MySql : 값이있는 경우 UPDATE INSERT

Question

이 코드는 다음과 같습니다. 테이블에 자동 증가 필드가 있습니다 (다른 테이블에서 사용됨). 이 코드를 단순화하고 최적화하고 싶습니다.

$query ="SELECT * FROM models WHERE col1 = 'foo'"; 
$testResult = mysql_query($query) or die('Error, query failed');  

if(mysql_fetch_array($testResult) == NULL){ 
    //insert... 
    $query ="INSERT INTO models (col1, col2, col3) 
    VALUES ('foo', 'bar', 'alph')"; 
    $result = mysql_query($query) or die('Error, query failed'); 
}else{ 
    //update... 
    $query = "UPDATE models 
     SET col1='foo', col2='bar', col3='alph' 
     WHERE col1='foo' AND col2='bar'"; 
     $result = mysql_query($query) or die('Error, query failed');   
} 

편집 : 기본 키 ID는 자동으로 증가되는 필드입니다. 나는 이것을 바꾸고 싶지 않다. 그러나 다른 필드가 중복되면이 레코드를 업데이트하려고합니다.

Answer 1

방법에 대한 다음 장소로 대체 ​​:

REPLACE INTO models 
(col1, col2, col3) 
VALUES 
('foo', 'bar', 'alpha') 

col1이 기본 키라고 가정하고 'foo'값이있는 행이 이미 있으면 다른 두 열을 업데이트합니다. 그렇지 않으면 새로운 행이 삽입됩니다.

Answer 2

는 "DUPLICATE KEY UPDATE ON ... INSERT"를 사용하려고 할 수 있습니다 구문

http://dev.mysql.com/doc/refman/5.0/en/insert-on-duplicate.html

If you specify ON DUPLICATE KEY UPDATE, and a row is inserted that would cause a duplicate value in a UNIQUE index or PRIMARY KEY, an UPDATE of the old row is performed. For example, if column a is declared as UNIQUE and contains the value 1, the following two statements have identical effect: 

INSERT INTO table (a,b,c) VALUES (1,2,3) 
    ON DUPLICATE KEY UPDATE c=c+1; 

UPDATE table SET c=c+1 WHERE a=1; 
The ON DUPLICATE KEY UPDATE clause can contain multiple column assignments, separated by commas. 

With ON DUPLICATE KEY UPDATE, the affected-rows value per row is 1 if the row is inserted as a new row and 2 if an existing row is updated. 

If column b is also unique, the INSERT is equivalent to this UPDATE statement instead: 

UPDATE table SET c=c+1 WHERE a=1 OR b=2 LIMIT 1; 
If a=1 OR b=2 matches several rows, only one row is updated. In general, you should try to avoid using an ON DUPLICATE KEY clause on tables with multiple unique indexes. 

You can use the VALUES(col_name) function in the UPDATE clause to refer to column values from the INSERT portion of the INSERT ... UPDATE statement. In other words, VALUES(col_name) in the UPDATE clause refers to the value of col_name that would be inserted, had no duplicate-key conflict occurred. This function is especially useful in multiple-row inserts. The VALUES() function is meaningful only in INSERT ... UPDATE statements and returns NULL otherwise. Example: 

INSERT INTO table (a,b,c) VALUES (1,2,3),(4,5,6) 
    ON DUPLICATE KEY UPDATE c=VALUES(a)+VALUES(b); 
That statement is identical to the following two statements: 

INSERT INTO table (a,b,c) VALUES (1,2,3) 
    ON DUPLICATE KEY UPDATE c=3; 
INSERT INTO table (a,b,c) VALUES (4,5,6) 
    ON DUPLICATE KEY UPDATE c=9; 
If a table contains an AUTO_INCREMENT column and INSERT ... UPDATE inserts a row, the LAST_INSERT_ID() function returns the AUTO_INCREMENT value. If the statement updates a row instead, LAST_INSERT_ID() is not meaningful. However, you can work around this by using LAST_INSERT_ID(expr). Suppose that id is the AUTO_INCREMENT column. To make LAST_INSERT_ID() meaningful for updates, insert rows as follows: 

INSERT INTO table (a,b,c) VALUES (1,2,3) 
    ON DUPLICATE KEY UPDATE id=LAST_INSERT_ID(id), c=3; 
The DELAYED option is ignored when you use ON DUPLICATE KEY UPDATE. 

Answer 3

5.0 + 사용을 위해 : INSERT ON DUPLICATE KEY UPDATE

http://dev.mysql.com/doc/refman/5.0/en/insert-on-duplicate.html

Answer 4

중복으로 col3 만 업데이트하면됩니다. 이것은 정확히 당신이 요구하는 것입니다.

INSERT INTO models (col1, col2, col3) 
VALUES ('foo', 'bar', 'alpha') 
ON DUPLICATE KEY UPDATE col3='alpha';