test: cover ReturningTest and run
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package kestrel
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import kestrel.catalog.Catalog
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import kestrel.engine.DeleteResult
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import kestrel.engine.Executor
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import kestrel.engine.InsertResult
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import kestrel.engine.SelectResult
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import kestrel.engine.StatementResult
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import kestrel.engine.UpdateResult
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import kestrel.storage.Value
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import kestrel.sql.lexer.Lexer
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import kestrel.sql.parser.Parser
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import kotlin.test.Test
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import kotlin.test.assertEquals
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import kotlin.test.assertFailsWith
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import kotlin.test.assertNull
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class ReturningTest {
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private val catalog = Catalog()
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private val executor = Executor(catalog)
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private fun run(sql: String): List<StatementResult> =
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Parser(Lexer(sql).tokenize()).parseProgram().map { executor.execute(it) }
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private fun exec(sql: String): StatementResult = run(sql).single()
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private fun select(sql: String): SelectResult = exec(sql) as SelectResult
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private fun int(value: Long) = Value.IntegerValue(value)
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private fun text(value: String) = Value.TextValue(value)
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private fun seed() {
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run("CREATE TABLE accounts (id INTEGER PRIMARY KEY, name TEXT NOT NULL, balance INTEGER NOT NULL)")
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run("INSERT INTO accounts VALUES (1, 'ada', 100)")
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}
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@Test
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fun insertReturningStarReportsTheFullInsertedRow() {
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seed()
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val result = exec("INSERT INTO accounts VALUES (2, 'linus', 200) RETURNING *") as InsertResult
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assertEquals(1, result.count)
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assertEquals(listOf("id", "name", "balance"), result.returning!!.columns)
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assertEquals(listOf(listOf(int(2), text("linus"), int(200))), result.returning!!.rows)
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}
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@Test
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fun insertReturningExpressionListWithAliasProjectsAndLabels() {
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seed()
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val result = exec("INSERT INTO accounts VALUES (2, 'linus', 200) RETURNING id, balance * 2 AS doubled") as InsertResult
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assertEquals(listOf("id", "doubled"), result.returning!!.columns)
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assertEquals(listOf(listOf(int(2), int(400))), result.returning!!.rows)
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}
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@Test
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fun multiRowInsertReturningReportsOneRowPerInsertedRowInOrder() {
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run("CREATE TABLE t (id INTEGER PRIMARY KEY, tag TEXT NOT NULL)")
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val result = exec("INSERT INTO t VALUES (1, 'a'), (2, 'b'), (3, 'c') RETURNING id") as InsertResult
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assertEquals(listOf(listOf(int(1)), listOf(int(2)), listOf(int(3))), result.returning!!.rows)
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}
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@Test
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fun insertWithoutReturningLeavesReturningNull() {
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seed()
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val result = exec("INSERT INTO accounts VALUES (2, 'linus', 200)") as InsertResult
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assertNull(result.returning)
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}
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@Test
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fun onConflictDoNothingContributesNoRowToReturning() {
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seed()
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val result = exec(
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"INSERT INTO accounts VALUES (1, 'ignored', 999) ON CONFLICT (id) DO NOTHING RETURNING *"
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) as InsertResult
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assertEquals(0, result.count)
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assertEquals(emptyList(), result.returning!!.rows)
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}
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@Test
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fun onConflictDoUpdateReturnsThePostUpdateRowNotTheProposedOne() {
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seed()
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val result = exec(
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"INSERT INTO accounts VALUES (1, 'ada', 50) ON CONFLICT (id) DO UPDATE SET balance = accounts.balance + excluded.balance RETURNING balance"
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) as InsertResult
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assertEquals(1, result.count)
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assertEquals(listOf(listOf(int(150))), result.returning!!.rows)
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}
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@Test
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fun onConflictDoUpdateWithFailingWhereContributesNoRowToReturning() {
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seed()
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val result = exec(
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"INSERT INTO accounts VALUES (1, 'ada', 999) ON CONFLICT (id) DO UPDATE SET balance = 999 WHERE excluded.balance < 0 RETURNING *"
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) as InsertResult
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assertEquals(0, result.count)
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assertEquals(emptyList(), result.returning!!.rows)
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}
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@Test
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fun mixedConflictAndFreshRowsInOneStatementReturnBothKinds() {
