MYSQLI 连接数据库

陈凯qph3nc [沧桑] 2013-04-14 20:41:31 星期日晴天查看:399 回复:0 发消息给作者

MYSQLI 连接数据库

$mysqli = new mysqli("localhost", "root", "secret", "test");
if (mysqli_connect_errno( )) {
   printf("Connect failed: %s ", mysqli_connect_error( ));
   exit ( );
} else {
   printf("Connect succeeded ");
}
?>

错误检查

1)
    if ($mysqli->query($sql) TRUE) {
         printf("Statement failed %d: (%s) %s " ,$mysqli->errno,$mysqli->sqlstate,$mysqli->error);
   }
?>
2)
    $mysqli->query($sql) or printf("Statement failed %d: (%s) %s " ,$mysqli->errno,$mysqli->sqlstate,$mysqli->error);
?>
3)
   $mysqli->query($sql);
   if ($mysqli->errno 0 ) {
           printf("Statement failed %d: (%s) %s " ,$mysqli->errno,$mysqli->sqlstate,$mysqli->error);
   }
?>

简单无返回查询

$mysqli->query("CREATE TABLE guy_1 (guys_integers INT)");
if ($mysqli->errno 0 ) {
printf("Statement failed %d: (%s) %s " ,$mysqli->errno,$mysqli->sqlstate,$mysqli->error);
}
?>

返回结果集fetch_object

$sql="SELECT employee_id, surname, salary FROM employees WHERE salary>95000 AND department_id=1 AND status='G'";
$results=$mysqli->query($sql);
if ($mysqli->errno) { die ($mysqli->errno." ".$mysqli->error); }
while($row=$results->fetch_object( )) {
printf("%d %s %d ",$row->employee_id,$row->surname,$row->salary);
}
?>

使用fetch_row返回结果集

$sql="SELECT employee_id, surname, salary FROM employees WHERE salary>95000 AND department_id=1 AND status='G'";
$results=$mysqli->query($sql);
if ($mysqli->errno) { die ($mysqli->errno." ".$mysqli->error); }
while($row=$results->fetch_row( )) {
printf("%d %s %d ",$row[0],$row[1],$row[2]);
}
?>

事务管理

$mysqli->autocommit(FALSE);
$mysqli->query("UPDATE account_balance SET balance=balance-$tfer_amount WHERE account_id=$from_account");
if ($mysqli->errno)   {
printf("transaction aborted: %s ",$mysqli->error);
$mysqli->rollback( );
}
else   {
$mysqli->query("UPDATE account_balance SET balance=balance+$tfer_amount WHERE account_id=$to_account");
if ($mysqli->errno) {
     printf("transaction aborted: %s ",$mysqli->error);
     $mysqli->rollback( );
}
else      {
     printf("transaction succeeded ");
     $mysqli->commit( );
}
}
?>

prepare语句

$insert_stmt=$mysqli->prepare("INSERT INTO x VALUES(?,?)") or die($mysqli->error);
$insert_stmt->bind_param("is", $my_number,$my_string); #i=integer
for ($my_number = 1; $my_number execute( ) or die ($insert_stmt->error);
}
$insert_stmt->close( );
?>

从prepared语句中返回结果集

$sql="SELECT employee_id,surname,firstname FROM employees WHERE department_id=? AND status=? IMIT 5";
$stmt = $mysqli->prepare($sql);
if ($mysqli->errno0) {die($mysqli->errno.": ".$mysqli->error);}
$stmt->bind_param("is",$input_department_id,$input_status) or die($stmt-error);
$stmt->bind_result( $employee_id,$surname,$firstname) or die($stmt->error);
$input_department_id=1;
$input_status='G';
$stmt->execute( );
if ($mysqli->errno0) {die($stmt.errno.": ".$stmt->error) ;}
while ($stmt->fetch( )) {
printf("%s %s %s ", $employee_id,$surname,$firstname);
}
?>

