elefant-tools 0.0.2

A library for doing things like pg_dump and pg_restore, with extra features, and probably more bugs.
Documentation 
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use crate::postgres_client_wrapper::FromRow;
use crate::schema_reader::define_working_query;
use tokio_postgres::Row;

pub struct ViewColumnResult {
    pub view_name: String,
    pub schema_name: String,
    pub column_name: String,
    pub ordinal_position: i32,
    // pub comment: Option<String>,
}

impl FromRow for ViewColumnResult {
    fn from_row(row: Row) -> crate::Result<Self> {
        Ok(Self {
            view_name: row.try_get(0)?,
            schema_name: row.try_get(1)?,
            column_name: row.try_get(2)?,
            ordinal_position: row.try_get(3)?,
            // comment: row.try_get(4)?,
        })
    }
}

//language=postgresql
define_working_query!(
    get_view_columns,
    ViewColumnResult,
    r#"
select tab.relname  as view_name,
       ns.nspname   as schema_name,
       attr.attname as column_name,
       attr.attnum::int4  as ordinal_position,
         d.description as comment
from pg_class tab
         join pg_namespace ns on tab.relnamespace = ns.oid
         join pg_attribute attr on attr.attrelid = tab.oid
         left join pg_description d on d.objoid = attr.attrelid and d.objsubid = attr.attnum
         left join pg_depend dep on dep.objid = ns.oid
where tab.oid > 16384
  and tab.relkind in('v', 'm')
  and attr.attnum > 0
  and (dep.objid is null or dep.deptype <> 'e' )
order by ns.nspname, tab.relname, attr.attnum;
"#
);