add init export script

src/lib/data/export-metadata/export-sql-script.ts

@@ -0,0 +1,51 @@
+import { Diagram } from "../domain/diagram";
+
+export const exportSQL = (diagram: Diagram): string => {
+    const { tables, relationships } = diagram;
+
+    if (!tables || tables.length === 0) {
+        return '';
+    }
+
+    // Filter out the tables that are views
+    const nonViewTables = tables.filter(table => !table.isView);
+
+    // Initialize the SQL script string
+    let sqlScript = '';
+
+    // Loop through each non-view table to generate the SQL statements
+    nonViewTables.forEach(table => {
+        sqlScript += `CREATE TABLE ${table.name} (\n`;
+
+        table.fields.forEach((field, index) => {
+            sqlScript += `  ${field.name} ${field.type}`;
+
+            if (field.primaryKey) {
+                sqlScript += ' PRIMARY KEY';
+            }
+
+            if (!field.nullable) {
+                sqlScript += ' NOT NULL';
+            }
+
+            // Add a comma after each field except the last one
+            if (index < table.fields.length - 1) {
+                sqlScript += ',\n';
+            }
+        });
+
+        sqlScript += '\n);\n\n';
+    });
+
+    // Handle relationships (foreign keys) if needed
+    relationships?.forEach(relationship => {
+        const sourceTable = nonViewTables.find(table => table.id === relationship.sourceTableId);
+        const targetTable = nonViewTables.find(table => table.id === relationship.targetTableId);
+
+        if (sourceTable && targetTable) {
+            sqlScript += `ALTER TABLE ${sourceTable.name} ADD CONSTRAINT ${relationship.name} FOREIGN KEY (${relationship.sourceFieldId}) REFERENCES ${targetTable.name} (${relationship.targetFieldId});\n`;
+        }
+    });
+
+    return sqlScript;
+};