9.6.2. 对 Microsoft SQL Server 数据库的 Unicode 支持
Unicode 字符只支持 Microsoft SQL Server 数据库的特殊字段。数据库不需要特殊设置。
JDBC 驱动程序的 sendStringParametersAsUnicode 属性应设为 false，以显著提高性能。如果没有此参数，Microsoft SQL Server 可能无法使用索引。
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