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| <li class="toctree-l1 current"><a class="current reference internal" href="#">CREATE</a><ul> |
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| <div class="tex2jax_ignore mathjax_ignore section" id="create"> |
| <h1>CREATE<a class="headerlink" href="#create" title="Permalink to this headline">¶</a></h1> |
| <p>The CREATE clause is used to create graph vertices and edges.</p> |
| <div class="section" id="terminal-create-clauses"> |
| <h2>Terminal CREATE clauses<a class="headerlink" href="#terminal-create-clauses" title="Permalink to this headline">¶</a></h2> |
| <p>A create clause that is not followed by another clause is called a terminal clause. When a cypher query ends with a terminal clause, no results will be returned from the cypher function call. However, the cypher function call still requires a column list definition. When cypher ends with a terminal node, define a single value in the column list definition: no data will be returned in this variable.</p> |
| <p>Query</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span>SELECT * |
| FROM cypher('graph_name', $$ |
| CREATE /* Create clause here, no following clause */ |
| $$) as (a agtype); |
| </pre></div> |
| </div> |
| <table> |
| <tr> |
| <td><strong>a</strong> |
| </td> |
| </tr> |
| <tr> |
| <td>0 row(s) returned |
| </td> |
| </tr> |
| </table> |
| </div> |
| <div class="section" id="create-single-vertex"> |
| <h2>Create single vertex<a class="headerlink" href="#create-single-vertex" title="Permalink to this headline">¶</a></h2> |
| <p>Creating a single vertex is done by issuing the following query.</p> |
| <p>Query</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span>SELECT * |
| FROM cypher('graph_name', $$ |
| CREATE (n) |
| $$) as (v agtype); |
| </pre></div> |
| </div> |
| <p>Nothing is returned from this query.</p> |
| <table> |
| <tr> |
| <td><strong>v</strong> |
| </td> |
| </tr> |
| <tr> |
| <td>(0 rows) |
| </td> |
| </tr> |
| </table> |
| </div> |
| <div class="section" id="create-multiple-vertices"> |
| <h2>Create multiple vertices<a class="headerlink" href="#create-multiple-vertices" title="Permalink to this headline">¶</a></h2> |
| <p>Creating multiple vertices is done by separating them with a comma.</p> |
| <p>Query</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span>SELECT * |
| FROM cypher('graph_name', $$ |
| CREATE (n), (m) |
| $$) as (v agtype); |
| </pre></div> |
| </div> |
| <p>Result</p> |
| <table> |
| <tr> |
| <td><strong>a</strong> |
| </td> |
| </tr> |
| <tr> |
| <td>0 row(s) returned |
| </td> |
| </tr> |
| </table> |
| </div> |
| <div class="section" id="create-a-vertex-with-a-label"> |
| <h2>Create a vertex with a label<a class="headerlink" href="#create-a-vertex-with-a-label" title="Permalink to this headline">¶</a></h2> |
| <p>To add a label when creating a vertex, use the syntax below.</p> |
| <p>Query</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span>SELECT * |
| FROM cypher('graph_name', $$ |
| CREATE (:Person) |
| $$) as (v agtype); |
| </pre></div> |
| </div> |
| <p>Nothing is returned from this query.</p> |
| <p>Result</p> |
| <table> |
| <tr> |
| <td><strong>v</strong> |
| </td> |
| </tr> |
| <tr> |
| <td>0 row(s) returned |
| </td> |
| </tr> |
| </table> |
| </div> |
| <div class="section" id="create-vertex-and-add-labels-and-properties"> |
| <h2>Create vertex and add labels and properties<a class="headerlink" href="#create-vertex-and-add-labels-and-properties" title="Permalink to this headline">¶</a></h2> |
| <p>When creating a new vertex with labels, you can add properties at the same time.</p> |
| <p>Query</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span>SELECT * |
| FROM cypher('graph_name', $$ |
| CREATE (:Person {name: 'Andres', title: 'Developer') |
| $$) as (n agtype); |
| </pre></div> |
| </div> |
| <p>Nothing is returned from this query.</p> |
| <p>Result</p> |
| <table> |
| <tr> |
| <td><strong>n</strong> |
| </td> |
| </tr> |
| <tr> |
| <td>(0 rows) |
| </td> |
| </tr> |
