Postgres95 1.01 Distribution - Virgin SourcesPG95-1_01

1 files changed, 131 insertions, 0 deletions

diff --git a/src/interfaces/libpq++/examples/testlibpq3.cc b/src/interfaces/libpq++/examples/testlibpq3.cc
new file mode 100644
index 00000000000..1146dffac98
--- /dev/null
+++ b/src/interfaces/libpq++/examples/testlibpq3.cc
@@ -0,0 +1,131 @@
+/*
+ * testlibpq3.cc
+ * 	Test the C++ version of LIBPQ, the POSTGRES frontend library.
+ *   tests the binary cursor interface
+ *
+ *
+ *
+ populate a database by doing the following:
+ 
+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 <stdio.h>
+#include "libpq++.H"
+extern "C" {
+#include "utils/geo-decls.h" /* for the POLYGON type */
+}
+
+main()
+{
+  char* dbName;
+  int nFields;
+  int i,j;
+  int i_fnum, d_fnum, p_fnum;
+
+  /* begin, by creating the parameter environtment for a backend
+     connection. When no parameters are given then the system will
+     try to use reasonable defaults by looking up environment variables 
+     or, failing that, using hardwired constants */
+  PGenv env;
+  PGdatabase* data;
+
+  dbName = getenv("USER"); /* change this to the name of your test database */
+
+  /* make a connection to the database */
+  data = new PGdatabase(&env, dbName);
+
+  /* check to see that the backend connection was successfully made */
+  if (data->status() == CONNECTION_BAD) {
+    fprintf(stderr,"Connection to database '%s' failed.\n", dbName);
+    fprintf(stderr,"%s",data->errormessage());
+    delete data;
+    exit(1);
+  }
+
+  /* start a transaction block */
+  if (data->exec("BEGIN") != PGRES_COMMAND_OK) {
+    fprintf(stderr,"BEGIN command failed\n");
+    delete data;
+    exit(1);
+  }
+
+  /* fetch instances from the pg_database, the system catalog of databases*/
+  if (data->exec("DECLARE mycursor BINARY CURSOR FOR select * from test1")
+      != PGRES_COMMAND_OK) {
+    fprintf(stderr,"DECLARE CURSOR command failed\n");
+    delete data;
+    exit(1);
+  }
+
+  if (data->exec("FETCH ALL in mycursor") != PGRES_TUPLES_OK) {
+    fprintf(stderr,"FETCH ALL command didn't return tuples properly\n");
+    delete data;
+    exit(1);
+  }
+ 
+  i_fnum = data->fieldnum("i");
+  d_fnum = data->fieldnum("d");
+  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));
+  }
+*/
+
+  for (i=0; i < data->ntuples(); i++) {
+    int *ival; 
+    float *dval;
+    int plen;
+    POLYGON* pval;
+    /* we hard-wire this to the 3 fields we know about */
+    ival = (int*)data->getvalue(i,i_fnum);
+    dval = (float*)data->getvalue(i,d_fnum);
+    plen = data->getlength(i,p_fnum);
+
+    /* plen doesn't include the length field so need to increment by VARHDSZ*/
+    pval = (POLYGON*) malloc(plen + VARHDRSZ); 
+    pval->size = plen;
+    memmove((char*)&pval->npts, data->getvalue(i,p_fnum), plen);
+    printf("tuple %d: got\n", i);
+    printf(" i = (%d bytes) %d,\n",
+	   data->getlength(i,i_fnum), *ival);
+    printf(" d = (%d bytes) %f,\n",
+	   data->getlength(i,d_fnum), *dval);
+    printf(" p = (%d bytes) %d points \tboundbox = (hi=%f/%f, lo = %f,%f)\n",
+	   data->getlength(i,d_fnum),
+	   pval->npts,
+	   pval->boundbox.xh,
+	   pval->boundbox.yh,
+	   pval->boundbox.xl,
+	   pval->boundbox.yl);
+  }
+  
+  /* close the portal */
+  data->exec("CLOSE mycursor");
+
+  /* end the transaction */
+  data->exec("END");
+
+  /* close the connection to the database and cleanup */
+  delete data;
+}