main.cpp

来自「c调用sqlite的完整的程序」· C++ 代码 · 共 79 行

#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\n", sqlite3_errmsg(db));
  sqlite3_close(db);
  return (1);
 }
 else printf("You have opened a sqlite3 database named zieckey.db successfully!\nCongratulations! Have fun !  ^-^ \n");
 

 //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("zErrMsg = %s \n", 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 , 23 , 45 , '200605011306', 16.4 );" ;
 sqlite3_exec( db , sql , 0 , 0 , &zErrMsg );
 
 sql = "INSERT INTO \"SensorData\" VALUES(NULL , 34 , 45 , '200605011306', 15.4 );" ;
 sqlite3_exec( db , sql , 0 , 0 , &zErrMsg );
 
  
 int nrow = 0, ncolumn = 0;
 char **azResult; //二维数组存放结果

 //查询数据
 sql = "SELECT * FROM SensorData ";
 sqlite3_get_table( db , sql , &azResult , &nrow , &ncolumn , &zErrMsg );
 int i = 0 ;
 printf( "row:%d column=%d \n" , nrow , ncolumn );
 printf( "\nThe result of querying is : \n" );
 for( i=0 ; i<( nrow + 1 ) * ncolumn ; i++ )
  printf( "azResult[%d] = %s\n", i , azResult[i] );

 //删除数据
 sql = "DELETE FROM SensorData WHERE SensorID = 1 ;" ;
 sqlite3_exec( db , sql , 0 , 0 , &zErrMsg );
 #ifdef _DEBUG_
        printf("zErrMsg = %s \n", zErrMsg);
    #endif
 sql = "SELECT * FROM SensorData ";
 sqlite3_get_table( db , sql , &azResult , &nrow , &ncolumn , &zErrMsg );
 printf( "\n\n\n\nrow:%d column=%d " , nrow , ncolumn );
 printf( "\nAfter deleting , the result of querying is : \n" );
 for( i=0 ; i<( nrow + 1 ) * ncolumn ; i++ )
  printf( "azResult[%d] = %s\n", i , azResult[i] );


 //释放掉  azResult 的内存空间
 sqlite3_free_table( azResult );
  
 #ifdef _DEBUG_
        printf("zErrMsg = %s \n", zErrMsg);
    #endif

 sqlite3_close(db); //关闭数据库
 return 0;
}