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| <title>17. Microsoft SQL Server</title><base href="display"><link rel="stylesheet" type="text/css" href="css/docbook.css"><meta name="generator" content="DocBook XSL-NS Stylesheets V1.76.1"><link rel="home" href="manual.html" title="Apache OpenJPA 2.3 User's Guide"><link rel="up" href="supported_databases.html" title="Appendix 2. Supported Databases"><link rel="prev" href="dbsupport_access.html" title="16. Microsoft Access"><link rel="next" href="dbsupport_foxpro.html" title="18. Microsoft FoxPro"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">17. |
| Microsoft SQL Server |
| </th></tr><tr><td width="20%" align="left"><a accesskey="p" href="dbsupport_access.html">Prev</a> </td><th width="60%" align="center">Appendix 2. |
| Supported Databases |
| </th><td width="20%" align="right"> <a accesskey="n" href="dbsupport_foxpro.html">Next</a></td></tr></table><hr></div><div class="section" title="17. Microsoft SQL Server"><div class="titlepage"><div><div><h2 class="title" style="clear: both" id="dbsupport_sqlserver">17. |
| Microsoft SQL Server |
| </h2></div></div></div><div class="toc"><dl><dt><span class="section"><a href="dbsupport_sqlserver.html#dbsupport_sqlserver_issues">17.1. |
| Known issues with SQL Server |
| </a></span></dt></dl></div> |
| |
| <div class="example"><a name="example_props_sqlserver"></a><p class="title"><b>Example 2.13. |
| Example properties for Microsoft SQL Server |
| </b></p><div class="example-contents"> |
| |
| <pre class="programlisting"> |
| openjpa.ConnectionDriverName: com.microsoft.sqlserver.jdbc.SQLServerDriver |
| openjpa.ConnectionURL: \ |
| jdbc:sqlserver://SERVER_NAME:1433;DatabaseName=DB_NAME;selectMethod=cursor;sendStringParametersAsUnicode=false |
| </pre> |
| </div></div><br class="example-break"> |
| <div class="section" title="17.1. Known issues with SQL Server"><div class="titlepage"><div><div><h3 class="title" id="dbsupport_sqlserver_issues">17.1. |
| Known issues with SQL Server |
| </h3></div></div></div> |
| |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"> |
| <p> |
| When using a Microsoft SQL Server JDBC Driver v1.2 or earlier, the |
| ConnectionURL must always contain the <code class="literal">selectMethod=cursor |
| </code> string, which is necessary for the driver to properly |
| support large result sets. |
| </p> |
| </li><li class="listitem"> |
| <p> |
| When using a Microsoft SQL Server JDBC Driver v1.2 or earlier, the |
| JDBC driver has bugs that manifest themselves when prepared statements |
| are pooled. Please disable prepared statement pooling by including the |
| <code class="literal">MaxCachedStatements=0</code> configuration property |
| in your org.apache.openjpa.ConnectionFactoryProperties. |
| </p> |
| </li><li class="listitem"> |
| <p> |
| SQL Server date fields are accurate only to the nearest 3 milliseconds, |
| possibly resulting in precision loss in stored dates. |
| </p> |
| </li><li class="listitem"> |
| <p> |
| Adding <code class="literal">sendStringParametersAsUnicode=false</code> to the |
| ConnectionURL may significantly increase performance. |
| </p> |
| </li><li class="listitem"> |
| <p> |
| The Microsoft SQL Server driver only emulates batch updates. The DataDirect JDBC |
| driver has true support for batch updates, and may result in a significant |
| performance gain. |
| </p> |
| </li><li class="listitem"> |
| <p> |
| Floats and doubles may lose precision when stored. |
| </p> |
| </li><li class="listitem"> |
| <p> |
| <code class="literal">TEXT</code> columns cannot be used in queries. |
| </p> |
| </li><li class="listitem"> |
| <p> |
| When using a SQL Server instance that has been configured to be case-sensitive |
| in schema names, you need to set the "schemaCase=preserve" parameter in the |
| <a class="link" href="ref_guide_conf_jdbc.html#openjpa.jdbc.DBDictionary" title="6.2. openjpa.jdbc.DBDictionary">openjpa.jdbc.DBDictionary</a> |
| property. |
| </p> |
| </li><li class="listitem"> |
| <p> |
| SQL Server 2005 does not support native sequences. If you would like to use |
| generated values with SQL Server you should use GenerationType.IDENTITY, |
| GenerationType.TABLE, or GenerationType.AUTO. |
| </p> |
| </li><li class="listitem"> |
| <p> |
| The use of <a class="link" href="ref_guide_mapping_jpa.html#ref_guide_streamsupport" title="7.11. LOB Streaming">LOB streaming</a> is limited. |
| When reading LOB data from the database, the Microsoft SQL Server driver will |
| actually load all the data into memory at the same time. |
| </p> |
| </li><li class="listitem"> |
| <p> |
| The SQL Server 2008 DATETIME2 data type supports 7 digits sub-second precision. |
| When DataDirect JDBC driver is used with SQL Server 2008, setTimestamp method call with |
| a java.sql.Timestamp argument of more than 3 digits precision in a prepared statement |
| will result in truncation. This may cause loss of data precision or |
| optimistic lock exception if an entity uses Timestamp type as version field. |
| </p> |
| </li></ul></div> |
| </div> |
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| Microsoft Access |
| </td><td width="20%" align="center"><a accesskey="h" href="manual.html">Home</a></td><td width="40%" align="right" valign="top"> 18. |
| Microsoft FoxPro |
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