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use crate::DbBackend;
use sea_query::{inject_parameters, MysqlQueryBuilder, PostgresQueryBuilder, SqliteQueryBuilder};
pub use sea_query::{Value, Values};
use std::fmt;
#[derive(Debug, Clone, PartialEq)]
pub struct Statement {
pub sql: String,
pub values: Option<Values>,
pub db_backend: DbBackend,
}
pub trait StatementBuilder {
fn build(&self, db_backend: &DbBackend) -> Statement;
}
impl Statement {
pub fn from_string(db_backend: DbBackend, stmt: String) -> Statement {
Statement {
sql: stmt,
values: None,
db_backend,
}
}
pub fn from_sql_and_values<I>(db_backend: DbBackend, sql: &str, values: I) -> Self
where
I: IntoIterator<Item = Value>,
{
Self::from_string_values_tuple(
db_backend,
(sql.to_owned(), Values(values.into_iter().collect())),
)
}
pub(crate) fn from_string_values_tuple(
db_backend: DbBackend,
stmt: (String, Values),
) -> Statement {
Statement {
sql: stmt.0,
values: Some(stmt.1),
db_backend,
}
}
}
impl fmt::Display for Statement {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match &self.values {
Some(values) => {
let string = inject_parameters(
&self.sql,
values.0.clone(),
self.db_backend.get_query_builder().as_ref(),
);
write!(f, "{}", &string)
}
None => {
write!(f, "{}", &self.sql)
}
}
}
}
macro_rules! build_any_stmt {
($stmt: expr, $db_backend: expr) => {
match $db_backend {
DbBackend::MySql => $stmt.build(MysqlQueryBuilder),
DbBackend::Postgres => $stmt.build(PostgresQueryBuilder),
DbBackend::Sqlite => $stmt.build(SqliteQueryBuilder),
}
};
}
macro_rules! build_postgres_stmt {
($stmt: expr, $db_backend: expr) => {
match $db_backend {
DbBackend::Postgres => $stmt.to_string(PostgresQueryBuilder),
DbBackend::MySql | DbBackend::Sqlite => unimplemented!(),
}
};
}
macro_rules! build_query_stmt {
($stmt: ty) => {
impl StatementBuilder for $stmt {
fn build(&self, db_backend: &DbBackend) -> Statement {
let stmt = build_any_stmt!(self, db_backend);
Statement::from_string_values_tuple(*db_backend, stmt)
}
}
};
}
build_query_stmt!(sea_query::InsertStatement);
build_query_stmt!(sea_query::SelectStatement);
build_query_stmt!(sea_query::UpdateStatement);
build_query_stmt!(sea_query::DeleteStatement);
macro_rules! build_schema_stmt {
($stmt: ty) => {
impl StatementBuilder for $stmt {
fn build(&self, db_backend: &DbBackend) -> Statement {
let stmt = build_any_stmt!(self, db_backend);
Statement::from_string(*db_backend, stmt)
}
}
};
}
build_schema_stmt!(sea_query::TableCreateStatement);
build_schema_stmt!(sea_query::TableDropStatement);
build_schema_stmt!(sea_query::TableAlterStatement);
build_schema_stmt!(sea_query::TableRenameStatement);
build_schema_stmt!(sea_query::TableTruncateStatement);
build_schema_stmt!(sea_query::IndexCreateStatement);
build_schema_stmt!(sea_query::IndexDropStatement);
build_schema_stmt!(sea_query::ForeignKeyCreateStatement);
build_schema_stmt!(sea_query::ForeignKeyDropStatement);
macro_rules! build_type_stmt {
($stmt: ty) => {
impl StatementBuilder for $stmt {
fn build(&self, db_backend: &DbBackend) -> Statement {
let stmt = build_postgres_stmt!(self, db_backend);
Statement::from_string(*db_backend, stmt)
}
}
};
}
build_type_stmt!(sea_query::extension::postgres::TypeAlterStatement);
build_type_stmt!(sea_query::extension::postgres::TypeCreateStatement);
build_type_stmt!(sea_query::extension::postgres::TypeDropStatement);