How to execute the following query
select * from table1 union select * from table2
in zend-framework2 where i am using tablegateway? In the documentation of zf2,they didn't give any details about union query.
Try -
$select1 = new Select('table1');
[.... rest of the code ....]
$select2 = new Select('table2');
[.... rest of the code ....]
$select1->combine($select2); //This will create the required SQL union statement.
To get count of the two tables you have to use a bit of SQL rather then tableGateway -
$sql = new Sql($this->tableGateway->adapter);
$select_string = $sql->getSqlStringForSqlObject($select1);
$sql_string = 'SELECT * FROM (' . $select_string . ') AS select_union';
$statement = $this->tableGateway->adapter->createStatement($sql_string);
$resultSet = $statement->execute();
$total_records = count($resultSet);
$resultSet gives data.
$total_records gives total no. of records.
Related
Im executing this query:
$query = "
Select * From table1 Where id = 1;
Select * From table2 Where name = 'test';
";
With \Zend\Db\Adapter\Adapter:
$stmt = $this->dbAdapter->query($query);
$rawResult = $stmt->execute();
How can I access the second result?
$rawResult->next() only returns values from first query.
Use two different queries.
/*
* First Query
*/
$query = "
Select * From table1 Where id = 1
";
$stmt = $this->dbAdapter->query($query);
$rawResult = $stmt->execute();
/*
* Second Query
*/
$query = "
Select * From table2 Where name = 'test'
";
$stmt = $this->dbAdapter->query($query);
$rawResult = $stmt->execute();
I don't believe it works the way you had it to where two queries in a row are sent this way.
To avoid code duplication you can wrap the duplicated code into a method.
$rawResult1 = $this->getResults("Select * From table1 Where id = 1");
$rawResult2 = $this->getResults("Select * From table2 Where name = 'test'");
function getResults(string $query)
{
$stmt = $this->dbAdapter->query($query);
return $stmt->execute();
}
Hi i am new to oracle_sqldeveloper can you please give me the answer how to know the table structure and relationships of a database.
You can try
DESC <table_name>
Try this:
select table_name, column_name, data_type
from all_tab_columns
where table_name = <TABLE_NAME_HERE>
and owner = '<YOUR_USER_HERE_IN_CAPITAL_LETTERS>'
If you have comments on your table then to get columns' comments:
select tc.table_name, tc.column_name, tc.data_type, cc.comments
from all_col_comments cc, all_tab_columns tc
where tc.table_name = <TABLE_NAME_HERE>
and tc.owner = <OWNER_OF_TABLE_HERE>
and tc.table_name = cc.table_name
and tc.column_name = cc.column_name
and tc.owner = cc.owner
If you are logged in under owner of the table you can write this:
select table_name, column_name, data_type
from user_tab_columns
where table_name = <TABLE_NAME_HERE>
or to get columns with comments
select tc.table_name, tc.column_name, tc.data_type, cc.comments
from user_col_comments cc, user_tab_columns tc
where tc.table_name = '<TABLE_NAME_HERE>'
and tc.owner = '<YOUR_USER_HERE_IN_CAPITAL_LETTERS>'
and tc.table_name = cc.table_name
and tc.column_name = cc.column_name
To get relationships between tables user this query:
select uc1.table_name
, uc1.constraint_name
, cc1.column_name
, uc2.table_name r_table_name
, uc2.constraint_name r_constraint_name
, cc2.column_name r_column_name
from all_constraints uc1
, all_constraints uc2
, all_cons_columns cc1
, all_cons_columns cc2
where 1 = 1
and uc2.constraint_type = 'R'
and uc1.constraint_name = uc2.r_constraint_name
and cc1.table_name = uc1.table_name
and cc1.constraint_name = uc1.constraint_name
and cc2.table_name = uc1.table_name
and cc2.constraint_name = uc1.constraint_name
and uc1.owner = '<YOUR_USER_HERE_IN_CAPITAL_LETTERS>'
and uc2.owner = uc1.owner
and cc1.owner = uc1.owner
and cc2.owner = uc1.owner
order by 1
/
Columns with the "R_" prefix mean that they are foreign data (they represent foreign keys). As you can see, I used the tables with the "ALL_" prefix, to use similar tables with the "USER_" prefix, get rid of the "OWNER" section.
To know more about oracle data dictionary read this
1) type your table name.
2) right click on table name & click Open Declaration.
When using the SqlBuilder class of DBExtensions, is it possible to build multiple select statements that are executed in a single round trip?
Something along the lines of:
select t1.* from Table1 t1 where t1.Foo = 'Bar 1';
select t2.* from Table2 t2 where t2.Foo = 'Bar 2';
For the building part, you can do:
var query1 = SQL
.SELECT("t1.*")
.FROM("Table1 t1")
.WHERE("t1.Foo = {0}", "Bar 1");
var query2 = SQL
.SELECT("t2.*")
.FROM("Table2 t2")
.WHERE("t2.Foo = {0}", "Bar 2");
var batchQuery = SqlBuilder.JoinSql(";", query1, query2);
About execution, I have no idea if your ADO.NET provider supports batch SELECT queries, maybe you want to do a UNION query instead?
With only one query I want to fetch specific rows that contains a range of several string values. Is it possible to modify my WHERE to do this?
This is the code for one country but I want to select several rows for several countries. For example: Jamaica, Portugal and Dominica.
// Select countries to show
$specific_country = Dominica;
// Select and write SPECIFIC ROWS data
$result = mysqli_query($con, "SELECT * FROM $table WHERE Country='$specific_country'");
This will only get the rows of Dominica but I wanted to use something similar to get Jamaica, Portugal and Dominica but all on the same query.
You can use IN()
SELECT *
FROM table_name
WHERE Country IN('Jamaica', 'Portugal', 'Dominica')
Here is SQLFiddle demo
In php
$countries = array('Jamaica', 'Portugal', 'Dominica');
$sql = "SELECT * FROM table_name WHERE Country IN('". implode("','", $countries) . "')";
$result = mysqli_query($con, $sql);
...
I want to convert this query in yii
SELECT count(*) AS cnt, date(dt) FROM tbl_log where status=2 GROUP BY date(dt)
and fetch data from that. I try this command (dt is datetime field):
$criteria = new CDbCriteria();
$criteria->select = 'count(*) as cnt, date(dt)';
$criteria->group = 'date(dt)';
$criteria->condition = 'status= 2';
$visit_per_day = $this->findAll($criteria);
but no data will fetch!
wath can I do to get data?
Probably you see no data because you need assign data to model attributes which doesn't exist.
$criteria = new CDbCriteria();
$criteria->select = 'count(*) AS cnt, date(dt) AS dateVar';
$criteria->group = 'date(dt)';
$criteria->condition = 'status= 2';
$visit_per_day = $this->findAll($criteria);
This means that your model must have attributes cnt and dateVar in order to show your data. If you need custom query then check Hearaman's answer.
Try this below code
$logs = Yii::app()->db->createCommand()
->select('COUNT(*) as cnt')
->from('tbl_log') //Your Table name
->group('date')
->where('status=2') // Write your where condition here
->queryAll(); //Will get the all selected rows from table
Number of visitor are:
echo count($logs);
Apart from using cDbCriteria, to do the same check this link http://www.yiiframework.com/forum/index.php/topic/10662-count-on-a-findall-query/
If you use Yii2 and have a model based on table tbl_log, you can do it in model style like that:
$status = 2;
$result = Model::find()
->select('count(*) as cnt, date(dt)')
->groupBy('date(dt)')
->where('status = :status')
->params([':status' => $status ])
->all();