FilterExpr {
self.expr_wrapper(ConditionVar::Lt(other))
}
/// generate filter expression checking whether this column is less or equal than a value.
/// ```no_run
/// # use ssql::prelude::*;
/// # #[derive(ORM)]
/// # #[ssql(table = person)]
/// # struct Person{
/// # id: i32,
/// # email: Option<String>,
/// # }
/// let query = Person::query().filter(
/// Person::col("email")?.lt_eq(&5)
/// )?;
/// ```
/// SQL: `... WHERE person.id <= 5`
pub fn lt_eq(self, other: &dyn ToSql) -> FilterExpr {
self.expr_wrapper(ConditionVar::LtEq(other))
}
/// generate filter expression checking whether this column is greater than a value.
/// ```no_run
/// # use ssql::prelude::*;
/// # #[derive(ORM)]
/// # #[ssql(table = person)]
/// # struct Person{
/// # id: i32,
/// # email: Option<String>,
/// # }
/// let query = Person::query().filter(
/// Person::col("email")?.gt(&5)
/// )?;
/// ```
/// SQL: `... WHERE person.id > 5`
pub fn gt(self, other: &dyn ToSql) -> FilterExpr {
self.expr_wrapper(ConditionVar::Gt(other))
}
/// generate filter expression checking whether this column is greater or equal than a value.
/// ```no_run
/// # use ssql::prelude::*;
/// # #[derive(ORM)]
/// # #[ssql(table = person)]
/// # struct Person{
/// # id: i32,
/// # email: Option<String>,
/// # }
/// let query = Person::query().filter(
/// Person::col("email")?.gt_eq(&5)
/// )?;
/// ```
/// SQL: `... WHERE person.id >= 5`
pub fn gt_eq(self, other: &dyn ToSql) -> FilterExpr {
self.expr_wrapper(ConditionVar::GtEq(other))
}
/// generate filter expression checking whether this column is null.
/// ```no_run
/// # use ssql::prelude::*;
/// # #[derive(ORM)]
/// # #[ssql(table = person)]
/// # struct Person{
/// # id: i32,
/// # email: Option<String>,
/// # }
/// let query = Person::query().filter(
/// Person::col("email")?.is_null()
/// )?;
/// ```
/// SQL: `**... WHERE person.email IS NULL**`
pub fn is_null<'b>(self) -> FilterExpr<'b> {
self.expr_wrapper(ConditionVar::IsNull)
}
/// generate filter expression checking whether this column is not null.
/// ```no_run
/// # use ssql::prelude::*;
/// # #[derive(ORM)]
/// # #[ssql(table = person)]
/// # struct Person{
/// # id: i32,
/// # email: Option<String>,
/// # }
/// let query = Person::query().filter(
/// Person::col("email")?.is_not_null()
/// )?;
/// ```
/// SQL: `... WHERE person.email IS NOT NULL`
pub fn is_not_null<'b>(self) -> FilterExpr<'b> {
self.expr_wrapper(ConditionVar::IsNotNull)
}
/// generate filter expression checking whether a char column contains a given str.
/// ```no_run
/// # use ssql::prelude::*;
/// # #[derive(ORM)]
/// # #[ssql(table = person)]
/// # struct Person{
/// # id: i32,
/// # email: Option<String>,
/// # }
/// let query = Person::query().filter(
/// Person::col("email")?.contains("gmail")
/// )?;
/// ```
/// SQL: `... WHERE person.email LIKE '%gmail%' `
pub fn contains<'b>(self, other: &'b str) -> FilterExpr<'b> {
self.expr_wrapper(ConditionVar::Contains(other))
}
/// generate filter expression checking whether a char column starts with a given str.
