回答編集履歴
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ほかの方法を追記
answer
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@@ -5,6 +5,21 @@
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SQLを2回発行することになりますがDELETE/INSERTされてはいかがでしょう?
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```SQL
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-
DELETE FROM users WHERE email=?
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8
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DELETE FROM users WHERE email=?;
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INSERT INTO users(email,password,entryday) VALUES ( ? , ? , NOW() );
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```
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あとはUPDATE文とINSERT文を条件分岐しないで2回実行してしまうとか
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```SQL
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UPDATE users
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SET password = ?
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WHERE email = ?
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;
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INSERT INTO users
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(email,password,entryday)
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SELECT ? AS email, ? AS password, NOW() AS entryday
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WHERE NOT EXISTS(
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SELECT 1 FROM users WHERE email = ?
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)
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```
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