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Lu, Huayi
e6fa411af0
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com> Co-authored-by: Lu, Huayi <luhuayi@huawei.com> Co-committed-by: Lu, Huayi <luhuayi@huawei.com>
119 lines
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119 lines
8.7 KiB
HTML
<a name="EN-US_TOPIC_0000001188482314"></a><a name="EN-US_TOPIC_0000001188482314"></a>
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<h1 class="topictitle1">RETURN</h1>
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<div id="body1551664498139"><div class="section" id="EN-US_TOPIC_0000001188482314__s5c09b14a50ff4d97952f11938bea7e6a"><h4 class="sectiontitle">Syntax</h4><p id="EN-US_TOPIC_0000001188482314__ae13e2b897d5843bc8739b5c0dde95b7d"><a href="#EN-US_TOPIC_0000001188482314__fa40a1c0c0b6f4aba8952d533d6f111a5">Figure 1</a> shows the syntax diagram for a return statement.</p>
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<div class="fignone" id="EN-US_TOPIC_0000001188482314__fa40a1c0c0b6f4aba8952d533d6f111a5"><a name="EN-US_TOPIC_0000001188482314__fa40a1c0c0b6f4aba8952d533d6f111a5"></a><a name="fa40a1c0c0b6f4aba8952d533d6f111a5"></a><span class="figcap"><b>Figure 1 </b>return_clause::=</span><br><span><img id="EN-US_TOPIC_0000001188482314__i92270c9f1f3e417eaf71aa53616f7ddb" src="figure/en-us_image_0000001188642286.jpg"></span></div>
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<p id="EN-US_TOPIC_0000001188482314__af0201a8e23ea4e4ba378b18f2a924d7e">The syntax details are as follows:</p>
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<p id="EN-US_TOPIC_0000001188482314__a31509f685ed94edc809af7ec1d5ed652">This statement returns control from a stored procedure or function to a caller.</p>
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</div>
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<div class="section" id="EN-US_TOPIC_0000001188482314__section11628101012578"><h4 class="sectiontitle">Example</h4><div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001188482314__screen03641753193915"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal"> 1</span>
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<span class="normal">50</span></pre></div></td><td class="code"><div><pre><span></span><span class="c1">-- Create the stored procedure proc_staffs:</span>
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<span class="k">CREATE</span><span class="w"> </span><span class="k">OR</span><span class="w"> </span><span class="k">REPLACE</span><span class="w"> </span><span class="k">PROCEDURE</span><span class="w"> </span><span class="n">proc_staffs</span>
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<span class="p">(</span>
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<span class="n">section</span><span class="w"> </span><span class="nb">NUMBER</span><span class="p">(</span><span class="mi">6</span><span class="p">),</span>
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<span class="n">salary_sum</span><span class="w"> </span><span class="k">out</span><span class="w"> </span><span class="nb">NUMBER</span><span class="p">(</span><span class="mi">8</span><span class="p">,</span><span class="mi">2</span><span class="p">),</span>
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<span class="n">staffs_count</span><span class="w"> </span><span class="k">out</span><span class="w"> </span><span class="nb">INTEGER</span>
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<span class="p">)</span>
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<span class="k">IS</span>
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<span class="k">BEGIN</span>
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<span class="k">SELECT</span><span class="w"> </span><span class="k">sum</span><span class="p">(</span><span class="n">salary</span><span class="p">),</span><span class="w"> </span><span class="k">count</span><span class="p">(</span><span class="o">*</span><span class="p">)</span><span class="w"> </span><span class="k">INTO</span><span class="w"> </span><span class="n">salary_sum</span><span class="p">,</span><span class="w"> </span><span class="n">staffs_count</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">staffs</span><span class="w"> </span><span class="k">where</span><span class="w"> </span><span class="n">section_id</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">section</span><span class="p">;</span>
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<span class="k">END</span><span class="p">;</span>
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<span class="o">/</span>
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<span class="c1">-- Create the stored procedure proc_return:</span>
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<span class="k">CREATE</span><span class="w"> </span><span class="k">OR</span><span class="w"> </span><span class="k">REPLACE</span><span class="w"> </span><span class="k">PROCEDURE</span><span class="w"> </span><span class="n">proc_return</span>
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<span class="k">AS</span>