/// ```no_run
/// # use ssql::prelude::*;
/// # #[derive(ORM)]
/// # #[ssql(table = person)]
/// # struct Person{
/// # id: i32,
/// # email: Option<String>,
/// # }
/// let query = Person::query().filter(
/// Person::col("email")?.startswith("john")
/// )?;
/// ```
/// SQL: `... WHERE person.email LIKE 'john%' `
pub fn startswith<'b>(self, other: &'b str) -> FilterExpr<'b> {
self.expr_wrapper(ConditionVar::StarsWith(other))
}
/// generate filter expression checking whether a char column ends with a given str.
/// ```no_run
/// # use ssql::prelude::*;
/// # #[derive(ORM)]
/// # #[ssql(table = person)]
/// # struct Person{
/// # id: i32,
/// # email: Option<String>,
/// # }
/// let query = Person::query().filter(
/// Person::col("email")?.endswith("gmail.com")
/// )?;
/// ```
/// SQL: `... WHERE person.email LIKE '%gmail.com' `
pub fn endswith<'b>(self, other: &'b str) -> FilterExpr<'b> {
self.expr_wrapper(ConditionVar::EndsWith(other))
}
/// generate filter expression checking whether a value in a given list.
/// ```no_run
/// # use ssql::prelude::*;
/// # #[derive(ORM)]
/// # #[ssql(table = person)]
/// # struct Person{
/// # id: i32,
/// # email: Option<String>,
/// # }
/// let query = Person::query().filter(
/// Person::col("id")?.is_in(&[3,4,5,6,7])
/// )?;
/// ```
/// SQL: `... WHERE person.id IN (3,4,5,6,7) `
pub fn is_in(self, ls: &[impl ToSql]) -> FilterExpr {
let v = ls.iter().map(|x| x as &dyn ToSql).collect();
self.expr_wrapper(ConditionVar::IsIn(v))
}
/// generate filter expression checking whether a value in a given list.
/// This method allows for providing different types of args.
/// ```no_run
/// # use ssql::prelude::*;
/// # #[derive(ORM)]
/// # #[ssql(table = person)]
/// # struct Person{
/// # id: i32,
/// # email: Option<String>,
/// # }
/// let query = Person::query().filter(
/// Person::col("email")?.is_in_ref(&[&3, &"4", &5])
/// )?;
/// ```
/// SQL: `... WHERE person.id IN (3,'4',5) `
pub fn is_in_ref<'b>(self, ls: &[&'b dyn ToSql]) -> FilterExpr<'b> {
let v = ls.to_vec();
self.expr_wrapper(ConditionVar::IsIn(v))
}
/// generate filter expression checking whether a value between a range.
/// ```no_run
/// # use ssql::prelude::*;
/// # #[derive(ORM)]
/// # #[ssql(table = person)]
/// # struct Person{
/// # id: i32,
/// # email: Option<String>,
/// # }
/// let query = Person::query().filter(
/// Person::col("email")?.between(&3, &7)
/// )?;
/// ```
/// SQL: `... WHERE person.id BETWEEN 3 AND 7 `
pub fn between<'b>(self, start: &'b dyn ToSql, end: &'b dyn ToSql) -> FilterExpr<'b> {
self.expr_wrapper(ConditionVar::Between((start, end)))
}
fn expr_wrapper(self, con: ConditionVar) -> FilterExpr {
FilterExpr {
col: self,
con,
or_cons: vec![],
}
}
pub(crate) fn full_column_name(&self) -> String {
format!("{}.{}", self.table, self.field)
}
}
/// Filter expression used in [`query.filter`] method.
