如何在Linux下用C语言操作数据库sqlite3

发布网友 发布时间:2022-04-21 20:26

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热心网友 时间:2022-04-08 00:04

下面我们看看怎么在C语言中向数据库插入数据。
  好的,我们现编辑一段c代码,取名为 insert.c
// name: insert.c
// This prog is used to test C/C++ API for sqlite3 .It is very simple,ha !
// Author : zieckey All rights reserved.
// data : 2006/11/18
#include <stdio.h>
#include <stdlib.h>
#include "sqlite3.h"
#define _DEBUG_
int main( void )
{
sqlite3 *db=NULL;
char *zErrMsg = 0;
int rc;
rc = sqlite3_open("zieckey.db", &db); //打开指定的数据库文件,如果不存在将创建一个同名的数据库文件
if( rc )
{
fprintf(stderr, "Can't open database: %s
", sqlite3_errmsg(db));
sqlite3_close(db);
exit(1);
}
else printf("You have opened a sqlite3 database named zieckey.db successfully!
Congratulations! Have fun ! ^-^
");
//创建一个表,如果该表存在,则不创建,并给出提示信息,存储在 zErrMsg 中
char *sql = " CREATE TABLE SensorData(
ID INTEGER PRIMARY KEY,
SensorID INTEGER,
SiteNum INTEGER,
Time VARCHAR(12),
SensorParameter REAL
);" ;
sqlite3_exec( db , sql , 0 , 0 , &zErrMsg );
#ifdef _DEBUG_
printf("%s
",zErrMsg);
#endif
//插入数据
sql = "INSERT INTO "SensorData" VALUES( NULL , 1 , 1 , '200605011206', 18.9 );" ;
sqlite3_exec( db , sql , 0 , 0 , &zErrMsg );
sql = "INSERT INTO "SensorData" VALUES( NULL , 1 , 1 , '200605011306', 16.4 );" ;
sqlite3_exec( db , sql , 0 , 0 , &zErrMsg );
sqlite3_close(db); //关闭数据库
return 0;
}

  好的,将上述代码写入一个文件,并将其命名为 insert.c 。
  解释:
  sqlite3_exec的函数原型说明如下:
int sqlite3_exec(
sqlite3*,
const char *sql,
sqlite_callback,
void *,
char **errms

g
);

  编译:
  [root@localhost temp]# gcc insert.c -lsqlite3 -L/usr/local/sqlite3/lib -I/usr/local/sqlite3/include
  insert.c:28:21: warning: multi-line string literals are deprecated
  [root@localhost temp]#
  执行
  [root@localhost temp]# ./a.out
  ./a.out: error while loading shared libraries: libsqlite3.so.0: cannot open shared object file: No such file or directory
  [root@localhost temp]#
  同样的情况,如上文处理方法:
  [root@localhost temp]# export LD_LIBRARY_PATH=/usr/local/sqlite3/lib:$LD_LIBRARY_PATH
  [root@localhost temp]# ./a.out
  You have opened a sqlite3 database named zieckey.db successfully!
  Congratulations! Have fun ! ^-^
  (null)
  (null)
  (null)
  [root@localhost temp]#
  运行成功了,好了,现在我们来看看是否插入了数据
  [root@localhost temp]# /usr/local/sqlite3/bin/sqlite3 zieckey.db
  SQLite version 3.3.8
  Enter ".help" for instructions
  sqlite> select * from SensorData;
  1|1|1|200605011206|18.9

  2|1|1|200605011306|16.4
  sqlite>

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