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| <h1> |
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| <span class="sr-only">Apache Calcite Avatica</span> |
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| <div class="unit four-fifths"> |
| <article> |
| <h1>Go Client Reference</h1> |
| <!-- |
| |
| --> |
| |
| <p>The Avatica Go client is an Avatica driver for Go’s |
| <a href="https://golang.org/pkg/database/sql/">database/sql</a>package.</p> |
| |
| <p>It also works with the Phoenix Query Server from the Apache |
| Phoenix project, as the Phoenix Query Server uses Avatica under the |
| hood.</p> |
| |
| <ul id="markdown-toc"> |
| <li><a href="#getting-started" id="markdown-toc-getting-started">Getting Started</a></li> |
| <li><a href="#usage" id="markdown-toc-usage">Usage</a></li> |
| <li><a href="#dsn-data-source-name" id="markdown-toc-dsn-data-source-name">DSN (Data Source Name)</a></li> |
| <li><a href="#timetime-support" id="markdown-toc-timetime-support">time.Time support</a></li> |
| <li><a href="#apache-phoenix-error-codes" id="markdown-toc-apache-phoenix-error-codes">Apache Phoenix Error Codes</a></li> |
| <li><a href="#version-compatibility" id="markdown-toc-version-compatibility">Version Compatibility</a></li> |
| </ul> |
| |
| <h2 id="getting-started">Getting Started</h2> |
| <p>If you are using Go 1.10 and below, install using <a href="https://github.com/golang/dep">dep</a>:</p> |
| |
| <figure class="highlight"><pre><code class="language-shell" data-lang="shell"><span class="nv">$ </span>dep ensure <span class="nt">-add</span> github.com/apache/calcite-avatica-go</code></pre></figure> |
| |
| <p>If you are using Go 1.11 and above, install using Go modules:</p> |
| |
| <figure class="highlight"><pre><code class="language-shell" data-lang="shell"><span class="nv">$ </span>go get github.com/apache/calcite-avatica-go</code></pre></figure> |
| |
| <h2 id="usage">Usage</h2> |
| |
| <p>The Avatica Go driver implements Go’s <code class="highlighter-rouge">database/sql/driver</code> interface, so, import Go’s |
| <code class="highlighter-rouge">database/sql</code> package and the driver:</p> |
| |
| <figure class="highlight"><pre><code class="language-go" data-lang="go"><span class="k">import</span><span class="x"> </span><span class="s">"database/sql"</span><span class="x"> |
| </span><span class="k">import</span><span class="x"> </span><span class="n">_</span><span class="x"> </span><span class="s">"github.com/apache/calcite-avatica-go/v4"</span><span class="x"> |
| |
| </span><span class="n">db</span><span class="p">,</span><span class="x"> </span><span class="n">err</span><span class="x"> </span><span class="o">:=</span><span class="x"> </span><span class="n">sql</span><span class="o">.</span><span class="n">Open</span><span class="p">(</span><span class="s">"avatica"</span><span class="p">,</span><span class="x"> </span><span class="s">"http://localhost:8765"</span><span class="p">)</span></code></pre></figure> |
| |
| <p>Then simply use the database connection to query some data, for example:</p> |
| |
| <figure class="highlight"><pre><code class="language-go" data-lang="go"><span class="n">rows</span><span class="x"> </span><span class="o">:=</span><span class="x"> </span><span class="n">db</span><span class="o">.</span><span class="n">Query</span><span class="p">(</span><span class="s">"SELECT COUNT(*) FROM test"</span><span class="p">)</span></code></pre></figure> |
| |
| <h2 id="dsn-data-source-name">DSN (Data Source Name)</h2> |
| |
| <p>The DSN has the following format (optional parts are marked by square brackets):</p> |
| |
| <figure class="highlight"><pre><code class="language-shell" data-lang="shell">http://address:port[/schema][?parameter1<span class="o">=</span>value&...parameterN<span class="o">=</span>value]</code></pre></figure> |
| |
| <p>In other words, the scheme (http), address and port are mandatory, but the schema and parameters are optional.</p> |
| |
| <p><strong><a name="schema" href="#schema">schema</a></strong></p> |
| |
| <p>The <code class="highlighter-rouge">schema</code> path sets the default schema to use for this connection. For example, if you set it to <code class="highlighter-rouge">myschema</code>, |
| then executing the query <code class="highlighter-rouge">SELECT * FROM my_table</code> will have the equivalence of <code class="highlighter-rouge">SELECT * FROM myschema.my_table</code>. |
| If schema is set, you can still work on tables in other schemas by supplying a schema prefix: |
| <code class="highlighter-rouge">SELECT * FROM myotherschema.my_other_table</code>.</p> |
| |
| <p>The parameters references the options used by the Java implementation as much as possible. |
| The following parameters are supported:</p> |
| |
| <p><strong><a name="authentication" href="#authentication">authentication</a></strong></p> |
| |
| <p>The authentication type to use when authenticating against Avatica. Valid values are <code class="highlighter-rouge">BASIC</code> for HTTP Basic authentication, |
| <code class="highlighter-rouge">DIGEST</code> for HTTP Digest authentication, and <code class="highlighter-rouge">SPNEGO</code> for Kerberos with SPNEGO authentication.</p> |
