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use super::{InformationSchema, SchemaQueryBuilder};
use crate::sqlx_types::mysql::MySqlRow;
use sea_query::{Expr, Iden, Order, Query, SeaRc, SelectStatement};
#[derive(Debug, sea_query::Iden)]
pub enum ColumnFields {
TableCatalog,
TableSchema,
TableName,
ColumnName,
OrdinalPosition,
ColumnDefault,
IsNullable,
DataType,
CharacterMaximumLength,
CharacterOctetLength,
NumericPrecision,
NumericScale,
DatetimePrecision,
CharacterSetName,
CollationName,
ColumnType,
ColumnKey,
Extra,
Privileges,
ColumnComment,
GenerationExpression,
SrsId,
}
#[derive(Debug, Default)]
pub struct ColumnQueryResult {
pub column_name: String,
pub column_type: String,
pub is_nullable: String,
pub column_key: String,
pub column_default: Option<String>,
pub extra: String,
pub generation_expression: Option<String>,
pub column_comment: String,
}
impl SchemaQueryBuilder {
pub fn query_columns(
&self,
schema: SeaRc<dyn Iden>,
table: SeaRc<dyn Iden>,
) -> SelectStatement {
Query::select()
.columns(vec![
ColumnFields::ColumnName,
ColumnFields::ColumnType,
ColumnFields::IsNullable,
ColumnFields::ColumnKey,
ColumnFields::ColumnDefault,
ColumnFields::Extra,
ColumnFields::GenerationExpression,
ColumnFields::ColumnComment,
])
.from((InformationSchema::Schema, InformationSchema::Columns))
.and_where(Expr::col(ColumnFields::TableSchema).eq(schema.to_string()))
.and_where(Expr::col(ColumnFields::TableName).eq(table.to_string()))
.order_by(ColumnFields::OrdinalPosition, Order::Asc)
.take()
}
}
#[cfg(feature = "sqlx-mysql")]
impl From<&MySqlRow> for ColumnQueryResult {
fn from(row: &MySqlRow) -> Self {
use crate::sqlx_types::Row;
Self {
column_name: row.get(0),
column_type: row.get(1),
is_nullable: row.get(2),
column_key: row.get(3),
column_default: row.get(4),
extra: row.get(5),
generation_expression: row.get(6),
column_comment: row.get(7),
}
}
}
#[cfg(not(feature = "sqlx-mysql"))]
impl From<&MySqlRow> for ColumnQueryResult {
fn from(row: &MySqlRow) -> Self {
Self::default()
}
}