MySQL数据库学习笔记（三）
2004-11-02 14:12
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附录一 Mytest.c
/****************************************************************/<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />
/* Author: Allen Lee TS : 2/ 4/2004 9:15 */
/* Date: 2/ 4/2004 */
/* mytest.c : test DDL statment*/
/* */
/* History: */
/* */
/****************************************************************/
#include <windows.h>
#include <stdio.h>
#include <string.h>
#include <mysql.h>
#define STRING_SIZE 50
#define DROP_SAMPLE_TABLE "DROP TABLE IF EXISTS test_table"
#define CREATE_SAMPLE_TABLE "CREATE TABLE test_table(col1 INT,/
col2 VARCHAR(40),/
col3 SMALLINT,/
col4 TIMESTAMP)"
#define INSERT_SAMPLE "INSERT INTO test_table(col1,col2,col3) VALUES(?,?,?)"
int main(int argc, char **argv){
MYSQL *mysql;
mysql = mysql_init(NULL);
if(!mysql_real_connect(mysql, "localhost","root","","",3306,"",NULL)){ /* Make connection with mysql_connect(MYSQL db, char *host, char *username, char *password */
printf(mysql_error(mysql));
exit(1);
}
if(mysql_select_db(mysql, "test")){ /* Select the database we want to use */
printf(mysql_error(mysql));
exit(1);
}
MYSQL_STMT *stmt;
MYSQL_BIND bind[3];
my_ulonglong affected_rows;
int param_count;
short small_data;
int int_data;
char str_data[STRING_SIZE];
unsigned long str_length;
my_bool is_null;
if (mysql_query(mysql, DROP_SAMPLE_TABLE))
{
fprintf(stderr, " DROP TABLE failed/n");
fprintf(stderr, " %s/n", mysql_error(mysql));
exit(0);
}
if (mysql_query(mysql, CREATE_SAMPLE_TABLE))
{
fprintf(stderr, " CREATE TABLE failed/n");
fprintf(stderr, " %s/n", mysql_error(mysql));
exit(0);
}
/* Prepare an INSERT query with 3 parameters */
/* (the TIMESTAMP column is not named; it will */
/* be set to the current date and time) */
stmt = mysql_prepare(mysql, INSERT_SAMPLE, strlen(INSERT_SAMPLE));
if (!stmt)
{
fprintf(stderr, " mysql_prepare(), INSERT failed/n");
fprintf(stderr, " %s/n", mysql_error(mysql));
exit(0);
}
fprintf(stdout, " prepare, INSERT successful/n");
/* Get the parameter count from the statement */
param_count= mysql_param_count(stmt);
fprintf(stdout, " total parameters in INSERT: %d/n", param_count);
if (param_count != 3) /* validate parameter count */
{
fprintf(stderr, " invalid parameter count returned by MySQL/n");
exit(0);
}
/* Bind the data for all 3 parameters */
/* INTEGER PARAM */
/* This is a number type, so there is no need to specify buffer_length */
bind[0].buffer_type= MYSQL_TYPE_LONG;
bind[0].buffer= (char *)&int_data;
bind[0].is_null= 0;
bind[0].length= 0;
/* STRING PARAM */
bind[1].buffer_type= MYSQL_TYPE_VAR_STRING;
bind[1].buffer= (char *)str_data;
bind[1].buffer_length= STRING_SIZE;
bind[1].is_null= 0;
bind[1].length= &str_length;
/* SMALLINT PARAM */
bind[2].buffer_type= MYSQL_TYPE_SHORT;
bind[2].buffer= (char *)&small_data;
bind[2].is_null= &is_null;
bind[2].length= 0;
/* Bind the buffers */
if (mysql_bind_param(stmt, bind))
{
fprintf(stderr, " mysql_bind_param() failed/n");
fprintf(stderr, " %s/n", mysql_stmt_error(stmt));
exit(0);
}
/* Specify the data values for the first row */
int_data= 10; /* integer */
strncpy(str_data, "MySQL", STRING_SIZE); /* string */
str_length= strlen(str_data);
/* INSERT SMALLINT data as NULL */
is_null= 1;
/* Execute the INSERT statement - 1*/
if (mysql_execute(stmt))
