<p>Nachdem Sie sich mit den Abfragebedingungen von Yii2 vertraut gemacht haben, verwenden Sie Active
Record ist sehr praktisch zum Abfragen von Daten.
Im Folgenden stellen wir die Assemblierungsmethode von Bedingungen in der Methode where() vor. </p>
<h2 style="font-family:'Microsoft YaHei UI Light', SimHei, SimSun, sans-serif;line-height:1.1;color:rgb(66,139,209);">1 Syntax </h2>
<p style="white-space:pre-wrap;">Yii2 verwendet die Methode <code class="hljs bash" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;"><span class="hljs-built_in">where</span>()</code> (natürlich gibt es auch andere Methoden), um die bedingte Filterung zu implementieren. Syntax: </p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="hljs bash" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;overflow:auto;color:rgb(51,51,51);background-color:rgb(247,247,247);padding:1em;line-height:1.65;">public $this where ( $condition, $params = [] )</pre><div class="contentsignin">Nach dem Login kopieren</div></div><p style="white-space:pre-wrap;"><code class="hljs bash" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;"><span class="hljs-variable" style="color:rgb(223,80,0);">$params</span></code> ist eine optionaler Parameter, der den Wert angibt, an den die Abfrage gebunden werden soll. </p><p style="white-space:pre-wrap;"><code class="hljs bash" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;"><span class="hljs-variable" style="color:rgb(223,80,0);">$condition</span></code> ist ein erforderlicher Parameter, <code class="hljs bash" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;"><span class="hljs-variable" style="color:rgb(223,80,0);">$condition</span></code> kann eine Zeichenfolge (z. B. <code class="hljs bash" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;"><span class="hljs-string" style="color:rgb(223,80,0);">'id=1'</span></code>) oder ein Array sein. Wenn </p><p style="white-space:pre-wrap;"><code class="hljs bash" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;"><span class="hljs-variable" style="color:rgb(223,80,0);">$condition</span></code> ein Array ist, gibt es zwei Formate: </p><ul style="margin-top:0px;list-style-position:inside;" class=" list-paddingleft-2"><li><p>Hash-Format: <code class="hljs json" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;white-space:pre-wrap;">['column1'
=> value1, 'column2' => value2, ...]</code></p></li><li><p> Operation Symbolformat: <code class="hljs json" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;white-space:pre-wrap;">[operator,
operand1, operand2, ...]</code></p></li></ul><h2 style="font-family:'Microsoft YaHei UI Light', SimHei, SimSun, sans-serif;line-height:1.1;color:rgb(66,139,209);">2 Hash-Format </h2><p style="white-space:pre-wrap;">Normalerweise generiert die Abfragebedingung im Hash-Format eine SQL-Anweisung wie diese: </p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false;" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;overflow:auto;color:rgb(51,51,51);background-color:rgb(247,247,247);padding:1em;line-height:1.65;">column1=value1 AND column2=value2 AND ...</pre><div class="contentsignin">Nach dem Login kopieren</div></div><p style="white-space:pre-wrap;">Wenn ein Wert ein Array ist, wird eine <code class="hljs" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;">IN</code>-Anweisung generiert. </p><p style="white-space:pre-wrap;">Wenn ein Wert <code class="hljs coffeescript" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;"><span class="hljs-literal" style="color:rgb(0,134,179);">null</span></code> ist, wird <code class="hljs cpp" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;">IS<span class="hljs-literal" style="color:rgb(0,134,179);">NULL</span></code> zum Generieren der Anweisung verwendet. </p><p style="white-space:pre-wrap;">Beispiel: </p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false;" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;overflow:auto;color:rgb(51,51,51);background-color:rgb(247,247,247);padding:1em;line-height:1.65;">['type' => 1, 'status' => 2]
// 生成：(type = 1) AND (status = 2)['id' => [1, 2, 3], 'status' => 2]
// 生成：(id IN (1, 2, 3)) AND (status = 2)['status' => null]
// 生成：status IS NULL</pre><div class="contentsignin">Nach dem Login kopieren</div></div><h2 style="font-family:'Microsoft YaHei UI Light', SimHei, SimSun, sans-serif;line-height:1.1;color:rgb(66,139,209);">3 Operatorformat </h2><p style="white-space:pre-wrap;">Im Operatorformat generiert Yii SQL-Anweisungen basierend auf dem angegebenen Operator. </p>Die <p style="white-space:pre-wrap;">-Operatoren sind: <code class="hljs coffeescript" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;"><span class="hljs-keyword" style="color:rgb(167,29,93);">and</span></code>, <code class="hljs coffeescript" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;"><span class="hljs-keyword" style="color:rgb(167,29,93);">or</span></code>, <code class="hljs coffeescript" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;"><span class="hljs-keyword" style="color:rgb(167,29,93);">not</span></code>, <code class="hljs" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;">between</code>, <code class="hljs coffeescript" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;"><span class="hljs-keyword" style="color:rgb(167,29,93);">not</span>
