如何使用c#在firebird中执行事务(或多个sql查询)

Question

我尝试了几种方法,包括SO.

以下MYSQL代码在Firebird中不起作用:

CREATE TABLE publications (
  INT NOT NULL AUTO_INCREMENT , 
  PRIMARY KEY (`id`),
  filename varchar(500) not null unique,
  title varchar(500) DEFAULT NULL,
  authors varchar(1000) DEFAULT NULL,
  uploader int DEFAULT NULL,
  keywords varchar(500) DEFAULT NULL,
  rawtext text,
  lastmodified timestamp default CURRENT_TIMESTAMP
);

所以为了在Firebird中实现这一点,我正在使用:

 CREATE TABLE publications (
   id int NOT NULL PRIMARY KEY,
   filename varchar(500) NOT NULL UNIQUE,
   title varchar(500) DEFAULT NULL,
   authors varchar(1000) DEFAULT NULL,
   uploader int DEFAULT NULL,
   keywords varchar(500) DEFAULT NULL,
   rawtext text,
   file_data BLOB SUB_TYPE 0,
   insertdate timestamp DEFAULT NULL
 );

 CREATE GENERATOR gen_t1_id;
 SET GENERATOR gen_t1_id TO 0;

set term !! ;

 CREATE TRIGGER journalInsertionTrigger FOR publications 
 ACTIVE BEFORE INSERT POSITION 0
 AS
 BEGIN
  if (NEW.ID is NULL) then NEW.ID = GEN_ID(GEN_T1_ID, 1);
 END!!

set term ; !!

有了上述,我得到错误:

Batch execution aborted The returned message was: Dynamic SQL Error SQL error code = -104 Token unknown - line 13, char 2 CREATE"

当我取消//FbTransaction fbt = Connection.BeginTransaction();和//fbt.Commit();

当分配给命令的Connection对象处于挂起的本地事务中时,Execute要求Command对象具有Transaction对象.Command的Transaction属性尚未初始化.

我使用以下C#代码:

//FbTransaction fbt = Connection.BeginTransaction(); // 
FbBatchExecution fbe = new FbBatchExecution( Connection );

fbe.SqlStatements = new System.Collections.Specialized.StringCollection();//.Add( queryString ); // Your string here                    
fbe.SqlStatements.Add( queryString ); // Your string here

fbe.Execute();
//fbt.Commit();

注意:set term ; !!在sql代码的开头设置会给出错误:The type of the SQL statement could not be determinated

我该怎么做呢？

Answer 1

Firebird只能执行单独的SQL语句,而Firebird的大多数驱动程序都遵循相同的规则.你不能像这样一次执行脚本.

Firebird.net提供程序包含一个实用程序类,用于将脚本拆分为单个语句.

你需要做一些事情:

using (var connection = new FbConnection(@"User=sysdba;Password=masterkey;Database=D:\data\db\testdatabase.fdb;DataSource=localhost"))
{
    connection.Open();
    FbScript script = new FbScript(dbScript);
    script.Parse();
    FbBatchExecution fbe = new FbBatchExecution(connection);
    fbe.AppendSqlStatements(script);
    fbe.Execute();
}

请注意,要使当前脚本正常工作,您还需要替换:

rawtext text,

同

rawtext BLOB SUB_TYPE TEXT CHARACTER SET UTF8

从技术上讲,您可以不使用字符集子句,但除非您为数据库定义了默认字符集,否则应指定字符集,否则NONE可能会导致以后出现问题.

您在使用时无法自行启动事务FbBatchExecution,因为事务是在Execute方法内部处理的.请注意,如果您还想在脚本中插入(或以其他方式修改)数据,那么您应该使用Execute(true),以便立即提交每个DDL语句.Firebird不允许DML在同一事务中使用事务中的DDL更改.

问题SET TERM是由SET TERM不属于Firebird语法的事实引起的.它是ISQL和FlameRobin等工具使用的语法的一部分,例如FbScript.

如果您想单独执行这些语句并控制事务,您可以执行以下操作:

using (var connection = new FbConnection(@"User=sysdba;Password=masterkey;Database=D:\data\db\testdatabase.fdb;DataSource=localhost"))
{
    connection.Open();
    using (var transaction = connection.BeginTransaction())
    using (var command = new FbCommand())
    {
        command.Connection = connection;
        command.Transaction = transaction;

        command.CommandText = @"CREATE TABLE publications (
           id int NOT NULL PRIMARY KEY,
           filename varchar(500) NOT NULL UNIQUE,
           title varchar(500) DEFAULT NULL,
           authors varchar(1000) DEFAULT NULL,
           uploader int DEFAULT NULL,
           keywords varchar(500) DEFAULT NULL,
           rawtext BLOB SUB_TYPE TEXT CHARACTER SET UTF8,
           file_data BLOB SUB_TYPE 0,
           insertdate timestamp DEFAULT NULL
         )";
        command.ExecuteNonQuery();

        command.CommandText = "CREATE GENERATOR gen_t1_id";
        command.ExecuteNonQuery();

        command.CommandText = @"CREATE TRIGGER journalInsertionTrigger FOR publications 
         ACTIVE BEFORE INSERT POSITION 0
         AS
         BEGIN
          if (NEW.ID is NULL) then NEW.ID = GEN_ID(GEN_T1_ID, 1);
         END";
        command.ExecuteNonQuery();

        transaction.Commit();
    }
}