{
fprintf(stderr, " mysql_execute(), 1 failed/n");
fprintf(stderr, " %s/n", mysql_stmt_error(stmt));
exit(0);
}
/* Get the total number of affected rows */
affected_rows= mysql_stmt_affected_rows(stmt);
fprintf(stdout, " total affected rows(insert 1): %ld/n", affected_rows);
if (affected_rows != 1) /* validate affected rows */
{
fprintf(stderr, " invalid affected rows by MySQL/n");
exit(0);
}
/* Specify data values for second row, then re-execute the statement */
int_data= 1000;
strncpy(str_data, "The most popular open source database", STRING_SIZE);
str_length= strlen(str_data);
small_data= 1000; /* smallint */
is_null= 0; /* reset */
/* Execute the INSERT statement - 2*/
if (mysql_execute(stmt))
{
fprintf(stderr, " mysql_execute, 2 failed/n");
fprintf(stderr, " %s/n", mysql_stmt_error(stmt));
exit(0);
}
/* Get the total rows affected */
affected_rows= mysql_stmt_affected_rows(stmt);
fprintf(stdout, " total affected rows(insert 2): %ld/n", affected_rows);
if (affected_rows != 1) /* validate affected rows */
{
fprintf(stderr, " invalid affected rows by MySQL/n");
exit(0);
}
/* Close the statement */
if (mysql_stmt_close(stmt))
{
fprintf(stderr, " failed while closing the statement/n");
fprintf(stderr, " %s/n", mysql_stmt_error(stmt));
exit(0);
}
mysql_close(mysql);
return 0;
}
附录二 createdb.cpp
#include <windows.h>
#include <iostream>
#include <sqlplus.hh>
int main (int argc, char *argv[]) {
Connection connection(use_exceptions);
try { // the entire main block is one big try block;
if (argc == 1) connection.connect("mysql_cpp_data","localhost","root","");
else if (argc == 2) connection.connect("",argv[1]);
else if (argc == 3) connection.connect("",argv[1],argv[2]);
else if (argc <= 4) connection.connect("",argv[1],argv[2],argv[3]);
// create a new object and connect based on any (if any) arguments
// passed to main();
try {
connection.select_db("mysql_cpp_data");
} catch (BadQuery er) {
// if it couldn't connect to the database assume that it doesn't exist
// and try created it. If that does not work exit with an error.
connection.create_db("mysql_cpp_data");
connection.select_db("mysql_cpp_data");
}
Query query = connection.query(); // create a new query object
try { // ignore any errors here
// I hope to make this simpler soon
query.execute("drop table stock");
} catch (BadQuery er) {}
query << "create table stock (item char(20) not null, num bigint,"
<< "weight double, price double, sdate date)";
query.execute(RESET_QUERY);
// send the query to create the table and execute it. The
// RESET_QUERY tells the query object to reset it self after
// execution
query << "insert into %5:table values (%0q, %1q, %2, %3, %4q)";
query.parse();
// set up the template query I will use to insert the data. The
// parse method call is important as it is what lets the query
// know that this is a template and not a literal string
query.def["table"] = "stock";
// This is setting the parameter named table to stock.
query.execute ("Hamburger Buns", 56, 1.25, 1.1, "1998-04-26");
query.execute ("Hotdogs' Buns" ,65, 1.1 , 1.1, "1998-04-23");
query.execute ("Dinner Roles" , 75, .95, .97, "1998-05-25");
query.execute ("Allen Lee" , 87, 1.5, 1.75, "1998-09-04");
// The last parameter "table" is not specified here. Thus
// the default value for "table" is used which is "stock".
