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CHAPTER 6 EMBEDDED MYSQL
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Defining the class was the easy part. Completing the code for all of these methods is a little harder. Instead of starting from scratch, I used the code from the first example and changed it into the database class source code. Listing 6-13 shows the complete source code for the database class. Notice that I ve used the same global (well, local to this source) variables and arrays of characters for the initialization and startup options. This part should look very familiar to you. Take some time to read through this code. When you are done, I ll explain some of the grittier details. Listing 6-13. Database Engine Class (DBEngine.cpp) #pragma unmanaged #include #include #include #include #include "DBEngine.h" <stdlib.h> <stdio.h> "my_global.h" "mysql.h" //the embedded server class //stores results from queries //a single row in a result set //used to control iterator
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MYSQL *mysql; MYSQL_RES *results; MYSQL_ROW record; bool IteratorStarted; MYSQL_RES *ExecQuery(char *Query); /*
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These variables set the location of the ini file and data stores. */ static char *server_options[] = {"mysql_test", "--defaults-file=c:\\mysql_embedded\\my.ini", "--datadir=c:\\mysql_embedded\\data" }; int num_elements=sizeof(server_options) / sizeof(char *); static char *server_groups[] = {"libmyswld_server", "libmysqld_client" }; DBEngine::DBEngine(void) { mysqlError = false; } DBEngine::~DBEngine(void) { } const char *DBEngine::GetError() { return (mysql_error(mysql)); mysqlError = false; }
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CHAPTER 6 EMBEDDED MYSQL
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bool DBEngine::Error() { return(mysqlError); } char *DBEngine::GetBookFieldStr(int Slot, char *Field) { char *istr = new char[10]; char *str = new char[128]; _itoa_s(Slot, istr, 10, 10); strcpy_s(str, 128, "SELECT "); strcat_s(str, 128, Field); strcat_s(str, 128, " FROM books WHERE Slot = "); strcat_s(str, 128, istr); mysqlError = false; results=ExecQuery(str); strcpy_s(str, 128, ""); if (results) { mysqlError = false; record=mysql_fetch_row(results); if(record) { strcpy_s(str, 128, record[0]); } else { mysqlError = true; } } return (str); } char *DBEngine::GetBookFieldText(int Slot, char *Field) { char *istr = new char[10]; char *str = new char[128]; _itoa_s(Slot, istr, 10, 10); strcpy_s(str, 128, "SELECT "); strcat_s(str, 128, Field); strcat_s(str, 128, " FROM books WHERE Slot = "); strcat_s(str, 128, istr); mysqlError = false; results=ExecQuery(str); delete str;
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CHAPTER 6 EMBEDDED MYSQL
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if (results) { mysqlError = false; record=mysql_fetch_row(results); if(record) { return (record[0]); } else { mysqlError = true; } } return (""); } int DBEngine::GetBookFieldInt(int Slot, char *Field) { char *istr = new char[10]; char *str = new char[128]; int qty = 0; _itoa_s(Slot, istr, 10, 10); strcpy_s(str, 128, "SELECT "); strcat_s(str, 128, Field); strcat_s(str, 128, " FROM books WHERE Slot = "); strcat_s(str, 128, istr); results=ExecQuery(str); if (results) { record=mysql_fetch_row(results); if(record) { qty = atoi(record[0]); } else { mysqlError = true; } } delete str; return (qty); } void DBEngine::VendBook(char *ISBN) { char *str = new char[128];
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CHAPTER 6 EMBEDDED MYSQL
char *istr = new char[10]; int qty = 0; strcpy_s(str, 128, "SELECT Quantity FROM books WHERE ISBN = '"); strcat_s(str, 128, ISBN); strcat_s(str, 128, "'"); results=ExecQuery(str); record=mysql_fetch_row(results); if (record) { qty = atoi(record[0]); if (qty >= 1) { _itoa_s(qty - 1, istr, 10, 10); strcpy_s(str, 128, "UPDATE books SET Quantity = "); strcat_s(str, 128, istr); strcat_s(str, 128, " WHERE ISBN = '"); strcat_s(str, 128, ISBN); strcat_s(str, 128, "'"); results=ExecQuery(str); } } else { mysqlError = true; } } void DBEngine::Initialize() { /* This section initializes the server and sets server options. */ mysql_server_init(num_elements, server_options, server_groups); mysql = mysql_init(NULL); if (mysql) { mysql_options(mysql, MYSQL_READ_DEFAULT_GROUP, "libmysqld_client"); mysql_options(mysql, MYSQL_OPT_USE_EMBEDDED_CONNECTION, NULL); /* The following call turns debugging on programmatically. Comment out to turn off debugging. */ //mysql_debug("d:t:i:O,\\mysqld_embedded.trace"); /* Connect to embedded server. */
CHAPTER 6 EMBEDDED MYSQL
if(mysql_real_connect(mysql, NULL, NULL, NULL, "information_schema", 0, NULL, 0) == NULL) { mysqlError = true; } else { mysql_query(mysql, "use BVM;"); } } else { mysqlError = true; } IteratorStarted = false; } void DBEngine::Shutdown() { /* Now close the server connection and tell server we're done (shutdown). */ mysql_close(mysql); mysql_server_end(); } char *DBEngine::GetSetting(char *Field) { char *str = new char[128]; strcpy_s(str, 128, "SELECT * FROM settings WHERE FieldName = '"); strcat_s(str, 128, Field); strcat_s(str, 128, "'"); results=ExecQuery(str); strcpy_s(str, 128, ""); if (results) { record=mysql_fetch_row(results); if (record) { strcpy_s(str, 128, record[1]); } } else { mysqlError = true; } return (str); }
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