Solution to execute batch mysql statements in PHP_PHP tutorial

When there are multiple mysql statements that need to be executed, such as

$sqls= “insert table a values(1,2); insert table a values(2,3);”

If you need to execute it, there are three methods that can be used in php:

mysql_query

pdo

mysqli

Three methods are available when there is no problem with the sqls statement.

But

Problems will occur when the sql statement is wrong
The first sql error: all three methods return false

The first sql is correct, the second sql is wrong: mysql_query, pdo, mysqli:query also return true. So At this time, you cannot judge whether the statement in your sqls is wrong.

There are several ways to solve this problem:

1 Parse sql statement
Split each sql statement for execution. This solves the problem of executing each statement separately. But this method has several more methods, so it is not advisable.

2 Save the sqls statement as text
Use cmd to execute the command mysql…. .< sqls.sql, and then capture the output. This is also a method, but it feels like it's going around the problem. There should be a better way.

3 Use the mysqli::multi_query method
This method can execute multiple sql statements, then use mysqli::next_result to set the sql offset, and use mysqli::error to get the current offset Error status of moved sql

The following is the sample code for the third method

The code is as follows:

Copy codeThe code is as follows:

$sql = Config::get('sql') ;
$content = file_get_contents($sql);
$config = Config::get('config')
$mysqli = mysqli_connect($config['host'], $config['user' ], $config['password'], $config['dbname']);
$ret = $mysqli->multi_query($content);
if($ret === false) {
echo mysqli_error($mysqli);
}
while (mysqli_more_results($mysqli)) {
if (mysqli_next_result($mysqli) === false) {
echo mysqli_error($mysqli) ;
echo "rn";
break;
}
}
$mysqli->close(); If there is an error in one line, the program will jump out of this error.
This is very useful if you want to write a script to initialize mysql.

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