Merge pull request #63 from hasura/djh/table-introspection

Basic table introspection

crates/ndc-sqlserver/src/configuration/introspection.rs

@@ -0,0 +1,49 @@
+//! Configuration and state for our connector.
+use serde::Deserialize;
+
+#[derive(Deserialize, Debug)]
+pub struct IntrospectionTable {
+    pub name: String,
+    pub type_desc: String,
+    pub joined_sys_schema: IntrospectionSchema,
+    pub joined_sys_column: Vec<IntrospectionColumn>,
+    pub joined_sys_primary_key: Option<IntrospectionPrimaryKey>,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct IntrospectionColumn {
+    pub name: String,
+    pub is_nullable: bool,
+    pub is_identity: bool,
+    pub is_computed: bool,
+    pub joined_sys_type: IntrospectionType,
+    pub joined_foreign_key_columns: Vec<IntrospectionForeignKeyColumn>,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct IntrospectionType {
+    pub name: String,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct IntrospectionPrimaryKey {
+    pub name: String,
+    pub columns: Vec<IntrospectionPrimaryKeyColumn>,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct IntrospectionPrimaryKeyColumn {
+    pub name: String,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct IntrospectionForeignKeyColumn {
+    pub joined_referenced_table_name: String,
+    pub joined_referenced_column_name: String,
+    pub joined_referenced_sys_schema: IntrospectionSchema,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct IntrospectionSchema {
+    pub name: String,
+}

crates/ndc-sqlserver/src/configuration/mod.rs

@@ -0,0 +1,7 @@
+pub mod introspection;
+pub mod version1;
+
+pub use version1::{
+    configure, create_state, occurring_scalar_types, validate_raw_configuration, Configuration,
+    InitializationError, RawConfiguration, State,
+};

crates/ndc-sqlserver/src/configuration/table_configuration.sql

@@ -0,0 +1,60 @@
+-- SCHEMA_NAME(..)
+SELECT ISNULL(
+    (SELECT object.name, object.schema_id, object.object_id, object.type_desc,
+           JSON_QUERY([schema].json) AS [joined_sys_schema],
+           JSON_QUERY([column].json) AS [joined_sys_column],
+           JSON_QUERY([primary_key].json) AS [joined_sys_primary_key]
+    FROM sys.objects object
+           CROSS APPLY (SELECT [column].name, [column].column_id, [column].is_nullable, [column].is_identity, [column].is_computed, [column].user_type_id,
+                               JSON_QUERY([types].json) AS [joined_sys_type],
+                               JSON_QUERY(ISNULL([relationships].json,'[]')) AS [joined_foreign_key_columns]
+                        FROM sys.columns [column]
+                        CROSS APPLY (SELECT name, schema_id, user_type_id FROM sys.types [type]
+                                     WHERE [type].user_type_id = [column].user_type_id
+                                     FOR JSON PATH, WITHOUT_ARRAY_WRAPPER)
+                           AS [types](json)
+                        CROSS APPLY (SELECT fk.*,
+                                            referenced_table.name AS joined_referenced_table_name,
+                                            referenced_column.name AS joined_referenced_column_name,
+                                            JSON_QUERY([schema].json) AS [joined_referenced_sys_schema]
+                                     FROM sys.foreign_key_columns AS [fk],
+                                          sys.columns AS referenced_column,
+                                          sys.objects AS referenced_table
+                                     CROSS APPLY (SELECT [schema].name, [schema].schema_id
+                                                  FROM sys.schemas [schema]
+                                                  WHERE [schema].schema_id = [referenced_table].schema_id
+                                                  FOR JSON PATH, WITHOUT_ARRAY_WRAPPER)
+                                       AS [schema](json)
+                                     WHERE [object].object_id = fk.parent_object_id
+                                       AND [referenced_table].object_id = fk.referenced_object_id
+                                       AND [referenced_column].object_id = [referenced_table].object_id
+                                       AND [referenced_column].column_id = fk.referenced_column_id
+                                       AND [column].column_id = fk.parent_column_id
+                                     FOR JSON PATH)
+                          AS [relationships](json)
+                        WHERE [column].object_id = object.object_id
+                        FOR JSON PATH)
+             AS [column](json)
+           CROSS APPLY (SELECT [schema].name, [schema].schema_id
+                        FROM sys.schemas [schema]
+                        WHERE [schema].schema_id = object.schema_id
+                        FOR JSON PATH, WITHOUT_ARRAY_WRAPPER)
+             AS [schema](json)
+           CROSS APPLY (SELECT pk.name, pk.index_id, JSON_QUERY([cols].json) AS columns
+                          FROM sys.indexes pk
+                               CROSS APPLY (SELECT col.name
+                                              FROM sys.index_columns ic
+                                                   INNER JOIN sys.columns col
+                                                       ON col.column_id = ic.column_id
+                                                       AND col.object_id = ic.object_id
+                                             WHERE ic.object_id = pk.object_id
+                                               AND ic.index_id = pk.index_id
+                                                   FOR JSON PATH)
+                                 AS [cols](json)
+                         WHERE pk.object_id = object.object_id
+                           AND pk.is_primary_key = 1
+                               FOR JSON PATH, WITHOUT_ARRAY_WRAPPER)
+             AS [primary_key](json)
+    WHERE object.type_desc IN ('USER_TABLE', 'VIEW')
+    FOR JSON PATH)
+    , '[]')