获得 Metadata结果集

$metadata = $stmt->result_metadata( );
$field_cnt = $metadata->field_count;
while ($colinfo = $metadata->fetch_field( )) {
printf("Column:   %s ",   $colinfo->name);
printf("max. Len: %d ",   $colinfo->max_length);
printf("Type:     %d ", $colinfo->type);
}
?>

调用无结果集的存储过程

$sql = 'call simple_stored_proc( )';
$mysqli->query($sql);
if ($mysqli->errno) {
die("Execution failed: ".$mysqli->errno.": ".$mysqli->error);
}
else {
printf("Stored procedure execution succeeded ");
}
?>

返回单个结果集的存储过程

CREATE PROCEDURE department_list( ) READS SQL DATA SELECT department_name,locatio n from departments;

$sql = "call department_list( )";
$results = $mysqli->query($sql);
if ($mysqli->errno) {
die("Execution failed: ".$mysqli->errno.": ".$mysqli->error);
}
while ($row = $results->fetch_object( )) {
printf("%s %s ", $row->department_name, $row->locatio n);
}
?>

有输入参数和返回结果集的存储过程

CREATE PROCEDURE customers_for_rep(in_sales_rep_id INT) READS SQL DATA SELECT customer_id,customer_name FROM customers WHERE sales_rep_id=in_sales_rep_id;

$sql = "CALL customers_for_rep(?)";
$stmt = $mysqli->prepare($sql);
if ($mysqli->errno) {die($mysqli->errno.":: ".$mysqli->error);}
$stmt->bind_param("i", $in_sales_rep_id);
$in_sales_rep_id = 1;
$stmt->execute( );
if ($mysqli->errno) {die($mysqli->errno.": ".$mysqli->error);}
$stmt->bind_result($customer_id,$customer_name);
while ($stmt->fetch( )) {
printf("%d %s ", $customer_id,$customer_name);
}
?>

输出参数的处理

CREATE PROCEDURE sp_rep_customer_count(in_emp_id DECIMAL(8,0), OUT out_cust_count INT) NOT DETERMINISTIC READS SQL DATA BEGIN SELECT count(*) INTO out_cust_count FROM customers WHERE sales_rep_id=in_emp_id; END;

$sql="CALL sp_rep_customer_count(1,@customer_count)";
$stmt = $mysqli->prepare($sql);
if ($mysqli->errno) {die($mysqli->errno.": ".$mysqli->error);}
$stmt->execute( );
if ($mysqli->errno) {die($mysqli->errno.": ".$mysqli->error);}
$stmt->close( );
$results = $mysqli->query("SELECT @customer_count AS customer_count");
$row = $results->fetch_object( );
printf("Customer count=%d ",$row->customer_count);
?>

多结果集处理

CREATE PROCEDURE stored_proc_with_2_results(in_sales_rep_id INT) DETERMINISTIC READS SQL DATA BEGIN SELECT employee_id,surname,firstname FROM employees WHERE employee_id=in_sales_rep_id; SELECT customer_id,customer_name FROM customers WHERE sales_rep_id=in_sales_rep_id; END;

$query = "call stored_proc_with_2_results( $employee_id )";
if ($mysqli->multi_query($query)) {
    $result = $mysqli->store_result( );
    while ($row = $result->fetch_object( )) {
       printf("%d %s %s ",$row->employee_id,$row->surname,$row->firstname);
    }
    $mysqli->next_result( );
    $result = $mysqli->store_result( );
    while ($row = $result->fetch_object( )) {
        printf("%d %s ",$row->customer_id,$row->customer_name);
     }
}
?>

不确定结果集数的处理

$query = "call stored_proc_with_2_results( $employee_id )";
if ($mysqli->multi_query($query)) {
   do {
      if ($result = $mysqli->store_result( )) {
         while ($finfo = $result->fetch_field( )) {
             printf("%s ", $finfo->name);
         }
         printf(" ");
         while ($row = $result->fetch_row( )) {
            for ($i=0;$ifield_count;$i++) {
               printf("%s ", $row[$i]);
            }
             printf(" ");
          }
          $result->close( );
       }
} while ($mysqli->next_result());
}
?>

