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class="docItemContainer_c0TR"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Lakehouse</span><meta itemprop="position" content="1"></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Analyzing Database</span><meta itemprop="position" content="2"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">JDBC Catalog</span><meta itemprop="position" content="3"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>JDBC Catalog</h1></header><p>Doris JDBC Catalog supports connecting to different databases that support the JDBC protocol through the standard JDBC interface. This document introduces the general configuration and usage of JDBC Catalog.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="supported-databases">Supported databases<a href="#supported-databases" class="hash-link" aria-label="Direct link to Supported databases" title="Direct link to Supported databases"></a></h2><p>Doris JDBC Catalog supports connecting to the following databases:</p><table><thead><tr><th>Database</th><th>Description</th></tr></thead><tbody><tr><td><a href="/docs/2.0/lakehouse/database/mysql">MySQL</a></td><td></td></tr><tr><td><a href="/docs/2.0/lakehouse/database/postgresql">PostgreSQL</a></td><td></td></tr><tr><td><a href="/docs/2.0/lakehouse/database/oracle">Oracle</a></td><td></td></tr><tr><td><a href="/docs/2.0/lakehouse/database/sqlserver">SQL Server</a></td><td></td></tr><tr><td><a href="/docs/2.0/lakehouse/database/clickhouse">ClickHouse</a></td><td></td></tr><tr><td><a href="/docs/2.0/lakehouse/database/sap-hana">SAP HANA</a></td><td></td></tr><tr><td><a href="/docs/2.0/lakehouse/database/oceanbase">OceanBase</a></td><td></td></tr></tbody></table><h2 class="anchor anchorWithStickyNavbar_LWe7" id="configuration">Configuration<a href="#configuration" class="hash-link" aria-label="Direct link to Configuration" title="Direct link to Configuration"></a></h2><h3 class="anchor anchorWithStickyNavbar_LWe7" id="basic-properties">Basic properties<a href="#basic-properties" class="hash-link" aria-label="Direct link to Basic properties" title="Direct link to Basic properties"></a></h3><table><thead><tr><th>Parameters</th><th>Description</th></tr></thead><tbody><tr><td><code>type</code></td><td>Fixed to <code>jdbc</code></td></tr><tr><td><code>user</code></td><td>Data source user name</td></tr><tr><td><code>password</code></td><td>Data source password</td></tr><tr><td><code>jdbc_url</code></td><td>Data source connection URL</td></tr><tr><td><code>driver_url</code></td><td>Path to the data source JDBC driver</td></tr><tr><td><code>driver_class</code></td><td>The class name of the data source JDBC driver</td></tr></tbody></table><h3 class="anchor anchorWithStickyNavbar_LWe7" id="optional-properties">Optional properties<a href="#optional-properties" class="hash-link" aria-label="Direct link to Optional properties" title="Direct link to Optional properties"></a></h3><table><thead><tr><th>Parameters</th><th>Default value</th><th>Description</th></tr></thead><tbody><tr><td><code>lower_case_table_names</code></td><td>&quot;false&quot;</td><td>Whether to synchronize the library name and table name of jdbc external data source in lowercase</td></tr><tr><td><code>only_specified_database</code></td><td>&quot;false&quot;</td><td>Whether to synchronize only the Database of the data source specified in the JDBC URL (Database here is the Database level mapped to Doris)</td></tr><tr><td><code>include_database_list</code></td><td>&quot;&quot;</td><td>When <code>only_specified_database=true</code>, specify to synchronize multiple Databases, separated by &#x27;,&#x27;. Database names are case-sensitive.</td></tr><tr><td><code>exclude_database_list</code></td><td>&quot;&quot;</td><td>When <code>only_specified_database=true</code>, specify multiple Databases that do not need to be synchronized, separated by &#x27;,&#x27;. Database names are case-sensitive.