【发布时间】:2016-03-02 20:27:46
【问题描述】:
我知道有很多关于这个主题的问题,但不幸的是,到目前为止没有任何帮助。我想在我的数据库中有一个多列主键。数据库在服务器上,应该为许多用户保存证书。证书的主键是序列号 + 颁发者(这使证书唯一),除此之外 - 因为多个用户可以拥有此证书 - 我想添加(唯一的)用户名。 因此,我的主键应该是(序列号、发行者、用户名)。但它不起作用。一旦我尝试再次为其他用户添加证书,他就会覆盖旧条目。
我的数据库设置如下
stmt.execute(
"CREATE TABLE IF NOT EXISTS certificates (" +
"serial VARCHAR NOT NULL," + // serial
"issuer VARCHAR NOT NULL," + // issuer
"subject VARCHAR NOT NULL," + // subject
"publickey VARCHAR NOT NULL," + // public key
"notbefore DATETIME NOT NULL," + // not before
"notafter DATETIME NOT NULL," + // not after
"certdata BLOB," + // DER-encoded certificate
"revoked BOOLEAN NOT NULL," + // is certificate revoked
"trusted BOOLEAN NOT NULL," + // is certificate trusted
"untrusted BOOLEAN NOT NULL," + // is certificate untrusted
"S BOOLEAN NOT NULL," + // is certificate in the S set
"" + // of the related assessment
"username TEXT NOT NULL," + // the user to which this certificate belongs
"" +
"CHECK (S IN (0, 1))," +
"CHECK (trusted IN (0, 1))," +
"CHECK (untrusted IN (0, 1))," +
"CHECK (NOT (trusted = 1 AND untrusted = 1))," +
"" +
"FOREIGN KEY (username)" +
" REFERENCES users(username)" +
" ON DELETE CASCADE," +
"PRIMARY KEY (serial, issuer, username))");
语句stmt来自
poolManager = new MiniConnectionPoolManager(dataSource, MAX_CONNECTIONS);
try (Connection connection = poolManager.getConnection();
Statement stmt = connection.createStatement()) {
我已经尝试过 UNIQUE(serial, issuer, username) 和 CONSTRAINTS uniqueEntry PRIMARY KEY (serial, issuer, username) 而不是 PRIMARY KEY (serial, issuer, username)。两者都给出相同的结果。
我正在使用 IntelliJ 15.0.3,方言是 SQLite,驱动程序是 sqlite-jdbc-2.8.11.2.jar。
是的,还有一些表格,但它们的结构相同。如果我找到了这个表的解决方案,所有其他人都应该相应地工作。
【问题讨论】:
-
如果用户名是唯一的,为什么不将其用作主键??
-
你到底想插入什么?
-
@Zion:因为一个用户可能拥有多个证书。
-
@CL。非常感谢您。这就是问题所在。在我的前辈编写插入语句的方式中,主键必须单独给出。
标签: java sqlite intellij-idea composite-primary-key