Detailed Dynamic Sql Program - HP NonStop SQL/MP Programming Manual

Dynamic SQL Operations
Example 10-8. Detailed Dynamic SQL Program (page 2 of 22)
58 /* ----------------------------------------------------------- */
59 /* SQLDAs and names buffers for input and output variables
60 /* ----------------------------------------------------------- */
61 sqldaptr sda_i;
62 sqldaptr sda_o;
63
64 /* To give SQL reasonable size information for the names
65 /* buffers, pointers to arrays of 1000 chars are
66 /* currently used. The program will still allocate
67 /* memory just for the required size for the names buffer;
68 /* but such a reference in the embedded SQL statements
69 /* lets SQL get more reasonable sized data (other than
70 /* 1 if a char pointer is used). If enough memory,
71 /* as reported in the SQLSA after the PREPARE statement,
72 /* is allocated for the names buffer, SQL will not use
73 /* (hence, will overwrite) any undesired memory locations.
74
75 typedef char (*arrayptr) [1000];
76 arrayptr cname_i;
77 arrayptr cname_o;
78
79 /* ----------------------------------------------------------- */
80 /* Buffers for storing SQL statements are always blank padded, */
81 /* never null terminated
82 /* ----------------------------------------------------------- */
83 #define max_query_size 512
84 char host1[max_query_size + 1]; /* accepts SQL string
85 char host2[max_query_size + 1]; /* copy of the last SQL stmt
86
87 exec sql end declare section;
88
89 /* ----------------------------------------------------------- */
90 /* The following UNION is defined for pointers to buffers of
91 /* different (SQL) data types. This program does not handle
92 /* FLOAT, DOUBLE PRECISION, or DATETIME
93 /* ----------------------------------------------------------- */
94 union in_out_ptrs_u {
95
96
97
98
99
100 /*
101 } in_out_ptrs;
102
103 static short last_query_size = 0; /* num bytes in last query
104 char datatype_name[50];
105
106 /* ----------------------------------------------------------------- */
107 /* Terminator character when requesting user query (semicolon)
108 /* ----------------------------------------------------------------- */
109 #define QUERY_TERMINATOR (char) ';'
110 /* Cast as char because C treats character constants as type int, */
111 /* and we want to reference it as type char in the function
112 /* prototype
113
114 /* ----------------------------------------------------------------- */
115 /* Terminator character when requesting input param values (EOL)
116 /* ----------------------------------------------------------------- */
117 #define PARAM_TERMINATOR (char) '\n'
118
HP NonStop SQL/MP Programming Manual for C—429847-008
char *char_ptr;
short *smallint_ptr;
unsigned short *usmallint_ptr;
long *integer_ptr;
unsigned long *uinteger_ptr;
long long *longint_ptr;
/* ptr to input sqlda
/* ptr to output sqlda
/* ptr to input names buffer
/* ptr to output names buffer
/* for CHAR/VARCHAR
/* SMALLINT
/* UNSIGNED SMALLINT
/* INTEGER
/* UNSIGNED INTEGER
64-BIT INTEGER
/* to display datatype name* /
10-45

Detailed Dynamic SQL Program

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