} catch (BadQuery er) { // handle any errors that may come up
cerr << "Error: " << er.error << endl;
return -1;
}
}
附录三 fieldinf.cpp
#include <windows.h>
#include <iostream>
#include <iomanip>
#include <sqlplus.hh>
int main() {
try { // its in one big try block
Connection con(use_exceptions);
con.connect("mysql_cpp_data","localhost","root","");
Query query = con.query();
query << "select * from stock";
Result res = query.store();
cout << "Query: " << query.preview() << endl;
cout << "Records Found: " << res.size() << endl << endl;
cout << "Query Info:/n";
cout.setf(ios::left);
for (unsigned int i = 0; i < res.names().size(); i++) {
cout << setw(2) << i
<< setw(15) << res.names(i).c_str()
// this is the name of the field
<< setw(15) << res.types(i).sql_name()
// this is the SQL identifier name
// Result::types(unsigned int) returns a mysql_type_info which in many
// ways is like type_info except that it has additional sql type
// information in it. (with one of the methods being sql_name())
<< setw(20) << res.types(i).name()
// this is the C++ identifier name which most closely resembles
// the sql name (its is implementation defined and often not very readable)
<< endl;
}
cout << endl;
if (res.types(0) == typeid(string))
cout << "Field 'item' is of an sql type which most closely resembles a/n"
<< "the c++ string type/n";
// this is demonstrating how a mysql_type_info can be compared with a c++
// type_info.
if (res.types(1) == typeid(longlong))
cout << "Field 'num' is of an sql type which most closely resembles a/n"
<< "the c++ long long int type/n";
else if (res.types(1).base_type() == typeid(longlong))
cout << "Field 'num' base type is of an sql type which most closely /n"
<< "resembles a the c++ long long int type/n";
// However you have to be careful as if it can be null the actual type is
// Null<TYPE> not TYPE. So you should always use the base_type method
// to get at the underlying type. If the type is not null than this base
// type would be the same as its type.
return 0;
} catch (BadQuery er) {
cerr << "Error: " << er.error << endl;
return -1;
} catch (BadConversion er) { // handle bad conversions
cerr << "Error: Tried to convert /"" << er.data << "/" to a /""
<< er.type_name << "/"." << endl;
return -1;
}
}
/****************************************************************/<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />
/* Author: Allen Lee TS : 2/ 4/2004 9:15 */
/* Date: 2/ 4/2004 */
/* mytest.c : test DDL statment*/
/* */
/* History: */
/* */
/****************************************************************/
#include <windows.h>
#include <stdio.h>
#include <string.h>
#include <mysql.h>
#define STRING_SIZE 50
#define DROP_SAMPLE_TABLE "DROP TABLE IF EXISTS test_table"
#define CREATE_SAMPLE_TABLE "CREATE TABLE test_table(col1 INT,/
col2 VARCHAR(40),/
col3 SMALLINT,/
col4 TIMESTAMP)"
#define INSERT_SAMPLE "INSERT INTO test_table(col1,col2,col3) VALUES(?,?,?)"
