From 9e3b464574de88f5783402cf13fcb7aded340c6b Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Sun, 1 Nov 2026 22:14:48 +0000
Subject: Generate SQL for queries

---
 .../output/generators/sql/SqlGenerator.java        | 28 ++++++++++++++
 .../generators/sqlscripts/SqlScriptsGenerator.java | 44 +++++++++++++++++++---
 2 files changed, 66 insertions(+), 6 deletions(-)

(limited to 'src/main/java')

diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/sql/SqlGenerator.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/sql/SqlGenerator.java
index be847d5..2145373 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/sql/SqlGenerator.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/sql/SqlGenerator.java
@@ -1,5 +1,7 @@
 package org.zwobble.hobgoblin.compiler.output.generators.sql;
 
+import org.zwobble.hobgoblin.compiler.ast.typed.RelationTable;
+import org.zwobble.hobgoblin.compiler.ast.typed.TypedQueryDefinitionNode;
 import org.zwobble.hobgoblin.compiler.ast.typed.TypedTableDefinitionNode;
 import org.zwobble.hobgoblin.compiler.builtins.NativeTypes;
 import org.zwobble.hobgoblin.compiler.output.lang.sql.ast.*;
@@ -50,6 +52,32 @@ public class SqlGenerator {
         }
     }
 
+    public SqlStatement generateQueryDefinition(
+        TypedQueryDefinitionNode queryDefinition,
+        TypesInfo typesInfo
+    ) {
+        switch (queryDefinition.relation()) {
+            case RelationTable relationTable -> {
+                var table = relationTable.table();
+                var schemaInfo = typesInfo.databaseSchemaInfo(table.databaseSchema());
+                var tableInfo = schemaInfo.tables().get(table.name());
+                // TODO: handle singleton struct.
+                var fields = typesInfo.fieldsOf(tableInfo.rowType()).orElseThrow();
+                var columns = fields.stream()
+                    .map(field -> {
+                        var columnName = generateColumnName(field.name());
+                        return new SqlResultColumn(
+                            new SqlRef(columnName),
+                            columnName
+                        );
+                    })
+                    .toList();
+
+                return new SqlSelectStatement(columns, generateTableName(table.name()));
+            }
+        }
+    }
+
     private SqlIdentifier generateColumnName(String fieldName) {
         return new SqlIdentifier(Casing.lowerCamelCaseToSnakeCase(fieldName));
     }
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/sqlscripts/SqlScriptsGenerator.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/sqlscripts/SqlScriptsGenerator.java
index b526e38..f34a629 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/sqlscripts/SqlScriptsGenerator.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/sqlscripts/SqlScriptsGenerator.java
@@ -81,12 +81,33 @@ public class SqlScriptsGenerator implements Generator {
         NamespaceName namespaceName,
         TypesInfo typesInfo
     ) throws IOException {
-        if (namespaceStatement instanceof TypedDatabaseSchemaDefinitionNode databaseSchemaDefinition) {
-            generateDatabaseSchemaDefinition(
-                databaseSchemaDefinition,
-                namespaceName,
-                typesInfo
-            );
+        switch (namespaceStatement) {
+            case TypedDatabaseSchemaDefinitionNode databaseSchemaDefinition ->
+                generateDatabaseSchemaDefinition(
+                    databaseSchemaDefinition,
+                    namespaceName,
+                    typesInfo
+                );
+
+            case TypedEnumDefinitionNode _ -> {
+            }
+
+            case TypedNativeTypeDefinitionNode _ -> {
+            }
+
+            case TypedQueryDefinitionNode queryDefinition -> {
+                generateQueryDefinition(
+                    queryDefinition,
+                    namespaceName,
+                    typesInfo
+                );
+            }
+
+            case TypedStructDefinitionNode _ -> {
+            }
+
+            case TypedSumDefinitionNode _ -> {
+            }
         }
     }
 
@@ -119,6 +140,17 @@ public class SqlScriptsGenerator implements Generator {
         };
     }
 
+    private void generateQueryDefinition(
+        TypedQueryDefinitionNode queryDefinition,
+        NamespaceName namespaceName,
+        TypesInfo typesInfo
+    ) throws IOException {
+        var sqlQuery = this.sqlGenerator.generateQueryDefinition(queryDefinition, typesInfo);
+        var sqlScript = new SqlScript(List.of(sqlQuery));
+
+        write(namespaceName, queryDefinition.name(), sqlScript);
+    }
+
     private void write(
         NamespaceName namespaceName,
         String schemaName,
-- 
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