| |
| <p><strong><a name="avaticaUser" href="#avaticaUser">avaticaUser</a></strong></p> |
| |
| <p>The user to use when authenticating against Avatica. This parameter is required if <code class="highlighter-rouge">authentication</code> is <code class="highlighter-rouge">BASIC</code> or <code class="highlighter-rouge">DIGEST</code>.</p> |
| |
| <p><strong><a name="avaticaPassword" href="#avaticaPassword">avaticaPassword</a></strong></p> |
| |
| <p>The password to use when authenticating against Avatica. This parameter is required if <code class="highlighter-rouge">authentication</code> is <code class="highlighter-rouge">BASIC</code> or <code class="highlighter-rouge">DIGEST</code>.</p> |
| |
| <p><strong><a name="principal" href="#principal">principal</a></strong></p> |
| |
| <p>The Kerberos principal to use when authenticating against Avatica. It should be in the form <code class="highlighter-rouge">primary/instance@realm</code>, where |
| the instance is optional. This parameter is required if <code class="highlighter-rouge">authentication</code> is <code class="highlighter-rouge">SPNEGO</code> and you want the driver to perform the |
| Kerberos login.</p> |
| |
| <p><strong><a name="keytab" href="#keytab">keytab</a></strong></p> |
| |
| <p>The path to the Kerberos keytab to use when authenticating against Avatica. This parameter is required if <code class="highlighter-rouge">authentication</code> |
| is <code class="highlighter-rouge">SPNEGO</code> and you want the driver to perform the Kerberos login.</p> |
| |
| <p><strong><a name="krb5Conf" href="#krb5Conf">krb5Conf</a></strong></p> |
| |
| <p>The path to the Kerberos configuration to use when authenticating against Avatica. This parameter is required if <code class="highlighter-rouge">authentication</code> |
| is <code class="highlighter-rouge">SPNEGO</code> and you want the driver to perform the Kerberos login.</p> |
| |
| <p><strong><a name="krb5CredentialsCache" href="#krb5CredentialsCache">krb5CredentialsCache</a></strong></p> |
| |
| <p>The path to the Kerberos credential cache file to use when authenticating against Avatica. This parameter is required if |
| <code class="highlighter-rouge">authentication</code> is <code class="highlighter-rouge">SPNEGO</code> and you have logged into Kerberos already and want the driver to use the existing credentials.</p> |
| |
| <p><strong><a name="location" href="#location">location</a></strong></p> |
| |
| <p>The <code class="highlighter-rouge">location</code> will be set as the location of unserialized <code class="highlighter-rouge">time.Time</code> values. It must be a valid timezone. |
| If you want to use the local timezone, use <code class="highlighter-rouge">Local</code>. By default, this is set to <code class="highlighter-rouge">UTC</code>.</p> |
| |
| <p><strong><a name="maxRowsTotal" href="#maxRowsTotal">maxRowsTotal</a></strong></p> |
| |
| <p>The <code class="highlighter-rouge">maxRowsTotal</code> parameter sets the maximum number of rows to return for a given query. By default, this is set to |
| <code class="highlighter-rouge">-1</code>, so that there is no limit on the number of rows returned.</p> |
| |
| <p><strong><a name="frameMaxSize" href="#frameMaxSize">frameMaxSize</a></strong></p> |
| |
| <p>The <code class="highlighter-rouge">frameMaxSize</code> parameter sets the maximum number of rows to return in a frame. Depending on the number of rows |
| returned and subject to the limits of <code class="highlighter-rouge">maxRowsTotal</code>, a query result set can contain rows in multiple frames. These |
| additional frames are then fetched on a as-needed basis. <code class="highlighter-rouge">frameMaxSize</code> allows you to control the number of rows |
| in each frame to suit your application’s performance profile. By default this is set to <code class="highlighter-rouge">-1</code>, so that there is no limit |
| on the number of rows in a frame.</p> |
| |
| <p><strong><a name="transactionIsolation" href="#transactionIsolation">transactionIsolation</a></strong></p> |
| |
| <p>Setting <code class="highlighter-rouge">transactionIsolation</code> allows you to set the isolation level for transactions using the connection. The value |
| should be a positive integer analogous to the transaction levels defined by the JDBC specification. The default value |
| is <code class="highlighter-rouge">0</code>, which means transactions are not supported. This is to deal with the fact that Calcite/Avatica works with |
| many types of backends, with some backends having no transaction support. If you are using Apache Phoenix 4.7 onwards, |
| we recommend setting it to <code class="highlighter-rouge">4</code>, which is the maximum isolation level supported.</p> |
| |
| <p>The supported values for <code class="highlighter-rouge">transactionIsolation</code> are:</p> |
| |
| <table> |
| <thead> |
| <tr> |
| <th style="text-align: left">Value</th> |
| <th style="text-align: left">JDBC Constant</th> |
| <th style="text-align: left">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td style="text-align: left">0</td> |
