数据库存储通讯录，实现“增删改查”
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/************************************************************************* > File Name: addressbook.c > Author: hhp > Created Time: 2017年07月04日 星期二 14时34分43秒 ************************************************************************/#include <stdio.h>#include <stdlib.h>#include <sqlite3.h>#include <string.h>#include <unistd.h>int age;char name[20];char sex[2];char number[20];void menu(sqlite3 *db);void insert(sqlite3 *db);void delete(sqlite3 *db);void update(sqlite3 *db);void query(sqlite3 *db);void showtable(sqlite3 *db);int main(){ int ret; sqlite3 *db; char *errmsg; ret = sqlite3_open("address.db", &db); if (ret != SQLITE_OK) { perror("open"); exit(1); } char sql_create[] = "create table stu(name text, sex text, age integer, number text);"; ret = sqlite3_exec(db, sql_create, NULL, NULL, &errmsg); if (ret != SQLITE_OK) { perror("create"); printf("error: %s\n", errmsg); exit(2); } menu(db); ret = sqlite3_close(db); if (ret != SQLITE_OK) { perror("close"); exit(3); } return 0;}void menu(sqlite3 *db){ int sel; printf(" welcome to my addressbook!\n\n" ); printf("----------------------------------------------\n"); printf("1:add information | 2:delete information\n"); printf("3:update information | 4:query information\n"); printf("5:show all information | 0:exit the system \n"); printf("----------------------------------------------\n"); printf("\n"); printf("please input your choice:"); //scanf("%d", &sel); while (scanf("%d", &sel) == 1) { if (0 == sel) { printf("===>thanks for you to use!\n"); sleep(1); printf("byebye-_- -_-\n"); break; } switch (sel) { case 1: { insert(db); break; } case 2: { delete(db); break; } case 3: { update(db); break; } case 4: { query(db); break; } case 5: { showtable(db); break; } default: { printf("your input is error, please input again!!\n"); break; } } }}void insert(sqlite3 *db){ int ret; char *errmsg; char sql_insert[1024] = {0}; printf("please input name:\n"); scanf("%s", name); printf("please input sex(m/f):\n"); scanf("%s", sex); printf("please input age:\n"); scanf("%d", &age); printf("please input number:\n"); scanf("%s", number); sprintf(sql_insert, "insert into stu values('%s','%s','%d','%s');", name, sex, age, number); ret = sqlite3_exec(db, sql_insert, NULL, NULL, &errmsg); if (ret != SQLITE_OK) { perror("insert"); exit(1); } printf("insert sucess!\n"); memset(name, 0, 20); memset(sex, 0, 2); memset(number, 0, 20);}void delete(sqlite3 *db){ int ret, sel; char *errmsg; char sql_delete[1024] = {0}; printf("1.delete by name 2.delete by number\n"); printf("please input your choice:"); scanf("%d", &sel); switch (sel) { case 1: { printf("input the name to delete\n"); scanf("%s", name); sprintf(sql_delete, "delete from stu where name = '%s';", name); ret = sqlite3_exec(db, sql_delete, NULL, NULL, &errmsg); if (ret != SQLITE_OK) { perror("delete"); exit(1); } printf("delete sucessfully!\n"); memset(name, 0, 20); break; } case 2: { printf("input the number to delete\n"); scanf("%s", number); sprintf(sql_delete, "delete from stu where number = '%s';", number); ret = sqlite3_exec(db, sql_delete, NULL, NULL, &errmsg); if (ret != SQLITE_OK) { perror("delete"); exit(1); } printf("delete sucessfully!\n"); memset(number, 0, 20); break; } default: { printf("please input sel(1 or 2)\n"); break; } }}void update(sqlite3 *db){ int ret, sel; int updateage; char *errmsg; char sql_update[1024] = {0}; char updatename[1024] = {0}; char updatesex[1024] = {0}; char updatenumber[1024] = {0}; printf("1.update by name 2.update by number\n"); printf("please input your choice:"); scanf("%d", &sel); switch (sel) { case 1: { printf("input the name to update\n"); scanf("%s", name); printf("1.update name 2.update sex 3.update age 4.update number\n"); printf("input your choice:"); scanf("%d", &sel); switch (sel) { case 1: { printf("please input name\n"); scanf("%s", updatename); sprintf(sql_update, "update stu set name = '%s'where name = '%s';", updatename, name); ret = sqlite3_exec(db, sql_update, NULL, NULL, &errmsg); if (ret != SQLITE_OK) { perror("update11"); exit(1); } printf("update successfully!