@H_
301_0@最后一节,这里记录下如何
删除数据。
@H_
301_0@前面所有的
代码都继承在这里了,在Ubuntu14.04和Mac10.9上亲测通过。
@H_
301_0@
#include <stdio.h>
#include <stdlib.h>
#include "sqlite/sqlite3.h"
#define DB_NANE "sqlite/test.db"
sqlite3 *db = NULL;
char* sql = NULL;
char *zErrMsg = NULL;
const char* data = "Callback function called";
int ret = 0;
typedef enum{
false,true
} bool;
/*
typedef int (*sqlite3_callback)(
void*,Data provided in the 4th argument of sqlite3_exec()
int,The number of columns in row
char**,An array of strings representing fields in the row
char** An array of strings representing column names
);
*/
static int callback(void *NotUsed,int argc,char **argv,char **azColName)
{
int i = 0;
for(i=0; i < argc; i++){
printf("%s = %s\n",azColName[i],argv[i] ? argv[i] : "NULL");
}
printf("\n");
return 0;
}
bool connectDB()
{
ret = sqlite3_open(DB_NANE,&db);
if( ret != sqlITE_OK){
fprintf(stderr,"Error open database: %s\n",sqlite3_errmsg(db));
sqlite3_free(zErrMsg);
return false;
}
fprintf(stdout,"Successfully opened database\n");
return true;
}
bool createTable()
{
/* Create sql statement */
sql = "CREATE TABLE COMPANY(" \
"ID INT PRIMARY KEY NOT NULL," \
"NAME TEXT NOT NULL," \
"AGE INT NOT NULL," \
"ADDRESS CHAR(50)," \
"SALARY REAL );";
/* Execute sql statement */
ret = sqlite3_exec(db,sql,callback,&zErrMsg);
if( ret != sqlITE_OK ){
fprintf(stderr,"Error sql: %s\n",zErrMsg);
sqlite3_free(zErrMsg);
return false;
}
fprintf(stdout,"Successfully table created\n");
return true;
}
bool insertRecords()
{
/* Create sql statement */
sql = "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) " \
"VALUES (1,'Paul',32,'California',20000.00 ); " \
"INSERT INTO COMPANY (ID,SALARY) " \
"VALUES (2,'Allen',25,'Texas',15000.00 ); " \
"INSERT INTO COMPANY (ID,SALARY)" \
"VALUES (3,'Teddy',23,'Norway',20000.00 );" \
"INSERT INTO COMPANY (ID,SALARY)" \
"VALUES (4,'Mark','Rich-Mond ',65000.00 );";
/* Execute sql statement */
ret = sqlite3_exec(db,"sql error: %s\n",zErrMsg);
sqlite3_free(zErrMsg);
return false;
}
fprintf(stdout,"successfully records created\n");
return true;
}
bool selectFromTable()
{
/* Create sql statement */
sql = "SELECT * from COMPANY";
/* Execute sql statement */
ret = sqlite3_exec(db,(void*)data,"successfully operation done\n");
return true;
}
bool updateTable()
{
/* Create merged sql statement */
sql = "UPDATE COMPANY set SALARY = 25000.00 where ID=1; " \
"SELECT * from COMPANY";
/* Execute sql statement */
ret = sqlite3_exec(db,"Successfully operation done \n");
return true;
}
bool deleteTable()/*新加*/
{
/* Create merged sql statement */
sql = "DELETE from COMPANY where ID=2; " \
"SELECT * from COMPANY";
/* Execute sql statement */
ret = sqlite3_exec(db,"Successfully operation done\n");
return true;
}
bool closeDB()
{
int ret = 0;
ret = sqlite3_close(db);
if ( ret == sqlITE_BUSY ){
return false;
}
return true;
}
int main(int argc,char* argv[])
{
connectDB();
/*createTable();*/
/*insertRecords();*/
selectFromTable();
/*updateTable();*/
deleteTable();
selectFromTable();
closeDB();
return 0;
}