</td></tr></tbody></table><h3 class="anchor anchorWithStickyNavbar_LWe7" id="connection-pool-properties">Connection pool properties<a href="#connection-pool-properties" class="hash-link" aria-label="Direct link to Connection pool properties" title="Direct link to Connection pool properties"></a></h3><table><thead><tr><th>Parameter</th><th>Default value</th><th>Description</th></tr></thead><tbody><tr><td><code>connection_pool_min_size</code></td><td>1</td><td>Defines the minimum number of connections in the connection pool, which is used to initialize the connection pool and ensure that at least this number of connections are active when the keep-alive mechanism is enabled.</td></tr><tr><td><code>connection_pool_max_size</code></td><td>10</td><td>Defines the maximum number of connections in the connection pool. Each FE or BE node corresponding to each Catalog can hold up to this number of connections.</td></tr><tr><td><code>connection_pool_max_wait_time</code></td><td>5000</td><td>Defines the maximum number of milliseconds the client will wait for a connection if there is no available connection in the connection pool.</td></tr><tr><td><code>connection_pool_max_life_time</code></td><td>1800000</td><td>Set the maximum time (in milliseconds) that a connection remains active in the connection pool. Timed out connections will be recycled. At the same time, half of this value will serve as the minimum eviction idle time of the connection pool, and connections that reach this time will become eviction candidates.</td></tr><tr><td><code>connection_pool_keep_alive</code></td><td>false</td><td>Only valid on BE nodes, used to decide whether to keep connections that have reached the minimum eviction idle time but have not reached the maximum lifetime active. Turned off by default to reduce unnecessary resource usage.</td></tr></tbody></table><h2 class="anchor anchorWithStickyNavbar_LWe7" id="property-notes">Property Notes<a href="#property-notes" class="hash-link" aria-label="Direct link to Property Notes" title="Direct link to Property Notes"></a></h2><h3 class="anchor anchorWithStickyNavbar_LWe7" id="driver-package-path-and-security">Driver package path and security<a href="#driver-package-path-and-security" class="hash-link" aria-label="Direct link to Driver package path and security" title="Direct link to Driver package path and security"></a></h3><p><code>driver_url</code> can be specified in the following three ways:</p><ol><li><p>File name. Such as <code>mysql-connector-j-8.3.0.jar</code>. The Jar package needs to be pre-stored in <code>jdbc_drivers/</code> under the FE and BE deployment directories.
 Under contents. The system will automatically search in this directory. The location of this directory can also be modified by the <code>jdbc_drivers_dir</code> configuration in fe.conf and be.conf.</p></li><li><p>Local absolute path. Such as <code>file:///path/to/mysql-connector-j-8.3.0.jar</code>. Jar packages need to be stored in the paths specified by all FE/BE nodes in advance.</p></li><li><p>HTTP address. For example: <a href="http://repo1.maven.org/maven2/com/mysql/mysql-connector-j/8.3.0/mysql-connector-j-8.3.0.jar" target="_blank" rel="noopener noreferrer">http://repo1.maven.org/maven2/com/mysql/mysql-connector-j/8.3.0/mysql-connector-j-8.3.0.jar</a> The system will download the Driver file from this Http address. Only HTTP services without authentication are supported.</p></li></ol><p><strong>Driver package security</strong></p><p>In order to prevent the use of a Driver Jar package with an unallowed path when creating the Catalog, Doris will perform path management and checksum checking on the Jar package.</p><ol><li><p>For the above method 1, the <code>jdbc_drivers_dir</code> configured by the Doris default user and all Jar packages in its directory are safe and will not be path checked.</p></li><li><p>For the above methods 2 and 3, Doris will check the source of the Jar package. The checking rules are as follows:</p><ul><li>Control the allowed driver package paths through the FE configuration item <code>jdbc_driver_secure_path</code>. This configuration item can configure multiple paths, separated by semicolons. When this option is configured, Doris
 It will check whether the partial prefix of the path of driver_url in Catalog properties is in <code>jdbc_driver_secure_path</code>. If it is not in it, the creation will be refused.