| </table> |
| </div> |
| <div class="section" id="return-created-node"> |
| <h2>Return created node<a class="headerlink" href="#return-created-node" title="Permalink to this headline">¶</a></h2> |
| <p>Creating a single node is done by issuing the following query.</p> |
| <p>Query</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span>SELECT * |
| FROM cypher('graph_name', $$ |
| CREATE (a {name: 'Andres') |
| RETURN a |
| $$) as (a agtype); |
| </pre></div> |
| </div> |
| <p>The newly-created node is returned.</p> |
| <p>Result</p> |
| <table> |
| <tr> |
| <td><strong>a</strong> |
| </td> |
| </tr> |
| <tr> |
| <td>{id: 0; label: ‘’; properties: {name: ‘Andres’}}::vertex |
| </td> |
| </tr> |
| <tr> |
| <td>(1 row) |
| </td> |
| </tr> |
| </table> |
| </div> |
| <div class="section" id="create-an-edge-between-two-nodes"> |
| <h2>Create an edge between two nodes<a class="headerlink" href="#create-an-edge-between-two-nodes" title="Permalink to this headline">¶</a></h2> |
| <p>To create an edge between two vertices, we first get the two vertices. Once the nodes are loaded, we simply create an edge between them.</p> |
| <p>Query</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span>SELECT * |
| FROM cypher('graph_name', $$ |
| MATCH (a:Person), (b:Person) |
| WHERE a.name = 'Node A' AND b.name = 'Node B' |
| CREATE (a)-[e:RELTYPE]->(b) |
| RETURN e |
| $$) as (e agtype); |
| </pre></div> |
| </div> |
| <p>The created edge is returned by the query.</p> |
| <p>Result</p> |
| <table> |
| <tr> |
| <td><strong>e</strong> |
| </td> |
| </tr> |
| <tr> |
| <td>{id: 3; startid: 0, endid: 1; label: ‘RELTYPE’; properties: {}}::edge |
| </td> |
| </tr> |
| <tr> |
| <td>(1 row) |
| </td> |
| </tr> |
| </table> |
| </div> |
| <div class="section" id="create-an-edge-and-set-properties"> |
| <h2>Create an edge and set properties<a class="headerlink" href="#create-an-edge-and-set-properties" title="Permalink to this headline">¶</a></h2> |
| <p>Setting properties on edges is done in a similar manner to how it’s done when creating vertices. Note that the values can be any expression.</p> |
| <p>Query</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span>SELECT * |
| FROM cypher('graph_name', $$ |
| MATCH (a:Person), (b:Person) |
| WHERE a.name = 'Node A' AND b.name = 'Node B' |
| CREATE (a)-[e:RELTYPE {name:a.name + '<->' + b.name}]->(b) |
| RETURN e |
| $$) as (e agtype); |
| </pre></div> |
| </div> |
| <p>The newly-created edge is returned by the example query.</p> |
| <p>Result</p> |
| <table> |
| <tr> |
| <td><strong>e</strong> |
| </td> |
| </tr> |
| <tr> |
| <td>{id: 3; startid: 0, endid: 1; label: ‘RELTYPE’; properties: {name: ‘Node A<->Node B’}}::edge |
| </td> |
| </tr> |
| <tr> |
| <td>(1 row) |
| </td> |
| </tr> |
| </table> |
| </div> |
| <div class="section" id="create-a-full-path"> |
| <h2>Create a full path<a class="headerlink" href="#create-a-full-path" title="Permalink to this headline">¶</a></h2> |
| <p>v1 |
| When you use CREATE and a pattern, all parts of the pattern that are not already in scope at this time will be created.</p> |
| <p>Query</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span>SELECT * |
| FROM cypher('graph_name', $$ |
| CREATE p = (andres {name:'Andres'})-[:WORKS_AT]->(neo)<-[:WORKS_AT]-(michael {name:'Michael'}) |
| RETURN p |
| $$) as (p agtype); |
| </pre></div> |
| </div> |
| <p>This query creates three nodes and two relationships in one go, assigns it to a path variable, and returns it.</p> |
| <p>Result</p> |
| <table> |
| <tr> |
| <td><strong>p</strong></td> |
| </tr> |
| <tr> |
| <td> |
| [{id:0; label: ‘’; properties:{name:’Andres’}}::vertex, <br>{id: 3; startid: 0, endid: 1; label: ‘WORKS_AT’; properties: {}}::edge, <br>{id:1; label: ‘’; properties: {}}::vertex,<br>{id: 3; startid: 2, endid: 1; label: ‘WORKS_AT’; properties: {}}::edge,<br>{id:2; label: ‘’; properties: {name:’Michael’}}::vertex]::path |
| </td> |
| </tr> |
| <tr> |
| <td>(1 row) |
| </td> |
| </tr> |
| </table> |
| </div> |
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