between</code>, <code class="hljs bash" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;"><span class="hljs-keyword" style="color:rgb(167,29,93);">in</span></code>, <code class="hljs coffeescript" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;"><span class="hljs-keyword" style="color:rgb(167,29,93);">not</span><span class="hljs-keyword" style="color:rgb(167,29,93);">in</span></code>, <code class="hljs" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;">like</code>, <code class="hljs coffeescript" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;"><span class="hljs-keyword" style="color:rgb(167,29,93);">or</span>
like</code>, <code class="hljs coffeescript" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;"><span class="hljs-keyword" style="color:rgb(167,29,93);">not</span>
like</code>, <code class="hljs coffeescript" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;"><span class="hljs-keyword" style="color:rgb(167,29,93);">or</span><span class="hljs-keyword" style="color:rgb(167,29,93);">not</span> like</code> ,<code class="hljs perl" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;"><span class="hljs-keyword" style="color:rgb(167,29,93);">exists</span></code>,<code class="hljs perl" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;"><span class="hljs-keyword" style="color:rgb(167,29,93);">nicht</span><span class="hljs-keyword" style="color:rgb(167,29,93);">existiert</span></code>、<code class="hljs" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;">></code>、<code class="hljs" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;"><</code>、<code class="hljs" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;">=</code>、<code class="hljs" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;">>=</code>、<code class="hljs" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;"><=</code>、<code class="hljs diff" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;"><span class="hljs-addition" style="color:rgb(85,165,50);background-color:rgb(234,255,234);">!=</span></code>等。</p><h3 style="font-family:'Microsoft YaHei UI Light', SimHei, SimSun, sans-serif;line-height:1.1;color:rgb(66,139,209);">3.1 对比</h3><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false;" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;overflow:auto;color:rgb(51,51,51);background-color:rgb(247,247,247);padding:1em;line-height:1.65;">['>', 'id', 1]
// 生成：id > 1['<', 'id', 100]
// 生成：id < 100['=', 'id', 10]
// 生成：id = 10['>=', 'id', 1]
// 生成：id >= 1['<=', 'id', 100]
// 生成：id != 10</pre><div class="contentsignin">Nach dem Login kopieren</div></div><p style="white-space:pre-wrap;">具体生成的SQL语句，运算符<code class="hljs objectivec" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;"><span class="hljs-keyword" style="color:rgb(167,29,93);">id</span></code>会自动加上反斜杠引号<code class="hljs" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;">`</code>，运算数会自动转义。</p><h3 style="font-family:'Microsoft YaHei UI Light', SimHei, SimSun, sans-serif;line-height:1.1;color:rgb(66,139,209);">3.2 and</h3><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false;" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;overflow:auto;color:rgb(51,51,51);background-color:rgb(247,247,247);padding:1em;line-height:1.65;">['and', 'id' => 1, 'id' => 2]
// 生成：id=1 AND id=2['and', 'id=1', 'id=2']
// 生成：id=1 AND id=2['and', 'type=1', ['or', 'id=1', 'id=2']]
// 生成：type=1 AND (id=1 OR id=2)</pre><div class="contentsignin">Nach dem Login kopieren</div></div><p style="white-space:pre-wrap;">在第2条和第3条语句中，列名称和搜索值未用键值关系指定，所以生成的SQL不会添加引号，也不会转义。</p><h3 style="font-family:'Microsoft YaHei UI Light', SimHei, SimSun, sans-serif;line-height:1.1;color:rgb(66,139,209);">3.3 or</h3><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false;" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;overflow:auto;color:rgb(51,51,51);background-color:rgb(247,247,247);padding:1em;line-height:1.65;">['or', ['type' => [7, 8, 9]], ['id' => [1, 2, 3]]]
// 生成：(type IN (7, 8, 9) OR (id IN (1, 2, 3)))</pre><div class="contentsignin">Nach dem Login kopieren</div></div><h3 style="font-family:'Microsoft YaHei UI Light', SimHei, SimSun, sans-serif;line-height:1.1;color:rgb(66,139,209);">3.4 not</h3><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false;" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;overflow:auto;color:rgb(51,51,51);background-color:rgb(247,247,247);padding:1em;line-height:1.65;">['not', ['attribute' => null]]
// 生成：NOT (attribute IS NULL)</pre><div class="contentsignin">Nach dem Login kopieren</div></div><h3 style="font-family:'Microsoft YaHei UI Light', SimHei, SimSun, sans-serif;line-height:1.1;color:rgb(66,139,209);">3.5 between和not between</h3><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false;" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;overflow:auto;color:rgb(51,51,51);background-color:rgb(247,247,247);padding:1em;line-height:1.65;">['between', 'id', 1, 10]
// 生成：id BETWEEN 1 AND 10['not between', 'id', 1, 10]