int main(int argc, char **argv){
MYSQL *mysql;
mysql = mysql_init(NULL);
if(!mysql_real_connect(mysql, "localhost","root","","",3306,"",NULL)){ /* Make connection with mysql_connect(MYSQL db, char *host, char *username, char *password */
printf(mysql_error(mysql));
exit(1);
}
if(mysql_select_db(mysql, "test")){ /* Select the database we want to use */
printf(mysql_error(mysql));
exit(1);
}
MYSQL_STMT *stmt;
MYSQL_BIND bind[3];
my_ulonglong affected_rows;
int param_count;
short small_data;
int int_data;
char str_data[STRING_SIZE];
unsigned long str_length;
my_bool is_null;
if (mysql_query(mysql, DROP_SAMPLE_TABLE))
{
fprintf(stderr, " DROP TABLE failed/n");
fprintf(stderr, " %s/n", mysql_error(mysql));
exit(0);
}
if (mysql_query(mysql, CREATE_SAMPLE_TABLE))
{
fprintf(stderr, " CREATE TABLE failed/n");
fprintf(stderr, " %s/n", mysql_error(mysql));
exit(0);
}
/* Prepare an INSERT query with 3 parameters */
/* (the TIMESTAMP column is not named; it will */
/* be set to the current date and time) */
stmt = mysql_prepare(mysql, INSERT_SAMPLE, strlen(INSERT_SAMPLE));
if (!stmt)
{
fprintf(stderr, " mysql_prepare(), INSERT failed/n");
fprintf(stderr, " %s/n", mysql_error(mysql));
exit(0);
}
fprintf(stdout, " prepare, INSERT successful/n");
/* Get the parameter count from the statement */
param_count= mysql_param_count(stmt);
fprintf(stdout, " total parameters in INSERT: %d/n", param_count);
if (param_count != 3) /* validate parameter count */
{
fprintf(stderr, " invalid parameter count returned by MySQL/n");
exit(0);
}
/* Bind the data for all 3 parameters */
/* INTEGER PARAM */
/* This is a number type, so there is no need to specify buffer_length */
bind[0].buffer_type= MYSQL_TYPE_LONG;
bind[0].buffer= (char *)&int_data;
bind[0].is_null= 0;
bind[0].length= 0;
/* STRING PARAM */
bind[1].buffer_type= MYSQL_TYPE_VAR_STRING;
bind[1].buffer= (char *)str_data;
bind[1].buffer_length= STRING_SIZE;
bind[1].is_null= 0;
bind[1].length= &str_length;
/* SMALLINT PARAM */
bind[2].buffer_type= MYSQL_TYPE_SHORT;
bind[2].buffer= (char *)&small_data;
bind[2].is_null= &is_null;
bind[2].length= 0;
/* Bind the buffers */
if (mysql_bind_param(stmt, bind))
{
fprintf(stderr, " mysql_bind_param() failed/n");
fprintf(stderr, " %s/n", mysql_stmt_error(stmt));
exit(0);
}
/* Specify the data values for the first row */
int_data= 10; /* integer */
strncpy(str_data, "MySQL", STRING_SIZE); /* string */
str_length= strlen(str_data);
/* INSERT SMALLINT data as NULL */
is_null= 1;
/* Execute the INSERT statement - 1*/
if (mysql_execute(stmt))
{
fprintf(stderr, " mysql_execute(), 1 failed/n");
fprintf(stderr, " %s/n", mysql_stmt_error(stmt));
exit(0);
}
/* Get the total number of affected rows */
affected_rows= mysql_stmt_affected_rows(stmt);
fprintf(stdout, " total affected rows(insert 1): %ld/n", affected_rows);
if (affected_rows != 1) /* validate affected rows */
{
fprintf(stderr, " invalid affected rows by MySQL/n");
exit(0);
}
/* Specify data values for second row, then re-execute the statement */
int_data= 1000;
strncpy(str_data, "The most popular open source database", STRING_SIZE);
str_length= strlen(str_data);
small_data= 1000; /* smallint */
is_null= 0; /* reset */
/* Execute the INSERT statement - 2*/
if (mysql_execute(stmt))
{
fprintf(stderr, " mysql_execute, 2 failed/n");
fprintf(stderr, " %s/n", mysql_stmt_error(stmt));
exit(0);
}
/* Get the total rows affected */
affected_rows= mysql_stmt_affected_rows(stmt);
fprintf(stdout, " total affected rows(insert 2): %ld/n", affected_rows);
if (affected_rows != 1) /* validate affected rows */
{
fprintf(stderr, " invalid affected rows by MySQL/n");
exit(0);
}
/* Close the statement */
if (mysql_stmt_close(stmt))
{
fprintf(stderr, " failed while closing the statement/n");
fprintf(stderr, " %s/n", mysql_stmt_error(stmt));
exit(0);
}
mysql_close(mysql);
return 0;
}
附录二 createdb.cpp
#include <windows.h>
#include <iostream>
#include <sqlplus.hh>
int main (int argc, char *argv[]) {
Connection connection(use_exceptions);
try { // the entire main block is one big try block;
if (argc == 1) connection.connect("mysql_cpp_data","localhost","root","");
else if (argc == 2) connection.connect("",argv[1]);
else if (argc == 3) connection.connect("",argv[1],argv[2]);
else if (argc <= 4) connection.connect("",argv[1],argv[2],argv[3]);
// create a new object and connect based on any (if any) arguments
// passed to main();
try {
connection.select_db("mysql_cpp_data");
} catch (BadQuery er) {
// if it couldn't connect to the database assume that it doesn't exist
// and try created it. If that does not work exit with an error.