 Catalog.</li><li>This parameter defaults to <code>*</code>, which means Jar packages of all paths are allowed.</li><li>If the configuration <code>jdbc_driver_secure_path</code> is empty, it also means that Jar packages of all paths are allowed.</li></ul><div class="theme-admonition theme-admonition-info alert alert--info admonition_LlT9"><div class="admonitionHeading_tbUL"><span class="admonitionIcon_kALy"><svg viewBox="0 0 14 16"><path fill-rule="evenodd" d="M7 2.3c3.14 0 5.7 2.56 5.7 5.7s-2.56 5.7-5.7 5.7A5.71 5.71 0 0 1 1.3 8c0-3.14 2.56-5.7 5.7-5.7zM7 1C3.14 1 0 4.14 0 8s3.14 7 7 7 7-3.14 7-7-3.14-7-7-7zm1 3H6v5h2V4zm0 6H6v2h2v-2z"></path></svg></span>remarks</div><div class="admonitionContent_S0QG"><p>For example, configure <code>jdbc_driver_secure_path = &quot;file:///path/to/jdbc_drivers;http://path/to/jdbc_drivers&quot;</code>:</p><p>Then only driver package paths starting with <code>file:///path/to/jdbc_drivers</code> or <code>http://path/to/jdbc_drivers</code> are allowed.</p></div></div></li><li><p>When creating a Catalog, you can specify the checksum of the driver package through the <code>checksum</code> parameter. Doris will verify the driver package after loading the driver package. If the verification fails, the creation will be rejected.
 Catalog.</p></li></ol><div class="theme-admonition theme-admonition-info alert alert--info admonition_LlT9"><div class="admonitionHeading_tbUL"><span class="admonitionIcon_kALy"><svg viewBox="0 0 14 16"><path fill-rule="evenodd" d="M7 2.3c3.14 0 5.7 2.56 5.7 5.7s-2.56 5.7-5.7 5.7A5.71 5.71 0 0 1 1.3 8c0-3.14 2.56-5.7 5.7-5.7zM7 1C3.14 1 0 4.14 0 8s3.14 7 7 7 7-3.14 7-7-3.14-7-7-7zm1 3H6v5h2V4zm0 6H6v2h2v-2z"></path></svg></span>remarks</div><div class="admonitionContent_S0QG"><p>The above verification will only be performed when the catalog is created, and the already created catalog will not be verified again.</p></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="lowercase-name-synchronization">Lowercase name synchronization<a href="#lowercase-name-synchronization" class="hash-link" aria-label="Direct link to Lowercase name synchronization" title="Direct link to Lowercase name synchronization"></a></h3><p>When <code>lower_case_table_names</code> is set to <code>true</code>, Doris is able to query non-lowercase databases and tables by maintaining a mapping of lowercase names to actual names on the remote system</p><p><strong>Notice:</strong></p><ol><li><p>In versions before Doris 2.0.3, it is only valid for Oracle database. When querying, all library names and table names will be converted to uppercase before querying Oracle, for example:</p><p>Oracle has the TEST table in the TEST space. When Doris creates the Catalog, set <code>lower_case_table_names</code> to <code>true</code>, then Doris can query the TEST table through <code>select * from oracle_catalog.test.test</code>, and Doris will automatically format test.test into TEST.TEST is sent to Oracle. It should be noted that this is the default behavior, which also means that lowercase table names in Oracle cannot be queried.</p><p>For other databases, you still need to specify the real library name and table name when querying.</p></li><li><p>In Doris 2.0.3 and later 2.0.x versions, it is valid for all databases. When querying, all library names and table names will be converted into real names and then queried. If you upgrade from an old version To 2.0.3, <code>Refresh &lt;catalog_name&gt;</code> is required to take effect.</p><p>However, if the database or table names differ only in case, such as <code>Doris</code> and <code>doris</code>, Doris cannot query them due to ambiguity.</p></li><li><p>When the <code>lower_case_table_names</code> parameter of the FE parameter is set to <code>1</code> or <code>2</code>, the <code>lower_case_table_names</code> parameter of the JDBC Catalog must be set to <code>true</code>. If the <code>lower_case_table_names</code> of the FE parameter is set to <code>0</code>, the JDBC Catalog parameter can be <code>true</code> or <code>false</code>, defaulting to <code>false</code>. This ensures consistency and predictability in how Doris handles internal and external table configurations.</p></li></ol><h3 class="anchor anchorWithStickyNavbar_LWe7" id="specify-synchronization-database">Specify synchronization database<a href="#specify-synchronization-database" class="hash-link" aria-label="Direct link to Specify synchronization database" title="Direct link to Specify synchronization database"></a></h3><p><code>only_specified_database</code>:
