Laravel 数据库查询生成器 - 使用多个 'from' 和别名
Laravel DB query builder - using multiple 'from' with aliases
我有以下查询:
SELECT
cd_4.userfield,
COUNT( DISTINCT (Case When cd_4.disposition_Last = 'ANSWERED' Then cd_4.uniqueid ELSE NULL END) ) AS Answered_Count,
COUNT( DISTINCT (Case When cd_4.disposition_Last <> 'ANSWERED' Then cd_4.uniqueid ELSE NULL END) ) AS Not_Answered_Count
FROM (
SELECT
cd_2.Userfield,
cd_2.Start_Date,
cd_2.uniqueid,
cd_2.Row_Id_Max,
cd_3.disposition AS disposition_Last
FROM (
SELECT
cd_1.userfield,
cd_1.Start_Date,
cd_1.uniqueid,
MAX(cd_1.Row_Id) AS Row_Id_Max
FROM
cdrnew As cd_1
WHERE (
cd_1.Start_Date BETWEEN '2020-12-01' AND '2020-12-10'
)
AND cd_1.userfield = 'Inbound'
GROUP BY
cd_1.userfield,
cd_1.Start_Date,
cd_1.uniqueid
) AS cd_2
INNER JOIN cdrnew As cd_3
ON cd_3.Row_Id = cd_2.Row_Id_Max
WHERE (
cd_3.Start_Date BETWEEN '2020-12-01' AND '2020-12-10'
)
AND cd_3.userfield = 'Inbound'
) AS cd_4 ;
我有 4 个别名用于上面的 table cdrnew 名为 cd_1, cd_2, cd_3 和 cd_4
我想使用 laravel 查询生成器实现相同的目的:
我尝试了以下 laravel 查询:
$sqlquery = DB::table('cdrnew')->select('cdrnew.userfield')
->addSelect(DB::raw('COUNT(DISTINCT (
Case When cdrnew.disposition = "ANSWERED" Then cdrnew.uniqueid ELSE NULL END
)) as Answered_Count'))
->addSelect(DB::raw('COUNT(DISTINCT (
Case When cdrnew.disposition <> "ANSWERED" Then cdrnew.uniqueid ELSE NULL END
)) as Not_Answered_Count'))
->addSelect(DB::raw('cdrnew.Start_Date, cdrnew.uniqueid, MAX(cdrnew.Row_Id) AS Row_Id_Max'))
->whereBetween('cdrnew.Start_Date', ["2020-12-12", "2020-12-15"])
->groupBy('userfield','Start_Date','uniqueid')
->join('cdrnew AS cd_1',"cdrnew.Row_Id", "=", "cd_1.Row_Id")
->limit(10)->get();
但我只能创建两个别名。一个是 DB::Table(cdrnew) 的默认值,另一个是 join(cd_1) 的默认值。我们如何在 laravel 中创建多个 'from' 语句以及不同的别名?
例如:
- 来自 cdrnew 作为 cd_1(别名 1)。
- 来自 cdrnew 作为 cd_2(别名 2)。
- 来自 cdrnew 作为 cd_3(别名 3)。
- .......等等
table
和 from
方法的工作原理相似。它们可以接受 2 个参数,table(可以是 Closure
或 Builder
实例)和别名。据我所知,唯一的区别是 table
必须是 DB::
之后调用的第一个方法
例如下面的查询
SELECT * FROM (
SELECT * FROM table1 WHERE condition = "something"
) AS alias1
可以用Closure
这样写。
DB::table(function ($subquery) {
return $subquery->from('table1')->where('condition', 'something');
}, 'alias')
->get();
// Or using PHP7.4 short Closures
DB::table(fn($subquery) => $subquery->from('table1')->where('condition', 'something'), 'alias')->get();
或者像这样使用 Builder
实例。
$alias = DB::table('table1')->where('condition', 'something');
DB::table($alias, 'alias')->get();
所以您的查询可以使用构建器翻译成如下内容
$cd_2 = DB::table('cdrnew, cd_1')
->select(
'cd_1.userfield',
'cd_1.Start_Date',
'cd_1.uniqueid',
)
->selectRaw('MAX(cd_1.Row_Id) AS Row_Id_Max')
->whereBetween('cd_1.Start_Date', ['2020-12-01', '2020-12-10'])
->where('cd_1.userfield', 'Inbound')
->groupBy(
'cd_1.userfield',
'cd_1.Start_Date',
'cd_1.uniqueid'
);
$cd_4 = DB::table($cd_2, 'cd_2')
->select(
'cd_2.Userfield',
'cd_2.Start_Date',
'cd_2.uniqueid',
'cd_2.Row_Id_Max',
'cd_3.disposition AS disposition_Last'
)
->join('cdrnew AS cd_3', 'cd_3.Row_Id', '=', 'cd_2.Row_Id_Max')
->whereBetween('cd_3.Start_Date', ['2020-12-01', '2020-12-10'])
->where('cd3.userfield', 'Inbound');
$query = DB::table($cd_4, 'cd_4')
->select('cd_4.userfield')
->selectRaw('COUNT(DISTINCT(CASE WHEN cd_4.disposition_Last = "ANSWERED" THEN cd_4.uniqueid ELSE NULL END)) AS Answered_Count')
->selectRaw('COUNT(DISTINCT(CASE WHEN cd_4.disposition_Last <> "ANSWERED" THEN cd_4.uniqueid ELSE NULL END)) AS Not_Answered_Count');
// Uncomment next line to see the query produced. It should be the same you posted in your question.