| <td style="text-align: left">none</td> |
| <td style="text-align: left">Transactions are not supported</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">1</td> |
| <td style="text-align: left"><code class="highlighter-rouge">TRANSACTION_READ_UNCOMMITTED</code></td> |
| <td style="text-align: left">Dirty reads, non-repeatable reads and phantom reads may occur.</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">2</td> |
| <td style="text-align: left"><code class="highlighter-rouge">TRANSACTION_READ_COMMITTED</code></td> |
| <td style="text-align: left">Dirty reads are prevented, but non-repeatable reads and phantom reads may occur.</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">4</td> |
| <td style="text-align: left"><code class="highlighter-rouge">TRANSACTION_REPEATABLE_READ</code></td> |
| <td style="text-align: left">Dirty reads and non-repeatable reads are prevented, but phantom reads may occur.</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">8</td> |
| <td style="text-align: left"><code class="highlighter-rouge">TRANSACTION_SERIALIZABLE</code></td> |
| <td style="text-align: left">Dirty reads, non-repeatable reads, and phantom reads are all prevented.</td> |
| </tr> |
| </tbody> |
| </table> |
| |
| <h2 id="timetime-support">time.Time support</h2> |
| |
| <p>The following datatypes are automatically converted to and from <code class="highlighter-rouge">time.Time</code>: |
| <code class="highlighter-rouge">TIME</code>, <code class="highlighter-rouge">DATE</code> and <code class="highlighter-rouge">TIMESTAMP</code>.</p> |
| |
| <p>It is important to understand that Avatica and the underlying database ignores the timezone. If you save a <code class="highlighter-rouge">time.Time</code> |
| to the database, the timezone is ignored and vice-versa. This is why you need to make sure the <code class="highlighter-rouge">location</code> parameter |
| in your DSN is set to the same value as the location of the <code class="highlighter-rouge">time.Time</code> values you are inserting into the database.</p> |
| |
| <p>We recommend using <code class="highlighter-rouge">UTC</code>, which is the default value of <code class="highlighter-rouge">location</code>.</p> |
| |
| <h2 id="apache-phoenix-error-codes">Apache Phoenix Error Codes</h2> |
| <p>The Go client comes with support for retrieving the error code when an error occurs. This is extremely useful when |
| you want to take specific action when a particular type of error occurs.</p> |
| |
| <p>If the error returned is a ResponseError, the <code class="highlighter-rouge">Name</code> field on the error will return the appropriate |
| Apache Phoenix error code:</p> |
| |
| <figure class="highlight"><pre><code class="language-go" data-lang="go"><span class="n">_</span><span class="p">,</span><span class="x"> </span><span class="n">err</span><span class="x"> </span><span class="o">:=</span><span class="x"> </span><span class="n">db</span><span class="o">.</span><span class="n">Exec</span><span class="p">(</span><span class="s">"SELECT * FROM table_that_does_not_exist"</span><span class="p">)</span><span class="x"> </span><span class="c">// Query undefined table</span><span class="x"> |
| |
| </span><span class="c">// First, assert the error type</span><span class="x"> |
| </span><span class="n">perr</span><span class="p">,</span><span class="x"> </span><span class="n">ok</span><span class="x"> </span><span class="o">:=</span><span class="x"> </span><span class="n">err</span><span class="o">.</span><span class="p">(</span><span class="n">avatica</span><span class="o">.</span><span class="n">ResponseError</span><span class="p">)</span><span class="x"> |
| |
| </span><span class="c">// If it cannot be asserted</span><span class="x"> |
| </span><span class="k">if</span><span class="x"> </span><span class="o">!</span><span class="n">ok</span><span class="x"> </span><span class="p">{</span><span class="x"> |
| </span><span class="c">// Error was not an Avatica ResponseError</span><span class="x"> |
| </span><span class="p">}</span><span class="x"> |
| |
| </span><span class="c">// Print the Apache Phoenix error code</span><span class="x"> |
| </span><span class="n">fmt</span><span class="o">.</span><span class="n">Println</span><span class="p">(</span><span class="n">perr</span><span class="o">.</span><span class="n">Name</span><span class="p">)</span><span class="x"> </span><span class="c">// Prints: table_undefined</span></code></pre></figure> |
| |
| <h2 id="version-compatibility">Version Compatibility</h2> |
| |
| <table> |
| <thead> |
| <tr> |
| <th style="text-align: left">Driver Version</th> |
| <th style="text-align: left">Phoenix Version</th> |
| <th style="text-align: left">Calcite-Avatica Version</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td style="text-align: left">3.x.x</td> |
| <td style="text-align: left">>= 4.8.0</td> |
| <td style="text-align: left">>= 1.11.0</td> |
| </tr> |
| </tbody> |
| </table> |
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| <h4>Overview</h4> |
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