内部连接两个 table 变量和 return 来自 c# 应用程序中匿名 plsql 块的输出游标

Question

我有这种情况：

我需要将许多联接的结果（15 tables 使用各种过滤器）插入到 table 变量中 var_TB_PROJECT
然后将许多其他联接的结果（8 table 具有各种过滤器）插入另一个 table 变量 var_TB_CAMERAS
最后，内联这两个table变量

所有这些都在匿名 plsql 块中，因为我无法在源数据库中创建任何对象（无权限）。

这个匿名 plsql 块将在 C# 应用程序中执行，该应用程序将 return 输出游标作为下面的示例代码。

可以吗？

static void TestBlock()
{
        string conString = ConfigManager.GetConnectionStringByName("CI_L3"); 
        OracleConnection con = new OracleConnection();
        con.ConnectionString = conString;
        con.Open();

        string cmdtxt = @"
                    DECLARE
                      type rectyp is record(TABLE1.FIELD1%TYPE, TABLE2.FIELD1%TYPE, TABLE3.FIELD1%TYPE, ... many fields ....  );
                      type tpTbl is table of rectyp;
                      var_TB_PROJETO tpTbl;
                      var_TB_CAMERAS tpTbl;

                    BEGIN

                     -- load var_TB_PROJETO
                      select FIELD1, FIEL2, FIELN .... bulk collect into var_TB_PROJETO
                      from TABLE1 INNER JOIN TABLE2 ON TABLE1.ID = TABLE2.FID
                      INNER JOIN TABLE3 ON TABLE2.ID = TABLE3.FID .... 
                        .
                        .
                        -- many tables ...
                        .
                        .

                     -- load var_TB_CAMERAS
                      select FIELD1, FIEL2, FIELN .... bulk collect into var_TB_CAMERAS
                      from TABLE1 INNER JOIN TABLE2 ON TABLE1.ID = TABLE2.FID
                      INNER JOIN TABLE3 ON TABLE2.ID = TABLE3.FID .... 
                        .
                        .
                        -- many tables ...
                        .
                        .

                      OPEN :1 for SELECT * FROM var_TB_PROJETO INNER JOIN var_TB_CAMERAS 
                            ON var_TB_PROJETO.ID = var_TB_CAMERAS.ID;

                END;";

        OracleCommand cmd = con.CreateCommand();
        cmd.CommandText = cmdtxt;
        OracleParameter p1 = cmd.Parameters.Add("refcursor1", OracleDbType.RefCursor);  
        p1.Direction = ParameterDirection.Output;

        cmd.ExecuteNonQuery();

        OracleDataReader dr1 = ((OracleRefCursor)cmd.Parameters[0].Value).GetDataReader();

        while (dr1.Read()) {
            var st1 = dr1.GetString(0);
        }
}

Answer 1

@Goldar：为什么要使用匿名 PL/SQL 块，当它可以作为 SQL 语句

解决时

 WITH TB_PROJETO as (
  select TABLE1.ID, FIELD1, FIEL2, FIELN
  from TABLE1 INNER JOIN TABLE2 ON TABLE1.ID = TABLE2.FID
  INNER JOIN TABLE3 ON TABLE2.ID = TABLE3.FID .... 
    .
    .
    -- many tables ...
    .
    .
), TB_CAMERAS as (
  select TABLE1.ID, FIELD1, FIEL2, FIELN 
  from TABLE1 INNER JOIN TABLE2 ON TABLE1.ID = TABLE2.FID
  INNER JOIN TABLE3 ON TABLE2.ID = TABLE3.FID .... 
    .
    .
    -- many tables ...
    .
    .
)
SELECT *
FROM TB_PROJETO
INNER JOIN TB_CAMERAS ON TB_PROJETO.ID = TB_CAMERAS.ID;

内部连接两个 table 变量和 return 来自 c# 应用程序中匿名 plsql 块的输出游标

Inner join two table variables and return an output cursor from an anonymous plsql block in a c# application

c#

oracle

plsql

inner-join

table-variable