PDO

连接数据库

$dsn = 'mysql:dbname=prod;host=localhost;port=3305';
$user = 'root';
$password = 'secret';
try {
$dbh = new PDO($dsn, $user, $password);
}
catch (PDOException $e) {
die('Connection failed: '.$e->getMessage( ));
}
print "Connected ";
?>

简单查询

$sql="CREATE TABLE my_numbers (a_number INT)";
$dbh->exec($sql);
?>

$rows=$dbh->exec("INSERT INTO my_numbers VALUES (1), (2), (3)");
printf("%d rows inserted ",$rows);
?>

错误处理

$sql="CREATE TABLE my_numbers (a_number INT)";
$dbh->exec($sql);
if ($dbh->errorCode( )'00000') {
$error_array=$dbh->errorInfo( );
printf("SQLSTATE : %s ",$error_array[0]);
printf("MySQL error code : %s ",$error_array[1]);
printf("Message : %s ",$error_array[2]);
}
?>

$sql="CREATE TABLE my_numbers (a_number INT)";
$dbh->exec($sql);
if ($dbh->errorCode( )'00000') {
die("Error: ".implode(': ',$dbh->errorInfo( ))." ");
}
?>

事务管理

$dbh->beginTransaction( );
$dbh->exec("UPDATE account_balance SET balance=balance-$tfer_amount WHERE account_id=$from_account");
if ($dbh->errorCode( )'00000') {
   printf("transaction aborted: %s ",implode(': ',$dbh->errorInfo( )));
   $dbh->rollback( );
}
else {
   $dbh->exec("UPDATE account_balance SET balance=balance+$tfer_amount WHERE account_id=$to_account");
   if ($dbh->errorCode( )'00000')   {
       printf("transaction aborted: %s ",implode(': ',$dbh->errorInfo( )));
       $dbh->rollback( );
   }
   else {
      printf("transaction succeeded ");
      $dbh->commit( );
}
}
?>

结果集处理

$sql = 'SELECT department_id,department_name FROM departments';
foreach ($dbh->query($sql) as $row) {
printf("%d %s ",$row['department_id'],$row['department_name']);
}
?>

$sql = 'SELECT department_id,department_name FROM departments';
foreach ($dbh->query($sql) as $row) {
printf("%d %s ",$row[0],$row[1]);
}
?>

prepare语句

$sql = 'INSERT INTO my_numbers VALUES(1),(2),(3)';
$sth = $dbh->prepare($sql);
$sth->execute() or die (implode(':',$sth->errorInfo( )));
?>

从prepare语句中返回结果集

$sql='SELECT department_id,department_name FROM departments LIMIT 5';
$sth=$dbh->prepare($sql) or die (implode(':',$sth->errorInfo( )));
$sth->execute() or die (implode(':',$sth->errorInfo( )));
while($row=$sth->fetch( )) {
printf("%d %s ",$row['department_id'],$row['department_name']);
}
?>

为prepare绑定数据

$sql='SELECT customer_id,customer_name FROM customers WHERE sales_rep_id=:sales_rep_id AND contact_surname=:surname';
$sth = $dbh->prepare($sql);
if ($dbh->errorCode( )'00000') {
die("Error: ".implode(': ',$dbh->errorInfo( ))." ");
}
$sth->bindParam(':sales_rep_id', $sales_rep_id, PDO::PARAM_INT);
$sth->bindParam(':surname', $surname, PDO::PARAM_STR, 30);
$sales_rep_id=41;
$surname = 'SMITH';
$sth->execute( );
if ($dbh->errorCode( )'00000') {
die("Error: ".implode(': ',$dbh->errorInfo( ))." ");
}
while($row=$sth->fetch( )) {
printf("%d %s ",$row['customer_id'],$row['customer_name']);
}
?>

查询 metadata

$sth = $dbh->prepare("SELECT employee_id,surname,date_of_birth FROM employees where employee_id=1");
$sth->execute() or die (implode(':',$sth->errorInfo( )));
$cols=$sth->columnCount( );
for ($i=0; $igetColumnMeta($i);
printf(" Details for column %d ",$i+1);
printf(" Name: %s ",$metadata["name"]);
printf(" Datatype: %s ",$metadata["native_type"]);
printf(" Length: %d ",$metadata["len"]);
printf(" Precision: %d ",$metadata["precision"]);
}
?>

