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java - sqlite 无法连接到数据库错误：java.lang.UnsatisfiedLinkError: org.sqlite.core.NativeDB._open_utf8([BI)V

问题描述

我收到以下错误：我有这段代码在发布之前我已经尝试了几件事，我确定这是它没有连接到数据库的源错误。我在 tomcat 中运行此代码作为微服务的后端数据库。由于某种原因它无权访问，它正在尝试连接到我的临时目录。我有用

System.setProperty("java.io.tmpdir", "C:\\Dev\\temp");

它确实将 dll 文件写入此位置。但它没有连接到数据库。如果数据库不存在，则必须先创建数据库

Caused by: **java.lang.UnsatisfiedLinkError: org.sqlite.core.NativeDB._open_utf8([BI)V**
at org.sqlite.core.NativeDB._open_utf8(Native Method)
at org.sqlite.core.NativeDB._open(NativeDB.java:78)
at org.sqlite.core.DB.open(DB.java:202)
at org.sqlite.SQLiteConnection.open(SQLiteConnection.java:243)
at org.sqlite.SQLiteConnection.<init>(SQLiteConnection.java:61)
at org.sqlite.jdbc3.JDBC3Connection.<init>(JDBC3Connection.java:28)
at org.sqlite.jdbc4.JDBC4Connection.<init>(JDBC4Connection.java:21)
at org.sqlite.JDBC.createConnection(JDBC.java:115)
at org.sqlite.JDBC.connect(JDBC.java:90)
at java.sql.DriverManager.getConnection(DriverManager.java:664)
at java.sql.DriverManager.getConnection(DriverManager.java:270)java.lang.UnsatisfiedLinkError: org.sqlite.core.NativeDB._open(Ljava/lang/String;I)V

当我尝试连接到 sqlite 数据库时，出现上述错误

Failed to load native library:sqlite-3.31.1-0d2f436c-54b0-48ed-8a6b-044f659f50d6-sqlitejdbc.dll. osinfo: Windows/x86_64
java.lang.UnsatisfiedLinkError: C:\Users\home\AppData\Local\Temp\sqlite-3.31.1-0d2f436c-54b0-48ed-8a6b-044f659f50d6-sqlitejdbc.dll: Access is denied

我的基本代码是：

公共类数据库{

private static Database instance = new Database();
 Connection conn = null;
 Statement stmt = null;

private Database() { 
    getInstance();
}

public static Database getInstance() {
    return instance;
}

public Connection dbConnection() {

    String createTableQuery = "CREATE TABLE IF NOT EXIST fileBlock (pid not null, filename not null, PRIMARY KEY(pid,filename))";
    try {
        //create database if not exist and then connect
        Class.forName("org.sqlite.JDBC");
        conn = DriverManager.getConnection("jdbc:sqlite:blockedFiles.db");
        //verify table exist if not create it
        stmt = conn.createStatement();
        stmt.execute(createTableQuery);
        return conn;            
    }
    catch(Exception e){
        return null;
    }
}

public void closeConnection() {
    try {
        conn.close();
    }
    catch(Exception e) {}   
}

}

我的实现是

 Connection conn = Database.getInstance().dbConnection();
    if(conn != null ) {
        System.out.println("true");         
    }
    else {
        System.out.println("false");
    }       
    Database.getInstance().closeConnection();

标签： javasqlitedatabase-connection

解决方案

我发现这主要是本地机器上的权限问题。

我如何能够解决它是使用 SQLiteConfig 类。

这个类允许你传递配置选项。我添加到数据库连接类的设置：

 SQLiteConfig config = new SQLiteConfig();
  // config.setCacheSize(cache_size);
   config.setBusyTimeout(30000);
   config.setSynchronous(SynchronousMode.NORMAL);
   config.setTempStore(TempStore.MEMORY);
   config.setTempStoreDirectory("some path, I used same as java.io.tmpdir");
   config.setJournalMode(JournalMode.MEMORY);
 //create database if not exist and then connect
    Class.forName("org.sqlite.JDBC");
    conn = DriverManager.getConnection("jdbc:sqlite:blockedFiles.db", config.toProperties());
    //verify table exist if not create it
    stmt = conn.createStatement();
    stmt.execute(createTableQuery);
    return conn;

在连接到数据库之前，我告诉它在内存中加载驱动程序，并且日志文件 (WAL) 也在内存中。

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