 Whether to synchronize only the Database of the data source specified in the JDBC URL. The default value is <code>false</code>, which means synchronizing all Databases in the JDBC URL.</p><p><code>include_database_list</code>:
 Only effective when <code>only_specified_database=true</code>, specify the Schema of PostgreSQL that needs to be synchronized, separated by &#x27;,&#x27;. Schema names are case-sensitive.</p><p><code>exclude_database_list</code>:
 Only effective when <code>only_specified_database=true</code>, specify the Schema of PostgreSQL that does not need to be synchronized, separated by &#x27;,&#x27;. Schema names are case-sensitive.</p><div class="theme-admonition theme-admonition-info alert alert--info admonition_LlT9"><div class="admonitionHeading_tbUL"><span class="admonitionIcon_kALy"><svg viewBox="0 0 14 16"><path fill-rule="evenodd" d="M7 2.3c3.14 0 5.7 2.56 5.7 5.7s-2.56 5.7-5.7 5.7A5.71 5.71 0 0 1 1.3 8c0-3.14 2.56-5.7 5.7-5.7zM7 1C3.14 1 0 4.14 0 8s3.14 7 7 7 7-3.14 7-7-3.14-7-7-7zm1 3H6v5h2V4zm0 6H6v2h2v-2z"></path></svg></span>remarks</div><div class="admonitionContent_S0QG"><ul><li>The Database mentioned in the above three parameters refers to the Database level in Doris, not the Database level of external data sources. For specific mapping relationships, please refer to each data source document.</li><li>When <code>include_database_list</code> and <code>exclude_database_list</code> have overlapping database configurations, <code>exclude_database_list</code> will take effect first.</li></ul></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="connection-pool-configuration">Connection pool configuration<a href="#connection-pool-configuration" class="hash-link" aria-label="Direct link to Connection pool configuration" title="Direct link to Connection pool configuration"></a></h3><p>In Doris, each FE and BE node maintains a connection pool, which avoids frequently opening and closing separate data source connections. Each connection in the connection pool can be used to establish a connection with the data source and execute queries. When the task is completed, these connections are returned to the pool for reuse, which not only improves performance, but also reduces the overhead of establishing connections and helps prevent the data source&#x27;s connection limit from being reached.</p><p>The connection pool size can be adjusted to better suit your workload. Typically, the minimum number of connections in a connection pool should be set to 1 to ensure that at least one connection is active when the keepalive mechanism is enabled. The maximum number of connections in the connection pool should be set to a reasonable value to avoid too many connections occupying resources.</p><p>At the same time, in order to avoid accumulating too many unused connection pool caches on BE, you can specify the time interval for clearing the cache by setting the <code>jdbc_connection_pool_cache_clear_time_sec</code> parameter of BE. The default value is 28800 seconds (8 hours). After this interval, BE will forcefully clear all connection pool caches that have not been used for more than this time.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="insert-transaction">Insert transaction<a href="#insert-transaction" class="hash-link" aria-label="Direct link to Insert transaction" title="Direct link to Insert transaction"></a></h3><p>Doris&#x27; data is written to the JDBC Catalog in a batch manner. If the import is interrupted midway, the previously written data may need to be rolled back. Therefore, JDBC Catalog supports transactions when data is written. Transaction support needs to be set by setting session variable: <code>enable_odbc_transcation</code>.</p><div class="language-sql codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-sql codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">set</span><span class="token plain"> enable_odbc_transcation </span><span class="token operator">=</span><span class="token plain"> </span><span class="token boolean">true</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>Transactions ensure the atomicity of JDBC Catalog data writing, but will reduce the performance of data writing to a certain extent. You can consider turning on this function as appropriate.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="example">Example<a href="#example" class="hash-link" aria-label="Direct link to Example" title="Direct link to Example"></a></h2><p>Here, MySQL is used as an example to show how to create a MySQL Catalog and query the data in it.