// dd($query->toSql());
$results = $query->get();
或者像这样使用 Closures
$query = DB::table(function ($cd_4) {
return $cd_4->from(function ($cd_2) {
return $cd_2->from('cdrnew, cd_1')
->select(
'cd_1.userfield',
'cd_1.Start_Date',
'cd_1.uniqueid',
)
->selectRaw('MAX(cd_1.Row_Id) AS Row_Id_Max')
->whereBetween('cd_1.Start_Date', ['2020-12-01', '2020-12-10'])
->where('cd_1.userfield', 'Inbound')
->groupBy(
'cd_1.userfield',
'cd_1.Start_Date',
'cd_1.uniqueid'
);
}, 'cd_2')
->select(
'cd_2.Userfield',
'cd_2.Start_Date',
'cd_2.uniqueid',
'cd_2.Row_Id_Max',
'cd_3.disposition AS disposition_Last'
)
->join('cdrnew AS cd_3', 'cd_3.Row_Id', 'cd_2.Row_Id_Max')
->whereBetween('cd_3.Start_Date', ['2020-12-01', '2020-12-10'])
->where('cd3.userfield', 'Inbound');
}, 'cd_4')
->select('cd_4.userfield')
->selectRaw('COUNT(DISTINCT(CASE WHEN cd_4.disposition_Last = "ANSWERED" THEN cd_4.uniqueid ELSE NULL END)) AS Answered_Count')
->selectRaw('COUNT(DISTINCT(CASE WHEN cd_4.disposition_Last <> "ANSWERED" THEN cd_4.uniqueid ELSE NULL END)) AS Not_Answered_Count');
// Uncomment next line to see the query produced. It should be the same you posted in your question.
// dd($query->toSql());
$results = $query->get();
据我所知,生成的查询是相同的。
我有以下查询:
SELECT
cd_4.userfield,
COUNT( DISTINCT (Case When cd_4.disposition_Last = 'ANSWERED' Then cd_4.uniqueid ELSE NULL END) ) AS Answered_Count,
COUNT( DISTINCT (Case When cd_4.disposition_Last <> 'ANSWERED' Then cd_4.uniqueid ELSE NULL END) ) AS Not_Answered_Count
FROM (
SELECT
cd_2.Userfield,
cd_2.Start_Date,
cd_2.uniqueid,
cd_2.Row_Id_Max,
cd_3.disposition AS disposition_Last
FROM (
SELECT
cd_1.userfield,
cd_1.Start_Date,
cd_1.uniqueid,
MAX(cd_1.Row_Id) AS Row_Id_Max
FROM
cdrnew As cd_1
WHERE (
cd_1.Start_Date BETWEEN '2020-12-01' AND '2020-12-10'
)
AND cd_1.userfield = 'Inbound'
GROUP BY
cd_1.userfield,
cd_1.Start_Date,
cd_1.uniqueid
) AS cd_2
INNER JOIN cdrnew As cd_3
ON cd_3.Row_Id = cd_2.Row_Id_Max
WHERE (
cd_3.Start_Date BETWEEN '2020-12-01' AND '2020-12-10'
)
AND cd_3.userfield = 'Inbound'
) AS cd_4 ;
我有 4 个别名用于上面的 table cdrnew 名为 cd_1, cd_2, cd_3 和 cd_4
我想使用 laravel 查询生成器实现相同的目的:
我尝试了以下 laravel 查询:
$sqlquery = DB::table('cdrnew')->select('cdrnew.userfield')
->addSelect(DB::raw('COUNT(DISTINCT (
Case When cdrnew.disposition = "ANSWERED" Then cdrnew.uniqueid ELSE NULL END
)) as Answered_Count'))
->addSelect(DB::raw('COUNT(DISTINCT (
Case When cdrnew.disposition <> "ANSWERED" Then cdrnew.uniqueid ELSE NULL END
)) as Not_Answered_Count'))
->addSelect(DB::raw('cdrnew.Start_Date, cdrnew.uniqueid, MAX(cdrnew.Row_Id) AS Row_Id_Max'))
->whereBetween('cdrnew.Start_Date', ["2020-12-12", "2020-12-15"])
->groupBy('userfield','Start_Date','uniqueid')
->join('cdrnew AS cd_1',"cdrnew.Row_Id", "=", "cd_1.Row_Id")
->limit(10)->get();
但我只能创建两个别名。一个是 DB::Table(cdrnew) 的默认值,另一个是 join(cd_1) 的默认值。我们如何在 laravel 中创建多个 'from' 语句以及不同的别名?
