Bring in Leo's <lsh@lubrizol.com> massive changes to libpq++

2025-07-30 11:03:19 +03:00 · 1997-02-13 10:01:05 +00:00
parent d62267c707
commit eacd0fd938
25 changed files with 1335 additions and 606 deletions
--- a/src/interfaces/libpq++/examples/testlibpq5.cc
+++ b/src/interfaces/libpq++/examples/testlibpq5.cc
@ -0,0 +1,102 @@
+/*
+ * testlibpq5.cc
+ * 	Test the C++ version of LIBPQ, the POSTGRES frontend library.
+ *   tests the binary cursor interface
+ *
+ *
+ *
+ populate a database by doing the following (use testlibpq5.sql):
+ 
+CREATE TABLE test1 (i int4, d float4, p polygon);
+
+INSERT INTO test1 values (1, 3.567, '(3.0, 4.0, 1.0, 2.0)'::polygon);
+
+INSERT INTO test1 values (2, 89.05, '(4.0, 3.0, 2.0, 1.0)'::polygon);
+
+ the expected output is:
+
+tuple 0: got
+ i = (4 bytes) 1,
+ d = (4 bytes) 3.567000,
+ p = (4 bytes) 2 points         boundbox = (hi=3.000000/4.000000, lo = 1.000000,2.000000)
+tuple 1: got
+ i = (4 bytes) 2,
+ d = (4 bytes) 89.050003,
+ p = (4 bytes) 2 points         boundbox = (hi=4.000000/3.000000, lo = 2.000000,1.000000)
+
+ *
+ */
+#include <iostream.h>
+#include <libpq++.h>
+#include <stdlib.h>
+extern "C" {
+#include "postgres.h"		// for Postgres types
+#include "utils/geo-decls.h" // for the POLYGON type
+}
+
+main()
+{
+  // Begin, by connecting to the backend using hardwired constants
+  // and a test database created by the user prior to the invokation
+  // of this test program.  Connect using cursor interface.
+  char* dbName = getenv("USER"); // change this to the name of your test database
+  PgCursor data(dbName, "mycursor");
+
+  // check to see that the backend connection was successfully made
+  if ( data.ConnectionBad() ) {
+    cerr << "Connection to database '" << dbName << "' failed." << endl
+         << data.ErrorMessage();
+    exit(1);
+  }
+
+  // Declare a binary cursor for all the tuples in database 'test1'
+  if ( !data.Declare("select * from test1", 1) ) {
+    cerr << "DECLARE CURSOR command failed" << endl;
+    exit(1);
+  }
+
+  // fetch all instances from the current cursor
+  if ( !data.Fetch() ) {
+    cerr << "FETCH ALL command didn't return tuples properly" << endl;
+    exit(1);
+  }
+ 
+  // Find the field numbers for the columns 'i', 'd', and 'p'
+  int i_fnum = data.FieldNum("i");
+  int d_fnum = data.FieldNum("d");
+  int p_fnum = data.FieldNum("p");
+  
+/*
+  for (i=0;i<3;i++) {
+      printf("type[%d] = %d, size[%d] = %d\n",
+	     i, data.FieldType(i), 
+	     i, data.FieldSize(i));
+  }
+*/
+
+  // Print out the information about the extracted tuple
+  for (int i=0; i < data.Tuples(); i++) {
+    // we hard-wire this to the 3 fields we know about
+    int* ival = (int*)data.GetValue(i,i_fnum);
+    float* dval = (float*)data.GetValue(i,d_fnum);
+    int plen = data.GetLength(i,p_fnum);
+
+    // Allocate correct memory space for the Polygon struct and copy
+    // the extracted data into it.
+    // plen doesn't include the length field so need to increment by VARHDSZ
+    POLYGON* pval = (POLYGON*) malloc(plen + VARHDRSZ); 
+    pval->size = plen;
+    memmove((char*)&pval->npts, data.GetValue(i,p_fnum), plen);
+    
+    // Display Polygon Information
+    cout << "tuple " << i << ": got" << endl
+         << " i = (" << data.GetLength(i,i_fnum) << " bytes) " << *ival << "," << endl
+         << " d = (" << data.GetLength(i,d_fnum) << " bytes) " << *dval << "," << endl
+         << " p = (" << data.GetLength(i,d_fnum) << " bytes) " << pval->npts << " points"
+         << "\tboundbox = (hi=" << pval->boundbox.xh << "/" << pval->boundbox.yh << ","
+         << "lo = " << pval->boundbox.xl << "," << pval->boundbox.yl << ")" << endl;
+	   
+    // Deallocate memory allocated for the Polygon structure
+    free(pval);
+  }
+}