</p><p>Create a Catalog named <code>mysql</code>:</p><div class="language-sql codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-sql codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">CREATE</span><span class="token plain"> CATALOG mysql PROPERTIES </span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">    </span><span class="token string" style="color:rgb(255, 121, 198)">&quot;type&quot;</span><span class="token operator">=</span><span class="token string" style="color:rgb(255, 121, 198)">&quot;jdbc&quot;</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">    </span><span class="token string" style="color:rgb(255, 121, 198)">&quot;user&quot;</span><span class="token operator">=</span><span class="token string" style="color:rgb(255, 121, 198)">&quot;root&quot;</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">    </span><span class="token string" style="color:rgb(255, 121, 198)">&quot;password&quot;</span><span class="token operator">=</span><span class="token string" style="color:rgb(255, 121, 198)">&quot;secret&quot;</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">    </span><span class="token string" style="color:rgb(255, 121, 198)">&quot;jdbc_url&quot;</span><span class="token plain"> </span><span class="token operator">=</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">&quot;jdbc:mysql://example.net:3306&quot;</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">    </span><span class="token string" style="color:rgb(255, 121, 198)">&quot;driver_url&quot;</span><span class="token plain"> </span><span class="token operator">=</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">&quot;mysql-connector-j-8.3.0.jar&quot;</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">    </span><span class="token string" style="color:rgb(255, 121, 198)">&quot;driver_class&quot;</span><span class="token plain"> </span><span class="token operator">=</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">&quot;com.mysql.cj.jdbc.Driver&quot;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>View all databases in this catalog by running SHOW DATABASES:</p><div class="language-sql codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-sql codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">SHOW</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">DATABASES</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">FROM</span><span class="token plain"> mysql</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>If you have a MySQL database named test, you can view the tables in that database by running SHOW TABLES:</p><div class="language-sql codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-sql codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">SHOW</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">TABLES</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">FROM</span><span class="token plain"> mysql</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token plain">test</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>Finally, you can access the table in the MySQL database:</p><div class="language-sql codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-sql codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">SELECT</span><span class="token plain"> </span><span class="token operator">*</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">FROM</span><span class="token plain"> mysql</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token plain">test</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">table</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h2 class="anchor anchorWithStickyNavbar_LWe7" id="statement-transparent-transmission">Statement transparent transmission<a href="#statement-transparent-transmission" class="hash-link" aria-label="Direct link to Statement transparent transmission" title="Direct link to Statement transparent transmission"></a></h2><p>Doris supports direct execution of DDL, DML statements and query statements of JDBC data sources through transparent transmission.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="transparent-transmission-of-ddl-and-dml">Transparent transmission of DDL and DML<a href="#transparent-transmission-of-ddl-and-dml" class="hash-link" aria-label="Direct link to Transparent transmission of DDL and DML" title="Direct link to Transparent transmission of DDL and DML"></a></h3><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token plain">CALL EXECUTE_STMT(&quot;catalog_name&quot;, &quot;raw_stmt_string&quot;);</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>The <code>EXECUTE_STMT()</code> procedure takes two parameters:</p><ul><li>Catalog Name: Currently only JDBC type Catalog is supported.