执行简单存储过程

$sql='call simple_stored_proc( )';
$dbh->exec($sql);
if ($dbh->errorCode( )'00000') {
die("Error: ".implode(': ',$dbh->errorInfo( ))." ");
}
?>

单个结果集的存储过程

$sql = 'call stored_proc_with_1_result( )';
foreach ($dbh->query($sql) as $row) {
printf("%d %s ",$row[0],$row[1]);
}
?>

$sql='call stored_proc_with_1_result( )';
$sth=$dbh->prepare($sql) or die (implode(':',$sth->errorInfo( )));
$sth->execute() or die (implode(':',$sth->errorInfo( )));
while($row=$sth->fetch( )) {
printf("%s %s ",$row['department_name'],$row['locatio n']);
}
?>

绑定输入参数

$sql='CALL customers_for_rep(:sales_rep_id,:surname)';
$sth = $dbh->prepare($sql);
if ($dbh->errorCode( )'00000') {
die("Error: ".implode(': ',$dbh->errorInfo( ))." ");
}
$sth->bindParam(':sales_rep_id', $sales_rep_id, PDO::PARAM_INT);
$sth->bindParam(':surname', $surname, PDO::PARAM_STR, 30);
$sales_rep_id=41;
$surname = 'SMITH';
$sth->execute( );
?>

多结果集处理

$sth = $dbh->prepare("call stored_proc_with_2_results( $employee_id )");
$sth->execute() or die (implode(':',$sth->errorInfo( )));
while ($row1=$sth->fetch( )) {
printf("%d %s %s ",$row1['employee_id'],$row1['surname'],$row1['firstname']);
}
$sth->nextRowset( );
while ($row2=$sth->fetch( )) {
printf("%d %s ",$row2['customer_id'],$row2['customer_name']);
}
?>

不确定结果集数量的处理

CREATE PROCEDURE sp_employee_report(in_emp_id decimal(8,0)) READS SQL DATA BEGIN DECLARE customer_count INT; SELECT surname,firstname,date_of_birth FROM employees WHERE employee_id=in_emp_id; SELECT department_id,department_name FROM departments WHERE department_id=(select department_id FROM employees WHERE employee_id=in_emp_id); SELECT count(*) INTO customer_count FROM customers WHERE sales_rep_id=in_emp_id; IF customer_count=0 THEN SELECT 'Employee is not a current sales rep'; ELSE SELECT customer_name,customer_status FROM customers HERE sales_rep_id=in_emp_id; SELECT customer_name,sum(sale_value) FROM sales JOIN customers USING (customer_id) WHERE customers.sales_rep_id=in_emp_id GROUP BY customer_name; END IF;

输出参数
CREATE PROCEDURE 'sp_rep_customer_count'(in_emp_id DECIMAL(8,0),OUT out_cust_count INT) READS SQL DATA BEGIN SELECT count(*) AS cust_count INTO out_cust_count FROM customers WHERE sales_rep_id=in_emp_id; END ;

$sql = "call sp_rep_customer_count(?,?)";
$sth = $dbh->prepare($sql) or die(implode(':', $sth->errorInfo( )));
$sth->bindParam(1,$sales_rep_id,PDO::PARAM_STR,4000);
$sth->bindParam(2,$customer_count, PDO::PARAM_INT|PDO::PARAM_INPUT_OUTPUT);
$sth->execute() or die(implode(':', $sth->errorInfo( )));
?>

不使用bindParam获得输出参数

$sql="call sp_rep_customer_count(1,@customer_count)";
$sth = $dbh->prepare($sql);
$sth->execute() or die (implode(':',$sth->errorInfo( )));
$sql="SELECT @customer_count";
foreach ($dbh->query($sql) as $row) {
printf("Customer count=%d ",$row[0]);
}
?>

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