SQLite overhaul: custom value, query db command (#5247)

Clean up query errors

crates/nu-command/tests/commands/mod.rs

@@ -39,6 +39,7 @@ mod open;
 mod parse;
 mod path;
 mod prepend;
+mod query;
 mod random;
 mod range;
 mod reduce;

crates/nu-command/tests/commands/open.rs

@@ -109,7 +109,22 @@ fn parses_more_bson_complexity() {
 // ╰───┴──────╯
 
 #[test]
+
 fn parses_sqlite() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            open sample.db
+            | columns
+            | length
+        "#
+    ));
+
+    assert_eq!(actual.out, "3");
+}
+
+#[test]
+fn parses_sqlite_get_column_name() {
     let actual = nu!(
         cwd: "tests/fixtures/formats", pipeline(
         r#"

crates/nu-command/tests/commands/query/db.rs

@@ -0,0 +1,47 @@
+use nu_test_support::{nu, pipeline};
+
+#[test]
+
+fn can_query_single_table() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            open sample.db
+            | query db "select * from strings"
+            | where x =~ ell
+            | length
+        "#
+    ));
+
+    assert_eq!(actual.out, "4");
+}
+
+#[test]
+fn invalid_sql_fails() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            open sample.db
+            | query db "select *asdfasdf"
+        "#
+    ));
+
+    assert!(actual.err.contains("syntax error"));
+}
+
+#[test]
+fn invalid_input_fails() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            "foo" | query db "select * from asdf"
+        "#
+    ));
+
+    assert!(actual.err.contains("pipeline_mismatch"));
+}
+
+#[test]
+fn scratch() {
+    assert!(true);
+}

crates/nu-command/tests/commands/query/mod.rs

@@ -0,0 +1 @@
+mod db;