From 46ed0688f61bac79f20651e3ca6a4c358a7e7b6a Mon Sep 17 00:00:00 2001 From: linbaozhong Date: Wed, 1 Dec 2021 12:13:26 +0800 Subject: [PATCH] =?UTF-8?q?exist=E6=96=B9=E6=B3=95sql=E8=AF=AD=E5=8F=A5?= =?UTF-8?q?=E4=BC=98=E5=8C=96?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 本地没有mssql和oracle，所以没法测试，但是，mysql 使用select 1 from TABLENAME where CONDITION limit 1可能更好 --- internal/statements/query.go | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/internal/statements/query.go b/internal/statements/query.go index c1ff8833..dd38a9a2 100644 --- a/internal/statements/query.go +++ b/internal/statements/query.go @@ -392,7 +392,7 @@ func (statement *Statement) GenExistSQL(bean ...interface{}) (string, []interfac } else if statement.dialect.URI().DBType == schemas.ORACLE { sqlStr = fmt.Sprintf("SELECT * FROM %s WHERE (%s) %s AND ROWNUM=1", tableName, joinStr, condSQL) } else { - sqlStr = fmt.Sprintf("SELECT * FROM %s %s WHERE %s LIMIT 1", tableName, joinStr, condSQL) + sqlStr = fmt.Sprintf("SELECT 1 FROM %s %s WHERE %s LIMIT 1", tableName, joinStr, condSQL) } args = condArgs } else { @@ -401,7 +401,7 @@ func (statement *Statement) GenExistSQL(bean ...interface{}) (string, []interfac } else if statement.dialect.URI().DBType == schemas.ORACLE { sqlStr = fmt.Sprintf("SELECT * FROM %s %s WHERE ROWNUM=1", tableName, joinStr) } else { - sqlStr = fmt.Sprintf("SELECT * FROM %s %s LIMIT 1", tableName, joinStr) + sqlStr = fmt.Sprintf("SELECT 1 FROM %s %s LIMIT 1", tableName, joinStr) } args = []interface{}{} }