SQlite 数据库增删改查-C编程简单实例

/*
@brief 本程序测试sqlite数据库的增删改查
*/

#include "sqlite3.h"
#include <stdio.h>
#include <string.h>

#define _DEBUG_

sqlite3 * pDB = NULL;

//增加用户
int AddUser(const char* sName,int sNameLen, const char* sAge,int sAgeLen);
//删除用户
int DeleteUser(const char* sName,int sNameLen);
//修改用户
int ModifyUser(const char* sName,int sNameLen, const char* sAge,int sAgeLen);
//查找用户
int SelectUser();

int AddUser(const char* sName,int sNameLen, const char* sAge,int sAgeLen)
{
char strSql[500] = {"\0"};
char nameBuff[100] = {"\0"};
char ageBuff[100] = {"\0"};

strncat(nameBuff,sName,sNameLen);
strncat(ageBuff,sAge,sAgeLen);
sprintf(strSql,"insert into user(name,age)values('%s',%s);",nameBuff,ageBuff);
#ifdef _DEBUG_
printf("%d,strSql = %s\n",__LINE__,strSql);
#endif

char* cErrMsg;
int nRes = sqlite3_exec(pDB , strSql ,0 ,0, &cErrMsg);
#ifdef _DEBUG_
if(nRes != SQLITE_OK)
{
printf("%d,strSql = %s\n",__LINE__,strSql);
}

#endif

return 1;
}

int DeleteUser(const char* sName,int sNameLen)
{
#if 0
char strSql = "";
strSql += "delete from user where name='";
strSql += sName;
strSql += "';";
#endif

char strSql[500] = {"\0"};
char nameBuff[100] = {"\0"};

strncat(nameBuff,sName,sNameLen);
sprintf(strSql,"delete from user where name='%s';",nameBuff);
#ifdef _DEBUG_
printf("%d,strSql = %s\n",__LINE__,strSql);
#endif

char* cErrMsg;
int nRes = sqlite3_exec(pDB , strSql ,0 ,0, &cErrMsg);
#ifdef _DEBUG_
if(nRes != SQLITE_OK)
{
printf("%d,strSql = %s\n",__LINE__,strSql);
}

#endif

return 1;
}

int ModifyUser(const char* sName,int sNameLen, const char* sAge,int sAgeLen)
{
#if 0
char strSql = "";
strSql += "update user set age =";
strSql += sAge;
strSql += " where name='";
strSql += sName;
strSql += "';";
#endif
char strSql[500] = {"\0"};
char nameBuff[100] = {"\0"};
char ageBuff[100] = {"\0"};

strncat(nameBuff,sName,sNameLen);
strncat(ageBuff,sAge,sAgeLen);
sprintf(strSql,"update user set age =%s where name='%s';",ageBuff,nameBuff);
#ifdef _DEBUG_
printf("%d,strSql = %s\n",__LINE__,strSql);
#endif

char* cErrMsg;
int nRes = sqlite3_exec(pDB , strSql  ,0 ,0, &cErrMsg);
#ifdef _DEBUG_
if(nRes != SQLITE_OK)
{
printf("%d,strSql = %s\n",__LINE__,strSql);
}

#endif

return 1;
}

static int UserResult(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]);
printf("\t %s",argv[i]);
}
printf("\n");

return 0;
}

int SelectUser()
{
char* cErrMsg;
int nRes = sqlite3_exec(pDB, "select * from user;", UserResult , 0 , &cErrMsg);
#ifdef _DEBUG_
if(nRes != SQLITE_OK)
{
printf("%d,%s\n",__LINE__,cErrMsg);
}

#endif

return 1;
}

int main(int argc, char* argv[])
{
char* cErrMsg;
int nRes = sqlite3_open("test.db", &pDB);
char sql[500];

#ifdef _DEBUG_
if(nRes == SQLITE_OK)
{
printf("%d:Open db test.db success.\n",__LINE__);
}
else
{
printf("%d,%s,%d\n",__LINE__,cErrMsg,nRes);
}
#endif

if(argc <= 1)
{
printf("%d:Please enter your operation command!!\n\n",__LINE__);
printf("(1)create:	create table user.\n");
printf("(2)add [name] [age]:	add to table user.\n");
printf("(3)del [name]:	delet from table user.\n");
printf("(4)modify [name] [age]:	modify from table user.\n");
printf("(5)show:	show table user.\n\n");
return -1;
}

//创建表
if(0 == strcmp(argv[1],"create"))
{
sprintf(sql,"%s"," CREATE TABLE user(name VARCHAR(50),age INTEGER);");
nRes = sqlite3_exec( pDB , sql , 0 , 0 , &cErrMsg );
#ifdef _DEBUG_
if(nRes == SQLITE_OK)
{
printf("%d:Creat table success,table name: user.\n",__LINE__);
}
else
{
printf("%d,%s,%d\n",__LINE__,cErrMsg,nRes);
}
#endif

}

#if 1
//增加
if(0 == strcmp(argv[1],"add"))
{
AddUser(argv[2],strlen(argv[2]), argv[3],strlen(argv[3]));
}
//删除
if(0 == strcmp(argv[1],"del"))
{
DeleteUser(argv[2],strlen(argv[2]));
}

//修改
if(0 == strcmp(argv[1],"modify"))
{
ModifyUser(argv[2],strlen(argv[2]),argv[3],strlen(argv[3]));
}

//查看
if(0 == strcmp(argv[1],"show"))
{
printf("\t*name*\t*age*\n");
SelectUser();
}
#endif

sqlite3_close(pDB);

return 0;
}

[root@none:/mnt/nfs]# ./appsqlite
165:Open db test.db success.
175:Please enter your operation command!!

(1)create:      create table user.
(2)add [name] [age]:    add to table user.
(3)del [name]:  delet from table user.
(4)modify [name] [age]: modify from table user.
(5)show:        show table user.

[root@none:/mnt/nfs]# ./appsqlite show
165:Open db test.db success.
*name*  *age*
vivo    123
xiaomi  8
[root@none:/mnt/nfs]#