java - 无法在 SQL Server 中通过 JDBC 调用 CREATE SCHEMA

Question

我使用的是官方 SQL Server JDBC 驱动程序:

<dependency>
    <groupId>com.microsoft.sqlserver</groupId>
    <artifactId>mssql-jdbc</artifactId>
    <version>6.2.0.jre8</version>
</dependency>

在这里运行这段代码:

try (Connection c = new com.microsoft.sqlserver.jdbc.SQLServerDriver().connect(u, p)) {
    try (PreparedStatement s1 = c.prepareStatement("create schema x");
         PreparedStatement s2 = c.prepareStatement("drop schema x")) {
        System.out.println(s1.execute());
        System.out.println(s2.execute());
    }
}

但是我收到了这个错误:

com.microsoft.sqlserver.jdbc.SQLServerException: Incorrect syntax near the keyword 'schema'.
    at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDatabaseError(SQLServerException.java:258)
    at com.microsoft.sqlserver.jdbc.SQLServerStatement.getNextResult(SQLServerStatement.java:1547)
    at com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement.doExecutePreparedStatement(SQLServerPreparedStatement.java:528)
    at com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement$PrepStmtExecCmd.doExecute(SQLServerPreparedStatement.java:461)
    at com.microsoft.sqlserver.jdbc.TDSCommand.execute(IOBuffer.java:7151)
    at com.microsoft.sqlserver.jdbc.SQLServerConnection.executeCommand(SQLServerConnection.java:2689)
    at com.microsoft.sqlserver.jdbc.SQLServerStatement.executeCommand(SQLServerStatement.java:224)
    at com.microsoft.sqlserver.jdbc.SQLServerStatement.executeStatement(SQLServerStatement.java:204)
    at com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement.execute(SQLServerPreparedStatement.java:445)

显然，这些语句是正确的，它们作为静态语句工作:

try (Statement s1 = c.createStatement();
     Statement s2 = c.createStatement()) {
    System.out.println(s1.execute("create schema x"));
    System.out.println(s2.execute("drop schema x"));
}

这是故意的，还是 JDBC 驱动程序中的错误？

Answer 1

这似乎是 6.2.0 版本的回归。它曾经在版本 6.1.0 中工作。我已将此问题报告给 Microsoft:https://github.com/Microsoft/mssql-jdbc/issues/370

CREATE VIEW 语句也受到影响:

// Works on both versions 6.2.0 and 6.1.0
try (Statement s1 = c.createStatement();
     Statement s2 = c.createStatement()) {
    System.out.println(s1.execute("create view x as select 1 a"));
    System.out.println(s2.execute("drop view x"));
}

// Works only on version 6.1.0
try (PreparedStatement s1 = c.prepareStatement("create view x as select 1 a");
     PreparedStatement s2 = c.prepareStatement("drop view x")) {
    System.out.println(s1.execute());
    System.out.println(s2.execute());
}

(我在 Stack Overflow 上记录了这一点，因为一些运行 DDL 的工具，包括 jOOQ、Hibernate、MyBatis、Flyway 等可能会受到影响)