rqb 0.1.3

sqlx-first typed Postgres query builder.
Documentation 
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use crate::{BoolExpr, ValueExpr};

use super::{function, literal};

/// Stable date/time part names accepted by helpers such as `date_trunc`.
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
#[non_exhaustive]
pub enum DatePart {
    /// `microseconds`.
    Microseconds,
    /// `milliseconds`.
    Milliseconds,
    /// `second`.
    Second,
    /// `minute`.
    Minute,
    /// `hour`.
    Hour,
    /// `day`.
    Day,
    /// `week`.
    Week,
    /// `month`.
    Month,
    /// `quarter`.
    Quarter,
    /// `year`.
    Year,
    /// `decade`.
    Decade,
    /// `century`.
    Century,
    /// `millennium`.
    Millennium,
}

impl DatePart {
    /// Returns the PostgreSQL date/time field token.
    #[inline]
    pub const fn as_sql(self) -> &'static str {
        match self {
            Self::Microseconds => "microseconds",
            Self::Milliseconds => "milliseconds",
            Self::Second => "second",
            Self::Minute => "minute",
            Self::Hour => "hour",
            Self::Day => "day",
            Self::Week => "week",
            Self::Month => "month",
            Self::Quarter => "quarter",
            Self::Year => "year",
            Self::Decade => "decade",
            Self::Century => "century",
            Self::Millennium => "millennium",
        }
    }
}

/// Builds `now()`.
pub fn now() -> ValueExpr {
    function("now", Vec::<ValueExpr>::new())
}

/// Builds the `CURRENT_TIMESTAMP` SQL keyword.
pub fn current_timestamp() -> ValueExpr {
    ValueExpr::Keyword("CURRENT_TIMESTAMP")
}

/// Builds the `CURRENT_DATE` SQL keyword.
pub fn current_date() -> ValueExpr {
    ValueExpr::Keyword("CURRENT_DATE")
}

/// Builds `date_trunc(part, expr)`.
pub fn date_trunc(part: impl Into<ValueExpr>, expr: impl Into<ValueExpr>) -> ValueExpr {
    function("date_trunc", [part.into(), expr.into()])
}

/// Builds `date_trunc('part', expr)` with a typed static date part.
pub fn date_trunc_part(part: DatePart, expr: impl Into<ValueExpr>) -> ValueExpr {
    date_trunc(literal(part.as_sql()), expr)
}

/// Builds `date_bin(stride, source, origin)`.
pub fn date_bin(
    stride: impl Into<ValueExpr>,
    source: impl Into<ValueExpr>,
    origin: impl Into<ValueExpr>,
) -> ValueExpr {
    function("date_bin", [stride.into(), source.into(), origin.into()])
}

/// Builds `to_char(value, format)`.
pub fn to_char(value: impl Into<ValueExpr>, format: impl Into<ValueExpr>) -> ValueExpr {
    function("to_char", [value.into(), format.into()])
}

/// Builds `to_date(text, format)`.
pub fn to_date(text: impl Into<ValueExpr>, format: impl Into<ValueExpr>) -> ValueExpr {
    function("to_date", [text.into(), format.into()])
}

/// Builds `to_timestamp(text, format)`.
pub fn to_timestamp(text: impl Into<ValueExpr>, format: impl Into<ValueExpr>) -> ValueExpr {
    function("to_timestamp", [text.into(), format.into()])
}

/// Builds `to_number(text, format)`.
pub fn to_number(text: impl Into<ValueExpr>, format: impl Into<ValueExpr>) -> ValueExpr {
    function("to_number", [text.into(), format.into()])
}

/// Builds `isfinite(value)`.
pub fn isfinite(value: impl Into<ValueExpr>) -> BoolExpr {
    function("isfinite", [value]).is_true()
}

/// Builds `EXTRACT(field FROM expr)`.
pub fn extract(field: &'static str, expr: impl Into<ValueExpr>) -> ValueExpr {
    ValueExpr::extract(field, expr.into())
}

/// Builds `age(...)` with one or two arguments.
pub fn age(args: impl IntoIterator<Item = impl Into<ValueExpr>>) -> ValueExpr {
    function("age", args)
}

/// Builds `make_date(year, month, day)`.
pub fn make_date(
    year: impl Into<ValueExpr>,
    month: impl Into<ValueExpr>,
    day: impl Into<ValueExpr>,
) -> ValueExpr {
    function("make_date", [year.into(), month.into(), day.into()])
}

/// Builds `make_time(hour, min, sec)`.
pub fn make_time(
    hour: impl Into<ValueExpr>,
    min: impl Into<ValueExpr>,
    sec: impl Into<ValueExpr>,
) -> ValueExpr {
    function("make_time", [hour.into(), min.into(), sec.into()])
}

/// Builds `make_timestamp(...)`.
pub fn make_timestamp(args: impl IntoIterator<Item = impl Into<ValueExpr>>) -> ValueExpr {
    function("make_timestamp", args)
}

/// Builds `make_timestamptz(...)`.
pub fn make_timestamptz(args: impl IntoIterator<Item = impl Into<ValueExpr>>) -> ValueExpr {
    function("make_timestamptz", args)
}

/// Builds `timezone(zone, expr)`.
pub fn timezone(zone: impl Into<ValueExpr>, expr: impl Into<ValueExpr>) -> ValueExpr {
    function("timezone", [zone.into(), expr.into()])
}