sea_schema/mysql/query/
column.rs

1use super::{InformationSchema, SchemaQueryBuilder};
2use crate::sqlx_types::mysql::MySqlRow;
3use sea_query::{Expr, Iden, Order, Query, SeaRc, SelectStatement, Value};
4
5#[derive(Debug, sea_query::Iden)]
6/// Ref: https://dev.mysql.com/doc/refman/8.0/en/information-schema-columns-table.html
7pub enum ColumnFields {
8    TableCatalog,
9    TableSchema,
10    TableName,
11    ColumnName,
12    OrdinalPosition,
13    ColumnDefault,
14    IsNullable,
15    DataType,
16    CharacterMaximumLength,
17    CharacterOctetLength,
18    NumericPrecision,
19    NumericScale,
20    DatetimePrecision,
21    CharacterSetName,
22    CollationName,
23    ColumnType,
24    ColumnKey,
25    Extra,
26    Privileges,
27    ColumnComment,
28    GenerationExpression,
29    SrsId,
30}
31
32#[derive(Debug, Default)]
33pub struct ColumnQueryResult {
34    pub column_name: String,
35    pub column_type: String,
36    pub is_nullable: String,
37    pub column_key: String,
38    pub column_default: Option<String>,
39    pub extra: String,
40    pub generation_expression: Option<String>,
41    pub column_comment: String,
42}
43
44impl SchemaQueryBuilder {
45    pub fn query_columns(
46        &self,
47        schema: SeaRc<dyn Iden>,
48        table: SeaRc<dyn Iden>,
49    ) -> SelectStatement {
50        Query::select()
51            .columns([
52                ColumnFields::ColumnName,
53                ColumnFields::ColumnType,
54                ColumnFields::IsNullable,
55                ColumnFields::ColumnKey,
56                ColumnFields::ColumnDefault,
57                ColumnFields::Extra,
58            ])
59            .conditions(
60                self.system.is_mysql() && self.system.version >= 50700,
61                |q| {
62                    q.column(ColumnFields::GenerationExpression);
63                },
64                |q| {
65                    q.expr(Expr::val(Value::String(None)));
66                },
67            )
68            .column(ColumnFields::ColumnComment)
69            .from((InformationSchema::Schema, InformationSchema::Columns))
70            .and_where(Expr::col(ColumnFields::TableSchema).eq(schema.to_string()))
71            .and_where(Expr::col(ColumnFields::TableName).eq(table.to_string()))
72            .order_by(ColumnFields::OrdinalPosition, Order::Asc)
73            .take()
74    }
75}
76
77#[cfg(feature = "sqlx-mysql")]
78impl From<&MySqlRow> for ColumnQueryResult {
79    fn from(row: &MySqlRow) -> Self {
80        use crate::mysql::discovery::GetMySqlValue;
81        Self {
82            column_name: row.get_string(0),
83            column_type: row.get_string(1),
84            is_nullable: row.get_string(2),
85            column_key: row.get_string(3),
86            column_default: row.get_string_opt(4),
87            extra: row.get_string(5),
88            generation_expression: row.get_string_opt(6),
89            column_comment: row.get_string(7),
90        }
91    }
92}
93
94#[cfg(not(feature = "sqlx-mysql"))]
95impl From<&MySqlRow> for ColumnQueryResult {
96    fn from(_: &MySqlRow) -> Self {
97        Self::default()
98    }
99}
sea_schema/mysql/query/column.rs

sea_schema/mysql/query/
column.rs