connection.create_db("mysql_cpp_data");
connection.select_db("mysql_cpp_data");
}
Query query = connection.query(); // create a new query object
try { // ignore any errors here
// I hope to make this simpler soon
query.execute("drop table stock");
} catch (BadQuery er) {}
query << "create table stock (item char(20) not null, num bigint,"
<< "weight double, price double, sdate date)";
query.execute(RESET_QUERY);
// send the query to create the table and execute it. The
// RESET_QUERY tells the query object to reset it self after
// execution
query << "insert into %5:table values (%0q, %1q, %2, %3, %4q)";
query.parse();
// set up the template query I will use to insert the data. The
// parse method call is important as it is what lets the query
// know that this is a template and not a literal string
query.def["table"] = "stock";
// This is setting the parameter named table to stock.
query.execute ("Hamburger Buns", 56, 1.25, 1.1, "1998-04-26");
query.execute ("Hotdogs' Buns" ,65, 1.1 , 1.1, "1998-04-23");
query.execute ("Dinner Roles" , 75, .95, .97, "1998-05-25");
query.execute ("Allen Lee" , 87, 1.5, 1.75, "1998-09-04");
// The last parameter "table" is not specified here. Thus
// the default value for "table" is used which is "stock".
} catch (BadQuery er) { // handle any errors that may come up
cerr << "Error: " << er.error << endl;
return -1;
}
}
附录三 fieldinf.cpp
#include <windows.h>
#include <iostream>
#include <iomanip>
#include <sqlplus.hh>
int main() {
try { // its in one big try block
Connection con(use_exceptions);
con.connect("mysql_cpp_data","localhost","root","");
Query query = con.query();
query << "select * from stock";
Result res = query.store();
cout << "Query: " << query.preview() << endl;
cout << "Records Found: " << res.size() << endl << endl;
cout << "Query Info:/n";
cout.setf(ios::left);
for (unsigned int i = 0; i < res.names().size(); i++) {
cout << setw(2) << i
<< setw(15) << res.names(i).c_str()
// this is the name of the field
<< setw(15) << res.types(i).sql_name()
// this is the SQL identifier name
// Result::types(unsigned int) returns a mysql_type_info which in many
// ways is like type_info except that it has additional sql type
// information in it. (with one of the methods being sql_name())
<< setw(20) << res.types(i).name()
// this is the C++ identifier name which most closely resembles
// the sql name (its is implementation defined and often not very readable)
<< endl;
}
cout << endl;
if (res.types(0) == typeid(string))
cout << "Field 'item' is of an sql type which most closely resembles a/n"
<< "the c++ string type/n";
// this is demonstrating how a mysql_type_info can be compared with a c++
// type_info.
if (res.types(1) == typeid(longlong))
cout << "Field 'num' is of an sql type which most closely resembles a/n"
<< "the c++ long long int type/n";
else if (res.types(1).base_type() == typeid(longlong))
cout << "Field 'num' base type is of an sql type which most closely /n"
<< "resembles a the c++ long long int type/n";
// However you have to be careful as if it can be null the actual type is
// Null<TYPE> not TYPE. So you should always use the base_type method
// to get at the underlying type. If the type is not null than this base
// type would be the same as its type.
return 0;
} catch (BadQuery er) {
cerr << "Error: " << er.error << endl;
return -1;
} catch (BadConversion er) { // handle bad conversions
cerr << "Error: Tried to convert /"" << er.data << "/" to a /""
<< er.type_name << "/"." << endl;
return -1;
}
}
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