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<span class="n">v_num</span><span class="w"> </span><span class="nb">NUMBER</span><span class="p">(</span><span class="mi">8</span><span class="p">,</span><span class="mi">2</span><span class="p">);</span>
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<span class="n">v_sum</span><span class="w"> </span><span class="nb">INTEGER</span><span class="p">;</span>
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<span class="k">BEGIN</span>
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<span class="n">proc_staffs</span><span class="p">(</span><span class="mi">30</span><span class="p">,</span><span class="w"> </span><span class="n">v_sum</span><span class="p">,</span><span class="w"> </span><span class="n">v_num</span><span class="p">);</span><span class="w"> </span><span class="c1">--Invoke a statement</span>
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<span class="n">dbms_output</span><span class="p">.</span><span class="n">put_line</span><span class="p">(</span><span class="n">v_sum</span><span class="o">||</span><span class="s1">'#'</span><span class="o">||</span><span class="n">v_num</span><span class="p">);</span>
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<span class="k">RETURN</span><span class="p">;</span><span class="w"> </span><span class="c1">--Return a statement</span>
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<span class="k">END</span><span class="p">;</span>
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<span class="o">/</span>
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<span class="c1">-- Invoke a stored procedure proc_return:</span>
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<span class="k">CALL</span><span class="w"> </span><span class="n">proc_return</span><span class="p">();</span>
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<span class="c1">-- Delete a stored procedure:</span>
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<span class="k">DROP</span><span class="w"> </span><span class="k">PROCEDURE</span><span class="w"> </span><span class="n">proc_staffs</span><span class="p">;</span>
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<span class="k">DROP</span><span class="w"> </span><span class="k">PROCEDURE</span><span class="w"> </span><span class="n">proc_return</span><span class="p">;</span>
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<span class="c1">--Create the function func_return.</span>
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<span class="k">CREATE</span><span class="w"> </span><span class="k">OR</span><span class="w"> </span><span class="k">REPLACE</span><span class="w"> </span><span class="k">FUNCTION</span><span class="w"> </span><span class="n">func_return</span><span class="w"> </span><span class="k">returns</span><span class="w"> </span><span class="n">void</span>
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<span class="k">language</span><span class="w"> </span><span class="n">plpgsql</span>
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<span class="k">AS</span><span class="w"> </span><span class="err">$$</span>
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<span class="k">DECLARE</span>
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<span class="n">v_num</span><span class="w"> </span><span class="nb">INTEGER</span><span class="w"> </span><span class="p">:</span><span class="o">=</span><span class="w"> </span><span class="mi">1</span><span class="p">;</span>
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<span class="k">BEGIN</span>
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<span class="n">dbms_output</span><span class="p">.</span><span class="n">put_line</span><span class="p">(</span><span class="n">v_num</span><span class="p">);</span>
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<span class="k">RETURN</span><span class="p">;</span><span class="w"> </span><span class="c1">--Return a statement</span>
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<span class="k">END</span><span class="w"> </span><span class="err">$$</span><span class="p">;</span>
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<span class="c1">-- Invoke the function func_return.</span>
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<span class="k">CALL</span><span class="w"> </span><span class="n">func_return</span><span class="p">();</span>
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<span class="mi">1</span>
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<span class="c1">-- Delete the function:</span>
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<span class="k">DROP</span><span class="w"> </span><span class="k">FUNCTION</span><span class="w"> </span><span class="n">func_return</span><span class="p">;</span>
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</pre></div></td></tr></table></div>
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</div>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="dws_04_0533.html">RETURN Statements</a></div>
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</div>
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</div>
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