</li><li>Execution statements: Currently only DDL and DML statements are supported, and the syntax corresponding to the data source needs to be used directly.</li></ul><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token plain">CALL EXECUTE_STMT(&quot;jdbc_catalog&quot;, &quot;insert into db1.tbl1 values(1,2), (3, 4)&quot;);</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">CALL EXECUTE_STMT(&quot;jdbc_catalog&quot;, &quot;delete from db1.tbl1 where k1 = 2&quot;);</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">CALL EXECUTE_STMT(&quot;jdbc_catalog&quot;, &quot;create table dbl1.tbl2 (k1 int)&quot;);</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="transparent-query">Transparent query<a href="#transparent-query" class="hash-link" aria-label="Direct link to Transparent query" title="Direct link to Transparent query"></a></h3><div class="language-sql codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-sql codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token plain">query</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">  </span><span class="token string" style="color:rgb(255, 121, 198)">&quot;catalog&quot;</span><span class="token plain"> </span><span class="token operator">=</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">&quot;catalog_name&quot;</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">  </span><span class="token string" style="color:rgb(255, 121, 198)">&quot;query&quot;</span><span class="token plain"> </span><span class="token operator">=</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">&quot;select * from db_name.table_name where condition&quot;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">  </span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>The <code>query</code> table function takes two parameters:</p><ul><li><code>catalog</code>: Catalog name, which needs to be filled in according to the name of the Catalog.</li><li><code>query</code>: The query statement that needs to be executed, and the syntax corresponding to the data source needs to be used directly.</li></ul><div class="language-sql codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-sql codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">select</span><span class="token plain"> </span><span class="token operator">*</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">from</span><span class="token plain"> query</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token string" style="color:rgb(255, 121, 198)">&quot;catalog&quot;</span><span class="token plain"> </span><span class="token operator">=</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">&quot;jdbc_catalog&quot;</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">&quot;query&quot;</span><span class="token plain"> </span><span class="token operator">=</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">&quot;select * from db_name.table_name where condition&quot;</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="principles-and-limitations">Principles and Limitations<a href="#principles-and-limitations" class="hash-link" aria-label="Direct link to Principles and Limitations" title="Direct link to Principles and Limitations"></a></h3><p>Through the <code>CALL EXECUTE_STMT()</code> command, Doris will directly send the SQL statement written by the user to the JDBC data source corresponding to the Catalog for execution. Therefore, this operation has the following limitations:</p><ul><li>The SQL statement must be the syntax corresponding to the data source. Doris will not perform syntax and semantic checks.</li><li>It is recommended that the table name referenced in the SQL statement be a fully qualified name, that is, in the format of <code>db.tbl</code>. If db is not specified, the db name specified in the JDBC URL of the JDBC Catalog is used.</li><li>SQL statements cannot reference library tables other than JDBC data sources, nor can they reference Doris library tables. However, you can reference library tables in the JDBC data source but not synchronized to the Doris JDBC Catalog.</li><li>When executing a DML statement, the number of rows inserted, updated, or deleted cannot be obtained, but only whether the command was successfully executed.</li><li>Only users with LOAD permissions on the Catalog can execute the <code>CALL EXECUTE_STMT()</code> command.