Collection of commonly used PHP ADODB usage methods_PHP tutorial

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//Define database variables 
$DB_TYPE = "mysql"; 
$DB_HOST = "localhost"; 
$DB_ USER = "root" ;      ion(" $DB_TYPE");//Create a database object 
$db->debug = true;//DEBUG test of the database, the default value is false 
$ADODB_FETCH_MODE = ADODB_FETCH_ASSOC;//Returned record set form, association Form                                                                                                      OC',2 ; , is a numeric form, that is, the sort order value of the database field. The index in the record set returned by
ADODB_FETCH_ASSOC is the original database field name.
ADODB_FETCH_BOTH and ADODB_FETCH_DEFAULT return the above two at the same time.Some databases do not support it.
An example: $ADODB_FETCH_MODE = ADODB_FETCH_NUM;
🎜> $ADODB_FETCH_MODE = ADODB_FETCH_ASSOC;
$rs2 = $db->Execute('select * from table');
print_r($rs1->fields); # The returned array is: array([0]=>'v0', [1] =>'v1')                                                                                                                                                ;'v1')                                                                                 DB_HOST", "$DB_USER", "$DB_PASS", "$DB_DATABASE")) { );                                                            >SelectLimit($sql,$numrows=-1,$offset=-1) $numrows: how many records to fetch, $offset, which number to start fetching from, usually used for paging, or when only fetching a few records Use                                                                                                               $sql)) {//Execute the SQL statement and return the result to the $rs variable      
  echo $db->ErrorMsg();//This is to print the error message          
   $db->Close() ;//Close the database                                                                                                                                                     .'
'; rs->MoveNext();//Point the pointer to the next record, otherwise an infinite loop will occur!
$rs->Close();//Close to release memory   

//Insert new record   
$sql = “Insert table (user_type,username) VALUES (3, 'liucheng’ )"; "
$db->Execute($sql); "

//Update record " db->Execute($sql);                                                                                                                                                                                                                                                                               

//Get a single record                                                                                                                                        // $db-> GetRow($sql), fetch the first record, and return an array, return false                                                   ,password,user_type FROM table Where id=3"; "
$data_ary = $db->GetRow($sql); "
if ($data_ary == false) { "This record was not found" ';
';                                                                          rs = $db->Execute($sql)) {                                               
}
if (!$result = $rs->FetchRow()) {                                                                                          echo $result[ 'username'] . ' ' . $result['password'] . ' ' . $result['user_type'] . '
'; '
}        

// 取单个字段        
//$db->GetOne($sql) 取出第一条记录的第一个字段的值,出错则返回false        
$sql = "Select COUNT(id) FROM table";        
$record_nums = $db->GetOne($sql);        
echo $record_nums;        
$sql = "Select username,password,user_type FROM table Where user_id=1";        
$result = $db->GetOne($sql);        
echo $result;//打印出username的值        
/*      
在进行添加,修改,删除记录操作时,      
要对字符串型的字段,使用$db->qstr()对用户输入的字符进行处理,      
对数字型字段,要进行数据判断      
更新记录,注意:这是针对php.ini中,magic_quotes被设置为Off的情况,如果不确定,可以使用      
$db->qstr($content,get_magic_quotes_gpc())      
注意:content= 等号右边,没有单引号      
*/       
$sql = "Update table SET content=" . $db->qstr($content) . " Where id=2";        
$db->Execute($sql);        

       
/*$db->Insert_ID(),无参数,返回刚刚插入的那条记录的ID值,仅支持部分数据库,带auto-increment功能的数据库,如PostgreSQL, MySQL 和 MS SQL       
*/       
//Example:        
$sql = "Insert table (user_type,username) VALUES (3, 'liucheng')";        
$db->Execute($sql);        
$data_id = $db->Insert_ID();        
echo $data_id;        

/*$db->GenID($seqName = 'adodbseq',$startID=1),产生一个ID值.$seqName:用于产生此ID的数据库表名,$startID:起始值,一般不用设置,它会把$seqName中的值自动加1.支持部分数据库,某些数据库不支持      

Insert_ID,GenID,一般我用GenID,使用它的目的,是在插入记录后,要马上得到它的ID时,才用      
*/       
/*Example:      
先创建一个列名为user_id_seq的表,里面只有一个字段,id,int(10),NOT NULL,然后插入一条值为0的记录      
*/       
$user_id = $db->GenID('user_id_seq');        
$sql = "Insert table (id, user_type,username) VALUES (" . $user_id . ", 3, 'liucheng')";        
$db->Execute($sql);        

/*      
$rs->RecordCount(),取出记录集总数,无参数      
它好像是把取出的记录集,用count()数组的方法,取得数据的数量      
如果取大量数据,效率比较慢,建议使用SQL里的COUNT(*)的方法      
$sql = "Select COUNT(*) FROM table", 用此方法时,不要在SQL里加ORDER BY,那样会降低执行速度      

Example:      
*/       
$sql = "Select * FROM table orDER BY id DESC";        
if (!$rs = $db->Execute($sql)) {        
    echo $db->ErrorMsg();        
$db->Close();                                                          someone To perform the same loop processing twice for one result set, you can use the following method    
The following is just an example to illustrate the use of $rs->MoveFirst()      
*/   
$sql = "Select * FROM table orDER BY id DESC"; ;
if (!$rs = $db->Execute($sql)) { db->Close(); ; $username_ary[] = $rs->fields['username']                                                                                                                                                                                          rs->fields['Field name'], returns the value in this field     
   $rs->MoveNext();//Point the pointer to the next record, if not used, an infinite loop will occur!
} 
$username_ary = array_unique($username_ary); 

$rs->MoveFirst();//Point the pointer back to the first record 
while (!$rs- > EOF) { echo Field name'], what is returned is the value in this field                                                                                                                            

//When the program on this page completes the operation of the database, $db->Close();
$db->Close();

/* A good method */                                                                                                                                  



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Copy the code as follows: ?php //Define database variables $DB_TYPE="mysql"; $DB_HOST="localhost "; $DB_USER="root"; $DB_PASS=""; $DB_DATABASE="ai-part"; require_once("../adodb/adodb.i...