例如:
- 来自 cdrnew 作为 cd_1(别名 1)。
- 来自 cdrnew 作为 cd_2(别名 2)。
- 来自 cdrnew 作为 cd_3(别名 3)。
- .......等等
table
和 from
方法的工作原理相似。它们可以接受 2 个参数,table(可以是 Closure
或 Builder
实例)和别名。据我所知,唯一的区别是 table
必须是 DB::
例如下面的查询
SELECT * FROM (
SELECT * FROM table1 WHERE condition = "something"
) AS alias1
可以用Closure
这样写。
DB::table(function ($subquery) {
return $subquery->from('table1')->where('condition', 'something');
}, 'alias')
->get();
// Or using PHP7.4 short Closures
DB::table(fn($subquery) => $subquery->from('table1')->where('condition', 'something'), 'alias')->get();
或者像这样使用 Builder
实例。
$alias = DB::table('table1')->where('condition', 'something');
DB::table($alias, 'alias')->get();
所以您的查询可以使用构建器翻译成如下内容
$cd_2 = DB::table('cdrnew, cd_1')
->select(
'cd_1.userfield',
'cd_1.Start_Date',
'cd_1.uniqueid',
)
->selectRaw('MAX(cd_1.Row_Id) AS Row_Id_Max')
->whereBetween('cd_1.Start_Date', ['2020-12-01', '2020-12-10'])
->where('cd_1.userfield', 'Inbound')
->groupBy(
'cd_1.userfield',
'cd_1.Start_Date',
'cd_1.uniqueid'
);
$cd_4 = DB::table($cd_2, 'cd_2')
->select(
'cd_2.Userfield',
'cd_2.Start_Date',
'cd_2.uniqueid',
'cd_2.Row_Id_Max',
'cd_3.disposition AS disposition_Last'
)
->join('cdrnew AS cd_3', 'cd_3.Row_Id', '=', 'cd_2.Row_Id_Max')
->whereBetween('cd_3.Start_Date', ['2020-12-01', '2020-12-10'])
->where('cd3.userfield', 'Inbound');
$query = DB::table($cd_4, 'cd_4')
->select('cd_4.userfield')
->selectRaw('COUNT(DISTINCT(CASE WHEN cd_4.disposition_Last = "ANSWERED" THEN cd_4.uniqueid ELSE NULL END)) AS Answered_Count')
->selectRaw('COUNT(DISTINCT(CASE WHEN cd_4.disposition_Last <> "ANSWERED" THEN cd_4.uniqueid ELSE NULL END)) AS Not_Answered_Count');
// Uncomment next line to see the query produced. It should be the same you posted in your question.
// dd($query->toSql());
$results = $query->get();
或者像这样使用 Closures
$query = DB::table(function ($cd_4) {
return $cd_4->from(function ($cd_2) {
return $cd_2->from('cdrnew, cd_1')
->select(
'cd_1.userfield',
'cd_1.Start_Date',
'cd_1.uniqueid',
)
->selectRaw('MAX(cd_1.Row_Id) AS Row_Id_Max')
->whereBetween('cd_1.Start_Date', ['2020-12-01', '2020-12-10'])
->where('cd_1.userfield', 'Inbound')
->groupBy(
'cd_1.userfield',
'cd_1.Start_Date',
'cd_1.uniqueid'
);
}, 'cd_2')
->select(
'cd_2.Userfield',
'cd_2.Start_Date',
'cd_2.uniqueid',
'cd_2.Row_Id_Max',
'cd_3.disposition AS disposition_Last'
)
->join('cdrnew AS cd_3', 'cd_3.Row_Id', 'cd_2.Row_Id_Max')
->whereBetween('cd_3.Start_Date', ['2020-12-01', '2020-12-10'])
->where('cd3.userfield', 'Inbound');
}, 'cd_4')
->select('cd_4.userfield')
->selectRaw('COUNT(DISTINCT(CASE WHEN cd_4.disposition_Last = "ANSWERED" THEN cd_4.uniqueid ELSE NULL END)) AS Answered_Count')
->selectRaw('COUNT(DISTINCT(CASE WHEN cd_4.disposition_Last <> "ANSWERED" THEN cd_4.uniqueid ELSE NULL END)) AS Not_Answered_Count');
// Uncomment next line to see the query produced. It should be the same you posted in your question.
// dd($query->toSql());
$results = $query->get();
据我所知,生成的查询是相同的。