// 生成：id NOT BETWEEN 1 AND 10</pre><div class="contentsignin">Nach dem Login kopieren</div></div><p style="white-space:pre-wrap;">运算符后面的运算数1为数据表<span style="font-weight:bolder;">列名称</span>，运算数2和运算数3分别为列值范围的<span style="font-weight:bolder;">最小值</span>和<span style="font-weight:bolder;">最大值</span>。</p><h3 style="font-family:'Microsoft YaHei UI Light', SimHei, SimSun, sans-serif;line-height:1.1;color:rgb(66,139,209);">3.6 in和not in</h3><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false;" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;overflow:auto;color:rgb(51,51,51);background-color:rgb(247,247,247);padding:1em;line-height:1.65;">['in', 'id', [1, 2, 3]]
// 生成：id IN (1, 2, 3)['not in', 'id', [1, 2, 3]]
// 生成：id NOT IN (1, 2, 3)</pre><div class="contentsignin">Nach dem Login kopieren</div></div><p style="white-space:pre-wrap;">运算符后面的<code class="hljs" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;">运算数1</code>为列名称或DB表达式，<code class="hljs" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;">运算数2</code>为数组，指定列值所在的范围。</p><p style="white-space:pre-wrap;">这个方法会为值添加引号，并正确转义。</p><p style="white-space:pre-wrap;">要生成混合<code class="hljs" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;">IN</code>条件，列名和列值都设置为数组，并且用列名为列值指定下标：</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="hljs php" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;overflow:auto;color:rgb(51,51,51);background-color:rgb(247,247,247);padding:1em;line-height:1.65;">['in', ['id', 'name'], [['id' => 1, 'name' => 'foo'], ['id' => 2, 'name' => 'bar']]] // 生成：(`id`, `name`) IN ((1, 'foo'), (2, 'bar'))</pre><div class="contentsignin">Nach dem Login kopieren</div></div><p style="white-space:pre-wrap;">另外，还可以用子查询作为<code class="hljs" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;">IN</code>条件的值，如下：</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="hljs coffeescript" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;overflow:auto;color:rgb(51,51,51);background-color:rgb(247,247,247);padding:1em;line-height:1.65;">['in', 'user_id', (new Query())->select('id')->from('users')->where(['active' => 1])]</pre><div class="contentsignin">Nach dem Login kopieren</div></div><h3 style="font-family:'Microsoft YaHei UI Light', SimHei, SimSun, sans-serif;line-height:1.1;color:rgb(66,139,209);">3.7 like</h3><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false;" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;overflow:auto;color:rgb(51,51,51);background-color:rgb(247,247,247);padding:1em;line-height:1.65;">['like', 'name', 'tester']
// 生成：name LIKE '%tester%'['like', 'name', ['test', 'sample']]
// 生成：name LIKE '%test%' AND name LIKE '%sample%'['like', 'name', '%tester', false]
// 生成：name LIKE '%tester'
// 这是自定义查询方式，要传入值为false的运算数3，并且自行添加%</pre><div class="contentsignin">Nach dem Login kopieren</div></div><p style="white-space:pre-wrap;"><span style="color:rgb(119,119,119);font-family:'courier new';"><span style="background-color:rgb(238,238,238);">运算数</span></span>后面的运算数1为列名称或DB表达式，运算数2为字符串或数组，指定列值查询条件。</p><p style="white-space:pre-wrap;">这个方法会为值添加引号，并正确转义。</p><p style="white-space:pre-wrap;"><code class="hljs coffeescript" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;"><span class="hljs-keyword" style="color:rgb(167,29,93);">or</span>
like</code>、<code class="hljs coffeescript" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;"><span class="hljs-keyword" style="color:rgb(167,29,93);">not</span>
like</code>、<code class="hljs coffeescript" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;"><span class="hljs-keyword" style="color:rgb(167,29,93);">or</span><span class="hljs-keyword" style="color:rgb(167,29,93);">not</span> like</code>用法和<code class="hljs" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;">like</code>一样。</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false;" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;overflow:auto;color:rgb(51,51,51);background-color:rgb(247,247,247);padding:1em;line-height:1.65;">['or like', 'name', ['test', 'sample']]
// 生成：name LIKE '%test%' OR name LIKE '%sample%'['not like', 'name', 'tester']
// 生成：name NOT LIKE '%tester%'['or not like', 'name', ['test', 'sample']]
// 生成：name NOT LIKE '%test%' OR name NOT LIKE '%sample%'</pre><div class="contentsignin">Nach dem Login kopieren</div></div><h3 style="font-family:'Microsoft YaHei UI Light', SimHei, SimSun, sans-serif;line-height:1.1;color:rgb(66,139,209);">3.8 exists</h3><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false;" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;overflow:auto;color:rgb(51,51,51);background-color:rgb(247,247,247);padding:1em;line-height:1.65;">['exists', (new Query())->select('id')->from('users')->where(['active' => 1])]
// 生成：EXISTS (SELECT "id" FROM "users" WHERE "active"=1)</pre><div class="contentsignin">Nach dem Login kopieren</div></div><p style="white-space:pre-wrap;"><code class="hljs perl" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;"><span class="hljs-keyword" style="color:rgb(167,29,93);">not</span><span class="hljs-keyword" style="color:rgb(167,29,93);">exists</span></code>用法和<code class="hljs perl" style="font-family:Consolas, 'Liberation Mono', Menlo, Courier, monospace;font-size:12px;padding:.3em;color:rgb(51,51,51);background-color:rgb(247,247,247);display:inline;line-height:1.65;"><span class="hljs-keyword" style="color:rgb(167,29,93);">exists</span></code>一样。</p>
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