dolphin: Implement delete (#624)

Author: kyleconroy

internal/endtoend/testdata/delete_from/mysql/go/db.go

@@ -0,0 +1,4 @@
+CREATE TABLE foo (id text not null);
+
+/* name: DeleteFrom :exec */
+DELETE FROM foo WHERE id = ?;

internal/endtoend/testdata/delete_from/mysql/go/models.go

@@ -0,0 +1,12 @@
+{
+  "version": "1",
+  "packages": [
+    {
+      "engine": "_dolphin",
+      "path": "go",
+      "name": "querytest",
+      "schema": "query.sql",
+      "queries": "query.sql"
+    }
+  ]
+}

internal/endtoend/testdata/delete_from/mysql/go/query.sql.go

@@ -0,0 +1,4 @@
+CREATE TABLE foo (id text not null);
+
+-- name: DeleteFrom :exec
+DELETE FROM foo WHERE id = $1;

internal/endtoend/testdata/delete_from/mysql/query.sql

@@ -0,0 +1,12 @@
+{
+  "version": "1",
+  "packages": [
+    {
+      "engine": "postgresql",
+      "path": "go",
+      "name": "querytest",
+      "schema": "query.sql",
+      "queries": "query.sql"
+    }
+  ]
+}