Question

我想获取当前值，即ID号。对于我的表，ID具有Auto_increment选项，我想获取ID值。在Oracle中，就像这样：

    INSERT INTO mvc_board(bName, bTitle, bContent, bHit, bGroup, bStep,
bIndent) 
VALUES('abcd', 'is title', 'is content', 0, mvc_board_seq.currval, 0, 0);

但是，我正在使用MariaDB，所以我使用了以下查询：

INSERT INTO mvc_board (bName, bTitle, bContent, bHit, bGroup, bStep, bIndent)
VALUES ('pat', 'is title', 'is content', 0, SELECT MAX(bId) FROM mvc_board, 0, 0);

但是，这有语法错误。我该如何解决？

Answer 1

INSERT INTO mvc_board (bName, bTitle, bContent, bHit, bGroup, bStep, bIndent)
SELECT 'pat', 'is title', 'is content', 0, MAX(bId), 0, 0 FROM mvc_board

Answer 2

这将使用mysql会话变量。首先将最大ID存储在@last_insert_id中，然后在查询中使用它。希望对您有所帮助。

SET @last_insert_id := 0;

SELECT @last_insert_id := MAX(bId) FROM mvc_board;


INSERT INTO mvc_board (bName, bTitle, bContent, bHit, bGroup, bStep, bIndent)
VALUES ('pat', 'is title', 'is content', 0, @last_insert_id, 0, 0);

Answer 3

下一个auto_increment值在INFORMATION_SCHEMA中可用：

INSERT INTO mvc_board (bName, bTitle, bContent, bHit, bGroup, bStep, bIndent)
SELECT 'pat', 'is title', 'is content', 0, AUTO_INCREMENT, 0, 0 
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_SCHEMA = database() AND TABLE_NAME = 'mvc_board';

我如何获得MariaDB的当前价值？

3 个答案: