0
Da t.id, a.id, t1.name und t2.name, wie füge ich oder t1_has_t2.data aktualisieren?INSERT ON DUPLICATE KEY mit INNER JOIN
Ich kann es aktualisieren, wenn es derzeit einen Datensatz gibt.
UPDATE t1_has_t2
INNER JOIN t1 ON t1.id=t1_has_t2.t1_id
INNER JOIN t2 ON t2.id=t1_has_t2.t2_id
SET t1_has_t2.data=123
WHERE t1.name="foo" AND t1.t_id=333 AND t2.name="bar" AND t2.t_id=333;
Wie kann ich es einfügen, wenn ein Datensatz derzeit nicht existiert?
BEARBEITEN. Wäre es so etwas wie das Folgende? Es scheint eine Verschwendung zu sein, t in das JOIN aufzunehmen.
INSERT INTO t1_has_t2(t1_id,t2_id,data)
SELECT t1.id, t2.id, 123
FROM t
INNER JOIN t1 ON t1.t_id=t.id
INNER JOIN t2 ON t2.t_id=t.id
WHERE t1.name="foo" AND t1.t_id=333 AND t2.name="bar" AND t2.t_id=333
ON DUPLICATE KEY SET t1_has_t2.data=123;
EDIT2. Ah, vielleicht verstehe ich es jetzt. Ich VERBINDET einfach t1 und t2 durch ihre gemeinsame t.id?
INSERT INTO t1_has_t2(t1_id,t2_id,data)
SELECT t1.id, t2.id, 123
FROM t1
INNER JOIN t2 ON t2.t_id=t1.t_id
WHERE t1.name="foo" AND t1.t_id=333 AND t2.name="bar" AND t2.t_id=333
ON DUPLICATE KEY UPDATE t1_has_t2.data=123;
-- MySQL Script generated by MySQL Workbench
-- 08/08/16 07:40:04
-- Model: New Model Version: 1.0
SET @[email protected]@UNIQUE_CHECKS, UNIQUE_CHECKS=0;
SET @[email protected]@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0;
SET @[email protected]@SQL_MODE, SQL_MODE='TRADITIONAL,ALLOW_INVALID_DATES';
-- -----------------------------------------------------
-- Schema mydb
-- -----------------------------------------------------
CREATE SCHEMA IF NOT EXISTS `mydb` DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci ;
USE `mydb` ;
-- -----------------------------------------------------
-- Table `mydb`.`accounts`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `mydb`.`accounts` (
`id` INT NOT NULL AUTO_INCREMENT,
PRIMARY KEY (`id`))
ENGINE = InnoDB;
-- -----------------------------------------------------
-- Table `mydb`.`t`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `mydb`.`t` (
`id` INT NOT NULL AUTO_INCREMENT,
`accounts_id` INT NOT NULL,
PRIMARY KEY (`id`, `accounts_id`),
INDEX `fk_t_accounts_idx` (`accounts_id` ASC),
CONSTRAINT `fk_t_accounts`
FOREIGN KEY (`accounts_id`)
REFERENCES `mydb`.`accounts` (`id`)
ON DELETE NO ACTION
ON UPDATE NO ACTION)
ENGINE = InnoDB;
-- -----------------------------------------------------
-- Table `mydb`.`t1`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `mydb`.`t1` (
`id` INT NOT NULL AUTO_INCREMENT,
`t_id` INT NOT NULL,
`t_accounts_id` INT NOT NULL,
`name` VARCHAR(45) NULL,
PRIMARY KEY (`id`),
INDEX `fk_t1_t1_idx` (`t_id` ASC, `t_accounts_id` ASC),
UNIQUE INDEX `un1` (`t_id` ASC, `name` ASC),
CONSTRAINT `fk_t1_t1`
FOREIGN KEY (`t_id` , `t_accounts_id`)
REFERENCES `mydb`.`t` (`id` , `accounts_id`)
ON DELETE NO ACTION
ON UPDATE NO ACTION)
ENGINE = InnoDB;
-- -----------------------------------------------------
-- Table `mydb`.`t2`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `mydb`.`t2` (
`id` INT NOT NULL AUTO_INCREMENT,
`t_id` INT NOT NULL,
`t_accounts_id` INT NOT NULL,
`name` VARCHAR(45) NULL,
PRIMARY KEY (`id`),
INDEX `fk_t2_t1_idx` (`t_id` ASC, `t_accounts_id` ASC),
UNIQUE INDEX `un2` (`t_id` ASC, `name` ASC),
CONSTRAINT `fk_t2_t1`
FOREIGN KEY (`t_id` , `t_accounts_id`)
REFERENCES `mydb`.`t` (`id` , `accounts_id`)
ON DELETE NO ACTION
ON UPDATE NO ACTION)
ENGINE = InnoDB;
-- -----------------------------------------------------
-- Table `mydb`.`t1_has_t2`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `mydb`.`t1_has_t2` (
`t1_id` INT NOT NULL,
`t2_id` INT NOT NULL,
`data` VARCHAR(45) NULL,
PRIMARY KEY (`t1_id`, `t2_id`),
INDEX `fk_t1_has_t2_t21_idx` (`t2_id` ASC),
INDEX `fk_t1_has_t2_t11_idx` (`t1_id` ASC),
CONSTRAINT `fk_t1_has_t2_t11`
FOREIGN KEY (`t1_id`)
REFERENCES `mydb`.`t1` (`id`)
ON DELETE NO ACTION
ON UPDATE NO ACTION,
CONSTRAINT `fk_t1_has_t2_t21`
FOREIGN KEY (`t2_id`)
REFERENCES `mydb`.`t2` (`id`)
ON DELETE NO ACTION
ON UPDATE NO ACTION)
ENGINE = InnoDB;
SET [email protected]_SQL_MODE;
SET [email protected]_FOREIGN_KEY_CHECKS;
SET [email protected]_UNIQUE_CHECKS;
Könnte besser sein, dies im DB-Administrator-Stream zu fragen http://dba.stackexchange.com/ – alsobubbly
@alsobubbly Nie wirklich sicher, wo man Fragen wie diese post. Beide Seiten scheinen angemessen. – user1032531
Kein Problem, aber dachte, Sie könnten eine bessere Antwort dort erhalten, kein Schaden in Frage hier – alsobubbly