#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sqlite3.h>
int main( int argc,char **argv )
{
sqlite3 *db;
sqlite3_stmt * stmt;
const char *zTail;
//打开数据库
int r = sqlite3_open("MysqLite.db",&db);
if(r){
printf("%s",sqlite3_errmsg(db));
}
else
printf("open db sccess!\n");
//创建Table
//sqlite3_prepare()将sql语句编译为sqlite内部一个结构体(sqlite3_stmt),
//该结构体中包含了将要执行的sql语句的信息
//第四个参数用来指向输入参数中下一个需要编译的sql语句存放的 sqlite statement 对象的指针
sqlite3_prepare(db,
"CREATE TABLE players ( ID INTEGER PRIMARY KEY,name TEXT,age INTEGER);",
-1,&stmt,&zTail);
printf("prepared has done\n");
//调用sqlite3_step(),此时sql语句才真正执行,执行成功,返回sqlITE_DONE或sqlITE_ROW.
//每次调用sqlite3_step(),只返回一行数据,使用sqlite3_column_XXX()函数来取出这些数据
//要取出全部的数据,则需要反复调用sqlite3_step()
sqlite3_step(stmt);
//调用sqlite3_finalize(),释放stmt占用的内存,该内存是在sqlite3_prepare()时分配的
//如果sql语句要重复使用,可以调用sqlite3_reset()来清除已经绑定的参数
sqlite3_finalize(stmt);
printf("create table success!\n");
//插入数据
sqlite3_prepare(db,
"INSERT INTO players (name,age) VALUES(?,?);",&zTail);
char str[] = "Kevin";
int n = 23;
//sqlite3_bind_xxx的第四个参数为负,则字符串长度由第一个0终止的位数决定
//sqlITE_STATIC表示命令执行完后的信息为static类型,不能被改动,而且不需要被free
sqlite3_bind_text(stmt,1,str,-1,sqlITE_STATIC);
sqlite3_bind_int(stmt,2,n);
r = sqlite3_step(stmt);
if( r!=sqlITE_DONE){
printf("%s",sqlite3_errmsg(db));
}
//清除已经绑定的参数
sqlite3_reset(stmt);
//插入第二个数据
char str2[] = "Jack";
int n2 = 16;
sqlite3_bind_text(stmt,str2,n2);
r = sqlite3_step(stmt);
if( r!=sqlITE_DONE){
printf("%s",sqlite3_errmsg(db));
}
sqlite3_finalize(stmt); //释放stmt所占的内存
//查询所有数据
sqlite3_prepare(db,
"SELECT ID,name,age FROM players ORDER BY age",&zTail);
r = sqlite3_step(stmt);
int number;
int id;
const unsigned char * name;
while( r == sqlITE_ROW ){
id = sqlite3_column_int( stmt,0 );
name = sqlite3_column_text( stmt,1 );
number = sqlite3_column_int( stmt,2 );
printf("ID: %d Name: %s Age: %d \n",id,number);
sleep(1);
r = sqlite3_step(stmt);
}
sqlite3_finalize(stmt);
sqlite3_close(db);
return 0;
}
编译运行:
$ gcc sqlite.c –o sqlite –lsqlite3
$ ./sqlite