///
/// [`query.filter`]: struct.QueryBuilder.html#method.filter
pub struct FilterExpr<'b> {
pub(crate) col: ColExpr,
con: ConditionVar<'b>,
or_cons: Vec<FilterExpr<'b>>,
}
impl<'b> FilterExpr<'b> {
pub(crate) fn to_sql(&self, idx: &mut i32, query_params: &mut Vec<&'b dyn ToSql>) -> String {
match self.or_cons.is_empty() {
true => self.to_sql_wrapper(idx, query_params),
false => {
let tmp = self
.or_cons
.iter()
.chain([self])
.map(|x| x.to_sql_wrapper(idx, query_params))
.reduce(|cur, nxt| format!("{cur} OR {nxt}"))
.unwrap();
format!("( {} )", tmp)
}
}
}
pub(crate) fn to_sql_wrapper(
&self,
idx: &mut i32,
query_params: &mut Vec<&'b dyn ToSql>,
) -> String {
match &self.con {
ConditionVar::Eq(v)
| ConditionVar::Neq(v)
| ConditionVar::Gt(v)
| ConditionVar::GtEq(v)
| ConditionVar::Lt(v)
| ConditionVar::LtEq(v) => {
query_params.push(*v);
*idx += 1;
format!(
" {} {} @p{}",
self.col.full_column_name(),
self.con.to_sql_symbol(),
idx
)
}
ConditionVar::IsNull | ConditionVar::IsNotNull => {
format!(
"{} {}",
self.col.full_column_name(),
self.con.to_sql_symbol()
)
}
ConditionVar::Contains(v) => {
format!("{} LIKE '%{}%' ", self.col.full_column_name(), v)
}
ConditionVar::IsIn(v) => {
let mut i = *idx;
*idx += v.len() as i32;
let cond_params = v
.iter()
.map(|_| {
i += 1;
format!("@p{}", i)
})
.reduce(|cur, nxt| format!("{},{}", cur, nxt))
.unwrap();
query_params.extend(v);
format!("{} IN ({})", self.col.full_column_name(), cond_params)
}
ConditionVar::Between((v1, v2)) => {
*idx += 2;
query_params.push(*v1);
query_params.push(*v2);
format!(
"{} BETWEEN @p{} AND @p{}",
self.col.full_column_name(),
*idx - 1,
idx
)
}
ConditionVar::StarsWith(v) => {
format!("{} LIKE '{}%' ", self.col.full_column_name(), v)
}
ConditionVar::EndsWith(v) => {
format!("{} LIKE '%{}' ", self.col.full_column_name(), v)
}
}
}
/// supplement 'or' filters for current filter statement.
/// ```no_run
/// # use ssql::prelude::*;
/// # #[derive(ORM)]
/// # #[ssql(table = person)]
/// # struct Person{
/// # id: i32,
/// # email: Option<String>,
/// # }
/// let query = Person::query().filter(
/// Person::col("id")?.is_in_ref(&[&3, &"4", &5])
/// .or(Person::col("id")?.gt(&20))
/// )?
/// .filter(
/// Person::col("email")?.contains("gmail")
/// )?;
/// ```
/// SQL: `... WHERE (person.id IN (3,'4',5) OR person.id > 20) AND person.email LIKE '%gmail%' `
pub fn or(mut self, rhs: FilterExpr<'b>) -> Self {
self.or_cons.push(rhs);
self
}
}
enum ConditionVar<'a> {
Eq(&'a dyn ToSql),
Neq(&'a dyn ToSql),
Gt(&'a dyn ToSql),
GtEq(&'a dyn ToSql),
Lt(&'a dyn ToSql),
LtEq(&'a dyn ToSql),
IsNull,
IsNotNull,
IsIn(Vec<&'a dyn ToSql>),
Contains(&'a str),
StarsWith(&'a str),
EndsWith(&'a str),
Between((&'a dyn ToSql, &'a dyn ToSql)),
}
impl<'a> ConditionVar<'a> {
fn to_sql_symbol(&self) -> &'static str {
match self {
ConditionVar::Eq(_) => "=",
ConditionVar::Neq(_) => "<>",
ConditionVar::Gt(_) => ">",
ConditionVar::GtEq(_) => ">=",
ConditionVar::Lt(_) => "<",
ConditionVar::LtEq(_) => "<=",
ConditionVar::IsNull => "is null",
ConditionVar::IsNotNull => "is not null",
ConditionVar::Contains(_) => "",
ConditionVar::IsIn(_) => "",
ConditionVar::Between(_) => "",
ConditionVar::StarsWith(_) => "",
ConditionVar::EndsWith(_) => "",
}
}
}