From 20fbc74d57528148d85cf368d2ee0cd06e9489ef Mon Sep 17 00:00:00 2001
From: Pranay Pandey <pranaypandeyofficial@gmail.com>
Date: Mon, 6 Oct 2025 23:49:34 +0530
Subject: [PATCH] Add "IF NOT EXISTS" clause in MySQL and PostgreSQL export

---
 src/utils/exportSQL/generic.js  | 4 ++--
 src/utils/exportSQL/mysql.js    | 2 +-
 src/utils/exportSQL/postgres.js | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/utils/exportSQL/generic.js b/src/utils/exportSQL/generic.js
index e9d576378..04d220839 100644
--- a/src/utils/exportSQL/generic.js
+++ b/src/utils/exportSQL/generic.js
@@ -187,7 +187,7 @@ export function jsonToMySQL(obj) {
   return `${obj.tables
     .map(
       (table) =>
-        `CREATE TABLE \`${table.name}\` (\n${table.fields
+        `CREATE TABLE IF NOT EXISTS \`${table.name}\` (\n${table.fields
           .map(
             (field) =>
               `\t\`${
@@ -294,7 +294,7 @@ export function jsonToPostgreSQL(obj) {
                 )
                 .join("\n")}\n`
             : ""
-        }CREATE TABLE "${table.name}" (\n${table.fields
+        }CREATE TABLE IF NOT EXISTS "${table.name}" (\n${table.fields
           .map(
             (field) =>
               `${field.comment === "" ? "" : `\t-- ${field.comment}\n`}\t"${
diff --git a/src/utils/exportSQL/mysql.js b/src/utils/exportSQL/mysql.js
index a835778e3..f35dbda3f 100644
--- a/src/utils/exportSQL/mysql.js
+++ b/src/utils/exportSQL/mysql.js
@@ -24,7 +24,7 @@ export function toMySQL(diagram) {
   return `${diagram.tables
     .map(
       (table) =>
-        `CREATE TABLE \`${table.name}\` (\n${table.fields
+        `CREATE TABLE IF NOT EXISTS \`${table.name}\` (\n${table.fields
           .map(
             (field) =>
               `\t\`${field.name}\` ${parseType(field)}${
diff --git a/src/utils/exportSQL/postgres.js b/src/utils/exportSQL/postgres.js
index 49b468345..3dc6c0e13 100644
--- a/src/utils/exportSQL/postgres.js
+++ b/src/utils/exportSQL/postgres.js
@@ -81,7 +81,7 @@ export function toPostgres(diagram) {
         )
         .join("\n");
 
-      return `CREATE TABLE "${table.name}" (\n${fieldDefinitions}${primaryKeyClause}${inheritsClause};\n\n${commentStatements}\n${indexStatements}`;
+      return `CREATE TABLE IF NOT EXISTS "${table.name}" (\n${fieldDefinitions}${primaryKeyClause}${inheritsClause};\n\n${commentStatements}\n${indexStatements}`;
     })
     .join("\n\n");