\n"); memset(name, 0, 20); break; } case 2: { printf("please input sex\n"); scanf("%s", updatesex); sprintf(sql_update, "update stu set sex = '%s'where name = '%s';", updatesex, name); ret = sqlite3_exec(db, sql_update, NULL, NULL, &errmsg); if (ret != SQLITE_OK) { perror("update12"); exit(1); } printf("update successfully!\n"); memset(name, 0, 20); break; } case 3: { printf("please input age\n"); scanf("%d", &updateage); sprintf(sql_update, "update stu set age = '%d'where name = '%s';", updateage, name); ret = sqlite3_exec(db, sql_update, NULL, NULL, &errmsg); if (ret != SQLITE_OK) { perror("update13"); exit(1); } printf("update successfully!\n"); memset(name, 0, 20); break; } case 4: { printf("please input number\n"); scanf("%s", updatenumber); sprintf(sql_update, "update stu set number = '%s'where name = '%s';", updatenumber, name); ret = sqlite3_exec(db, sql_update, NULL, NULL, &errmsg); if (ret != SQLITE_OK) { perror("update14"); exit(1); } printf("update successfully!\n"); memset(name, 0, 20); break; } default: { printf("please input sel(1,2,3,4)!\n"); break; } } } case 2: { printf("input the number to update\n"); scanf("%s", number); printf("1.update name 2.update sex 3.update age 4.update number\n"); printf("input your choice:"); scanf("%d", &sel); switch (sel) { case 1: { printf("please input name\n"); scanf("%s", updatename); sprintf(sql_update, "update stu set name = '%s'where name = '%s';", updatename, name); ret = sqlite3_exec(db, sql_update, NULL, NULL, &errmsg); if (ret != SQLITE_OK) { perror("update21"); exit(1); } printf("update successfully!\n"); memset(number, 0, 20); break; } case 2: { printf("please input sex\n"); scanf("%s", updatesex); sprintf(sql_update, "update stu set sex = '%s'where name = '%s';", updatesex, name); ret = sqlite3_exec(db, sql_update, NULL, NULL, &errmsg); if (ret != SQLITE_OK) { perror("update22"); exit(1); } printf("update successfully!\n"); memset(number, 0, 20); break; } case 3: { printf("please input age\n"); scanf("%d", &updateage); sprintf(sql_update, "update stu set age = '%d'where name = '%s';", updateage, name); ret = sqlite3_exec(db, sql_update, NULL, NULL, &errmsg); if (ret != SQLITE_OK) { perror("update23"); exit(1); } printf("update successfully!\n"); memset(number, 0, 20); break; } case 4: { printf("please input number\n"); scanf("%s", updatenumber); sprintf(sql_update, "update stu set number = '%s'where name = '%s';", updatenumber, name); ret = sqlite3_exec(db, sql_update, NULL, NULL, &errmsg); if (ret != SQLITE_OK) { perror("update24"); exit(1); } printf("update successfully!\n"); memset(number, 0, 20); break; } default: { printf("please input sel(1,2,3,4)!\n"); break; } } } default: { printf("please input sel(1 or 2)!\n"); break; } }}void query(sqlite3 *db){ int sel; int ret, i, j; int row, column; char *errmsg; char **result; char sql_query[1024] = {0}; printf("1.query by name 2.query by number\n"); printf("please input your choice:"); scanf("%d", &sel); switch (sel) { case 1: { printf("input the name to query\n"); scanf("%s", name); sprintf(sql_query, "select * from stu where name = '%s';", name); ret = sqlite3_get_table(db, sql_query, &result, &row, &column, &errmsg); if (ret != SQLITE_OK) { perror("query1"); exit(1); } for (i = 0; i <= row; i++) { for (j = 0; j < column; j++) { printf("%s |", result[i * column + j]); } printf("\n"); } printf("query successfully!\n"); memset(name, 0, 20); break; } case 2: { printf("input the number to query\n"); scanf("%s", number); sprintf(sql_query, "select * from stu where number = '%s';", number); ret = sqlite3_get_table(db, sql_query, &result, &row, &column, &errmsg); if (ret != SQLITE_OK) { perror("query2"); exit(1); } for (i = 0; i <= row; i++) { for (j = 0; j < column; j++) { printf("%s |", result[i * column + j]); } printf("\n"); } printf("query successfully!\n"); memset(number, 0, 20); break; } }}void showtable(sqlite3 *db){ int i, j, ret; char *errmsg; int row, column; char **result; char sql_select[] = "select * from stu;"; ret = sqlite3_get_table(db, sql_select, &result, &row, &column, &errmsg); if (ret != SQLITE_OK) { perror("showtable"); exit(1); } for (i = 0; i <= row; i++) { for (j = 0; j < column; j++) { printf("%s |", result[i * column + j]); } printf("\n"); }}阅读全文
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