1、思维导图
2sqlite3在linux中是实现数据的增删，改
#include
int main(int argc, const char *argv[]) { //1、定义一个数据库句柄指针 sqlite3* ppDb =NULL; //2、创建或打开数据库 if(sqlite3_open("./mydb.db",&ppDb)!=SQLITE_OK) { printf("sqlite3_open error\n"); return -1; } printf("数据库成功打开\n"); // //3、创建数据表 //3.1、准备sql语句 char sql[128]="create table if not exists student(student_id int ,name char,sex char ,score double);"; char *errmsg =NULL; if(sqlite3_exec(ppDb,sql,NULL,NULL,&errmsg)!=SQLITE_OK) { printf("%s\n",errmsg); return -1; } printf("数据表创建成功\n"); int a=0;
int a1=0; char a2[20]=""; char a3[5]=""; int a4=0; printf("*****学生信息***********\n"); printf("*****1、添加学生信息****\n"); printf("*****2、修改学生信息*****\n"); printf("*****3、删除学生信息*****\n"); printf("*****4、查找学生信息******\n"); printf("*****0、退出系统**********\n"); printf("请输入》》》："); scanf("%d",&a);
switch(a) { case 1: { printf("请输入信息："); scanf("%d %s %s %d",&a1,a2,a3,&a4); getchar(); sprintf(sql,"insert into student values(%d,\"%s\",\"%s\",%d);",a1,a2,a3,a4);
if(sqlite3_exec(ppDb,sql,NULL,NULL,&errmsg)!=SQLITE_OK) { printf("%s\n",errmsg); return -1; } break;
} case 2: { printf("请输入学号和姓名："); scanf("%d %s %s %d",a1,a2,a3,a4); getchar(); sprintf(sql,"UPDATE TABLE student student_id=%d AND name=\"%s\" WHERE sex=\"%s\" %d;",a1,a2,a3,a4); if(sqlite3_exec(ppDb,sql,NULL,NULL,&errmsg)!=SQLITE_OK) { printf("%s\n",errmsg); return -1; } break;
} case 3: { printf("请输入信息："); scanf("%s",a2); getchar(); sprintf(sql,"DELETE FROM student WHERE name=\"%s\"",a2); if(sqlite3_exec(ppDb,sql,NULL,NULL,&errmsg)!=SQLITE_OK) { printf("%s\n",errmsg); return -1; } break; }
case 0: { sprintf(sql,"DROP TABLE student;"); if(sqlite3_exec(ppDb,sql,NULL,NULL,&errmsg)!=SQLITE_OK) { printf("%s\n",errmsg); return -1; } break;
}
}
sqlite3_close(ppDb); return 0; }
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