From aa2262cdd2cfcdeddac1e378d861d5771946041b Mon Sep 17 00:00:00 2001
From: piyongcai <Pyc@371226@>
Date: Thu, 26 May 2022 10:56:32 +0800
Subject: [PATCH 1/3] FIX DataType Defind

1. because select schema from db, return int2,int4,int8. but code name is smallint,integer,bigint. it will cause alter column.
 a. smallint -> int2
 b. integer -> int4
 c. bigint -> int8
2. in postgresql, set timestamptz Precision == 0, This means being accurate to the seconds.
---
 postgres.go | 19 ++++++++-----------
 1 file changed, 8 insertions(+), 11 deletions(-)

diff --git a/postgres.go b/postgres.go
index c0fdea0..2a9ab86 100644
--- a/postgres.go
+++ b/postgres.go
@@ -6,7 +6,6 @@ import (
 	"regexp"
 	"strconv"
 
-	"github.com/jackc/pgx/v4"
 	"github.com/jackc/pgx/v4/stdlib"
 	"gorm.io/gorm"
 	"gorm.io/gorm/callbacks"
@@ -165,11 +164,11 @@ func (dialector Dialector) DataTypeOf(field *schema.Field) string {
 		} else {
 			switch {
 			case size <= 16:
-				return "smallint"
+				return "int2"
 			case size <= 32:
-				return "integer"
+				return "int4"
 			default:
-				return "bigint"
+				return "int8"
 			}
 		}
 	case schema.Float:
@@ -186,10 +185,8 @@ func (dialector Dialector) DataTypeOf(field *schema.Field) string {
 		}
 		return "text"
 	case schema.Time:
-		if field.Precision > 0 {
-			return fmt.Sprintf("timestamptz(%d)", field.Precision)
-		}
-		return "timestamptz"
+		// in postgresql, Precision == 0, This means being accurate to the seconds.
+		return fmt.Sprintf("timestamptz(%d)", field.Precision)
 	case schema.Bytes:
 		return "bytea"
 	}
@@ -210,11 +207,11 @@ func (dialectopr Dialector) RollbackTo(tx *gorm.DB, name string) error {
 func getSerialDatabaseType(s string) (dbType string, ok bool) {
 	switch s {
 	case "smallserial":
-		return "smallint", true
+		return "int2", true
 	case "serial":
-		return "integer", true
+		return "int4", true
 	case "bigserial":
-		return "bigint", true
+		return "int8", true
 	default:
 		return "", false
 	}

From 22be74d0d099c1197035876aed99d0cc40af5478 Mon Sep 17 00:00:00 2001
From: piyongcai <Pyc@371226@>
Date: Thu, 26 May 2022 10:58:57 +0800
Subject: [PATCH 2/3] recover import

---
 postgres.go | 1 +
 1 file changed, 1 insertion(+)

diff --git a/postgres.go b/postgres.go
index 2a9ab86..72ecad8 100644
--- a/postgres.go
+++ b/postgres.go
@@ -6,6 +6,7 @@ import (
 	"regexp"
 	"strconv"
 
+	"github.com/jackc/pgx/v4"
 	"github.com/jackc/pgx/v4/stdlib"
 	"gorm.io/gorm"
 	"gorm.io/gorm/callbacks"

From c39b6867f39bf56739ec8cd9b6d3a1f862266633 Mon Sep 17 00:00:00 2001
From: piyongcai <piyongcai@163.com>
Date: Tue, 31 May 2022 14:39:18 +0800
Subject: [PATCH 3/3] fix timestamptz precision range in [0, 6]

---
 postgres.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/postgres.go b/postgres.go
index 72ecad8..7c59701 100644
--- a/postgres.go
+++ b/postgres.go
@@ -187,7 +187,10 @@ func (dialector Dialector) DataTypeOf(field *schema.Field) string {
 		return "text"
 	case schema.Time:
 		// in postgresql, Precision == 0, This means being accurate to the seconds.
-		return fmt.Sprintf("timestamptz(%d)", field.Precision)
+		if field.Precision >= 0 && field.Precision <= 6 {
+			return fmt.Sprintf("timestamptz(%d)", field.Precision)
+		}
+		return "timestamptz"
 	case schema.Bytes:
 		return "bytea"
 	}