From 40d0c52d8b0c8362f8eac63cacd4628c76198541 Mon Sep 17 00:00:00 2001
From: thinkgos <thinkgo@aliyun.com>
Date: Thu, 3 Aug 2023 10:36:14 +0800
Subject: [PATCH] fix:: fix default value

---
 driver/mysql/sql_test.go | 26 +++++++++++++-------------
 driver/mysql/sql_tidb.go | 10 +++++++---
 2 files changed, 20 insertions(+), 16 deletions(-)

diff --git a/driver/mysql/sql_test.go b/driver/mysql/sql_test.go
index caf4770..4174ef2 100644
--- a/driver/mysql/sql_test.go
+++ b/driver/mysql/sql_test.go
@@ -11,19 +11,19 @@ import (
 func Test_Tidb_SQL_Parse(t *testing.T) {
 	sql :=
 		"CREATE TABLE `announce` (" +
-			"`id` bigint NOT NULL AUTO_INCREMENT DEFAULT 'abc' COMMENT '主键'," +
-			"`title` varchar(255) NOT NULL COMMENT '标题'," +
-			"`content` varchar(2048) NOT NULL DEFAULT '{}' COMMENT '内容'," +
-			"`value1` float unsigned NOT NULL DEFAULT '1' COMMENT '值1'," +
-			"`value2` float(10,1) unsigned NOT NULL DEFAULT '2' COMMENT '值2'," +
-			"`value2` double(16,2) NOT NULL DEFAULT '3' COMMENT '值3'," +
-			"`value3` enum('00','SH') NOT NULL DEFAULT '4' COMMENT '值4'," +
-			"`created_at` datetime NOT NULL COMMENT '发布时间'," +
-			"`updated_at` datetime NOT NULL," +
-			"`deleted_at` bigint NOT NULL DEFAULT '0'," +
-			"PRIMARY KEY (`id`) USING BTREE," +
-			"KEY `uk_value1_value2` (`value1`,`value2`) USING BTREE," +
-			"CONSTRAINT `posts_ibfk_1` FOREIGN KEY (`value1`) REFERENCES `user` (`id`) ON DELETE RESTRICT ON UPDATE RESTRICT" +
+			"`id` bigint NOT NULL AUTO_INCREMENT DEFAULT '111' COMMENT '主键'," +
+			"`title` varchar(255) DEFAULT NULL COMMENT '标题'" +
+			// "`content` varchar(2048) NOT NULL DEFAULT '{}' COMMENT '内容'," +
+			// "`value1` float unsigned NOT NULL DEFAULT '1' COMMENT '值1'," +
+			// "`value2` float(10,1) unsigned NOT NULL DEFAULT '2' COMMENT '值2'," +
+			// "`value2` double(16,2) NOT NULL DEFAULT '3' COMMENT '值3'," +
+			// "`value3` enum('00','SH') NOT NULL DEFAULT '4' COMMENT '值4'," +
+			// "`created_at` datetime NOT NULL COMMENT '发布时间'," +
+			// "`updated_at` datetime NOT NULL," +
+			// "`deleted_at` bigint NOT NULL DEFAULT '0'," +
+			// "PRIMARY KEY (`id`) USING BTREE," +
+			// "KEY `uk_value1_value2` (`value1`,`value2`) USING BTREE," +
+			// "CONSTRAINT `posts_ibfk_1` FOREIGN KEY (`value1`) REFERENCES `user` (`id`) ON DELETE RESTRICT ON UPDATE RESTRICT" +
 			")ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci COMMENT='公告-面向所有人的消息';"
 
 	d := &SQLTidb{
diff --git a/driver/mysql/sql_tidb.go b/driver/mysql/sql_tidb.go
index 8082a1e..221c31a 100644
--- a/driver/mysql/sql_tidb.go
+++ b/driver/mysql/sql_tidb.go
@@ -102,9 +102,13 @@ func parserCreateTableStmtColumn(col *ast.ColumnDef) (*schema.Column, error) {
 		case ast.ColumnOptionAutoIncrement:
 			coldef.AddAttrs(&mysql.AutoIncrement{})
 		case ast.ColumnOptionDefaultValue:
-			coldef.Default = &schema.Literal{V: formatExprNode(opt.Expr)}
+			val := formatExprNode(opt.Expr)
+			if !strings.EqualFold(val, "null") {
+				coldef.Default = &schema.Literal{V: strings.Trim(formatExprNode(opt.Expr), `"`)}
+			}
+
 		case ast.ColumnOptionComment:
-			coldef.AddAttrs(&schema.Comment{Text: formatExprNode(opt.Expr)})
+			coldef.AddAttrs(&schema.Comment{Text: strings.Trim(formatExprNode(opt.Expr), `"`)})
 		}
 	}
 
@@ -338,5 +342,5 @@ func formatExprNode(e ast.ExprNode) string {
 	}
 	b := &strings.Builder{}
 	e.Format(b)
-	return strings.Trim(b.String(), `"`)
+	return b.String()
 }