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seed()
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val result = exec(
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"INSERT INTO accounts VALUES (1, 'ada', 5), (2, 'linus', 200) " +
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"ON CONFLICT (id) DO UPDATE SET balance = accounts.balance + excluded.balance RETURNING id, balance"
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) as InsertResult
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assertEquals(
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listOf(listOf(int(1), int(105)), listOf(int(2), int(200))),
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result.returning!!.rows
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)
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}
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@Test
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fun updateReturningReportsThePostUpdateValuesForEveryMatchedRow() {
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seed()
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run("INSERT INTO accounts VALUES (2, 'linus', 200)")
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val result = exec("UPDATE accounts SET balance = balance + 10 RETURNING id, balance") as UpdateResult
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assertEquals(2, result.count)
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assertEquals(listOf(listOf(int(1), int(110)), listOf(int(2), int(210))), result.returning!!.rows)
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}
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@Test
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fun updateReturningWithWhereOnlyReportsMatchedRows() {
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seed()
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run("INSERT INTO accounts VALUES (2, 'linus', 200)")
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val result = exec("UPDATE accounts SET balance = 0 WHERE id = 2 RETURNING id") as UpdateResult
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assertEquals(listOf(listOf(int(2))), result.returning!!.rows)
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}
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@Test
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fun updateReturningWithNoMatchesReturnsAnEmptyResultNotNull() {
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seed()
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val result = exec("UPDATE accounts SET balance = 0 WHERE id = 999 RETURNING id") as UpdateResult
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assertEquals(0, result.count)
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assertEquals(emptyList(), result.returning!!.rows)
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}
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@Test
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fun deleteReturningReportsThePreDeletionRowValues() {
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seed()
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run("INSERT INTO accounts VALUES (2, 'linus', 200)")
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val result = exec("DELETE FROM accounts WHERE id = 1 RETURNING *") as DeleteResult
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assertEquals(1, result.count)
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assertEquals(listOf(listOf(int(1), text("ada"), int(100))), result.returning!!.rows)
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assertEquals(1, select("SELECT * FROM accounts").rows.size)
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}
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@Test
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fun deleteReturningWithNoWhereReturnsEveryDeletedRow() {
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seed()
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run("INSERT INTO accounts VALUES (2, 'linus', 200)")
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val result = exec("DELETE FROM accounts RETURNING id") as DeleteResult
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assertEquals(listOf(listOf(int(1)), listOf(int(2))), result.returning!!.rows)
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}
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@Test
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fun returningRejectsAnUnknownColumnEvenWhenZeroRowsMatch() {
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seed()
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assertFailsWith<KestrelException> {
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exec("UPDATE accounts SET balance = 0 WHERE id = 999 RETURNING nope")
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}
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}
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@Test
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fun returningRejectsAnAggregateFunction() {
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seed()
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assertFailsWith<KestrelException> {
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exec("DELETE FROM accounts WHERE id = 1 RETURNING COUNT(*)")
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}
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}
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@Test
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fun returningIsRejectedInsideATriggerBodyStatement() {
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run("CREATE TABLE orders (id INTEGER PRIMARY KEY, amount INTEGER)")
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run("CREATE TABLE audit (order_id INTEGER)")
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assertFailsWith<KestrelException> {
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run(
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"CREATE TRIGGER log_insert AFTER INSERT ON orders FOR EACH ROW " +
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"BEGIN INSERT INTO audit VALUES (NEW.id) RETURNING order_id; END"
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)
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}
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}
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@Test
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fun aTableWithATriggerStillHonoursReturningOnTheOutermostStatement() {
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run("CREATE TABLE orders (id INTEGER PRIMARY KEY, amount INTEGER)")
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run("CREATE TABLE audit (order_id INTEGER)")
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run(
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"CREATE TRIGGER log_insert AFTER INSERT ON orders FOR EACH ROW " +
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"BEGIN INSERT INTO audit VALUES (NEW.id); END"
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)
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val result = exec("INSERT INTO orders VALUES (1, 100) RETURNING id, amount") as InsertResult
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assertEquals(listOf(listOf(int(1), int(100))), result.returning!!.rows)
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assertEquals(listOf(listOf(int(1))), select("SELECT order_id FROM audit").rows)
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}
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}
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