</li><li>Only users with SELECT permissions on Catalog can execute the <code>query()</code> table function.</li><li>The supported data types of the data read by the <code>query</code> table function are consistent with the data types supported by the queried catalog type.</li></ul></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/docs/2.0/lakehouse/datalake/cloud-auth"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Cloud Service Authentication</div></a><a 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144.896 154.112 144.896 260.096 0 51.2-12.8 100.352-36.352 144.384-2.048 4.096-6.144 10.752-11.776 20.48l17.408 64c7.68 28.672-18.432 54.784-47.104 47.104l-64-17.408-7.68 4.608c-47.616 28.672-101.888 43.52-157.184 43.52-71.68-0.512-140.8-25.088-195.584-71.168z m95.232-28.672c31.232 15.36 65.536 23.04 100.352 23.04 41.472 0 82.432-11.264 117.76-32.768 2.56-1.536 9.728-5.632 22.016-12.8 8.704-5.12 19.456-6.656 29.184-3.584l14.848 4.096-4.096-14.848c-2.56-10.24-1.536-20.48 4.096-29.696 6.144-10.24 12.288-20.992 18.432-31.232 17.92-33.28 27.136-70.656 27.136-108.544 0-59.904-23.552-117.76-65.536-160.256-13.312 164.352-118.272 303.616-264.192 366.592z m-462.848-155.648l-14.848 54.784 54.784-14.848c9.728-2.56 20.48-1.536 29.184 4.096 18.432 10.752 29.184 16.896 32.768 19.456 56.32 33.792 120.832 51.712 186.88 51.712 200.704 0 363.52-162.816 363.52-363.52s-162.816-363.52-363.52-363.52-363.52 162.816-363.52 363.52c0 60.928 14.848 119.296 43.008 171.52 3.584 7.168 13.312 23.04 27.648 47.616 5.632 8.704 6.656 19.456 4.096 29.184z m448.512-382.976c20.992 0 38.4 16.896 38.4 38.4 0 20.992-16.896 38.4-38.4 38.4H284.16c-20.992 0-38.4-16.896-38.4-38.4 0-20.992 16.896-38.4 38.4-38.4h318.976z m-153.088 191.488c20.992 0 38.4 16.896 38.4 38.4 0 20.992-16.896 38.4-38.4 38.4H284.16c-20.992 0-38.4-16.896-38.4-38.4 0-20.992 16.896-38.4 38.4-38.4h165.888z m0 0" p-id="8501" fill="currentColor"></path></svg></a><span class="ml-4">On This Page</span><ul class="table-of-contents table-of-contents__left-border"><li><a href="#supported-databases" class="table-of-contents__link toc-highlight">Supported databases</a></li><li><a href="#configuration" class="table-of-contents__link toc-highlight">Configuration</a><ul><li><a href="#basic-properties" class="table-of-contents__link toc-highlight">Basic properties</a></li><li><a href="#optional-properties" class="table-of-contents__link toc-highlight">Optional properties</a></li><li><a href="#connection-pool-properties" class="table-of-contents__link toc-highlight">Connection pool properties</a></li></ul></li><li><a href="#property-notes" class="table-of-contents__link toc-highlight">Property Notes</a><ul><li><a href="#driver-package-path-and-security" class="table-of-contents__link toc-highlight">Driver package path and security</a></li><li><a href="#lowercase-name-synchronization" class="table-of-contents__link toc-highlight">Lowercase name synchronization</a></li><li><a href="#specify-synchronization-database" class="table-of-contents__link toc-highlight">Specify synchronization database</a></li><li><a href="#connection-pool-configuration" class="table-of-contents__link toc-highlight">Connection pool configuration</a></li><li><a href="#insert-transaction" class="table-of-contents__link toc-highlight">Insert transaction</a></li></ul></li><li><a href="#example" class="table-of-contents__link toc-highlight">Example</a></li><li><a href="#statement-transparent-transmission" class="table-of-contents__link toc-highlight">Statement transparent transmission</a><ul><li><a href="#transparent-transmission-of-ddl-and-dml" class="table-of-contents__link toc-highlight">Transparent transmission of DDL and DML</a></li><li><a href="#transparent-query" class="table-of-contents__link toc-highlight">Transparent query</a></li><li><a href="#principles-and-limitations" class="table-of-contents__link toc-highlight">Principles and Limitations</a></li></ul></li></ul></div></div></div></div></main></div></div></div><div class="footer pt-16 pb-10"><div class="container"><div class="footer-box"><div class="left"><img src="/images/asf_logo_apache.svg" alt="" class="themedImage_ToTc themedImage--light_HNdA footer__logo"><img src="/images/asf_logo_apache.svg" alt="" class="themedImage_ToTc themedImage--dark_i4oU footer__logo"><div class="row footer__links"><div class="col footer__col"><div class="footer__title">ASF</div><ul class="footer__items clean-list"><li class="footer__item"><a href="https://www.apache.org/" target="_blank" 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