CRUD

struct student

  1. typedef struct STUDENT {
  2.     unsigned int id;
  3.     unsigned char name[16];
  4.     unsigned int age;
  5.     unsigned char address[64];
  6. } Student;

create table

  1. CREATE TABLE IF NOT EXISTS student(
  2.     `id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
  3.     `name`          TEXT    NOT NULL,
  4.     `age`            INT     NOT NULL,
  5.     `address`      TEXT NOT NULL
  6. )
  1. int createTable(sqlite3 *db) {
  2.     char *result = {0};
  3.     char *sql = "CREATE TABLE IF NOT EXISTS student("\
  4.          "`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL," \
  5.          "`name`          TEXT    NOT NULL," \
  6.          "`age`            INT     NOT NULL," \
  7.          "`address`      TEXT NOT NULL);";
  8.     int r = sqlite3_exec(db, sql, NULL, 0, &result);
  9.     if (r == SQLITE_OK) {
  10.         printf("create table success!\n");
  11.     }
  12.     return r;
  13. }

generate student data

  1. void generateStudent(Student *student, int count) {
  2. //    int count = 100;
  3. //    Student student[count];
  4.     int i = 0;
  5.     for (; i < count; i++) {
  6.         unsigned char name[16] = {0};
  7.         unsigned char address[64] = {0};
  8.         sprintf((char *) name, "zing%d", i);
  9.         sprintf((char *) address, "jiangsu-wuxi-%d", i);
  10.         student[i].id = (unsigned int) (1000 + i);
  11.         memcpy(student[i].name, name, sizeof(name));
  12.         student[i].age = (unsigned int) (10 + i);
  13.         memcpy(student[i].address, address, sizeof(address));
  14.         printf("%d-%s-%d-%s\n", student[i].id, student[i].name, student[i].age, student[i].address);
  15.     }
  16. //    printf("----------==ok---------\n");
  17. //    for (i = 0; i < count; ++i) {
  18. //        printf("id:%d,name:%s,age:%d,address:%s\n", student[i].id, student[i].name, student[i].age, student[i].address);
  19. //    }
  20. }

insert table

  1. int insertTable(sqlite3 *db, Student student) {
  2.     char sql[128], *result = {0};
  3.     sprintf(sql, "INSERT INTO student (`name`,`age`,`address`) VALUES('%s','%d','%s')", student.name, student.age,
  4.             student.address);
  5.     int rc = sqlite3_exec(db, sql, NULL, 0, &result);
  6.     if (rc != SQLITE_OK) {
  7.         fprintf(stderr, "SQL error: %s\n", result);
  8.         sqlite3_free(result);
  9.     } else {
  10.         printf("insert ok!\n");
  11.     }
  12.     return rc;
  13. }

query table 1

  1. int queryTable(sqlite3 *db, Student *student, int index, int count) {
  2.     char sql[128];
  3.     if (count > 10)
  4.         count = 10;
  5.     sprintf(sql, "select * from student order by id desc limit %d,%d", index, count);
  6.     printf("%s\n", sql);
  7.     char *err = NULL;
  8.     int col, row, i, j = 0;
  9.     char **result;
  10.     int rs = sqlite3_get_table(db, sql, &result, &row, &col, &err);
  11.     if (rs == SQLITE_OK) {
  12.         printf("row %d, col %d\n", row, col);
  13. //        id-name-age-address
  14. //        printf("%s-%s-%s-%s\n", result[0], result[1], result[2], result[3]);
  15. //        1-zing0-10-jiangsu-wuxi-0
  16. //        printf("%s-%s-%s-%s\n", result[4], result[5], result[6], result[7]);
  17. //        printf("%s-%s-%s-%s\n", result[1120], result[1121], result[1122], result[1123]);
  18. //        for (i = 0; i < (row + 1) * col; i++) {
  19. //            printf("%s\n", result[i]);
  20. //        }
  21.         for (i = 0; i < (row + 1) * col; i++) {
  22.             if (i % col == 0 && i >= col) {
  23.                 student[j].id = (unsigned int) atoi(result[i]);
  24.                 memcpy(student[j].name, result[i + 1], sizeof(student[i].name));
  25.                 student[j].age = (unsigned int) atoi(result[i + 2]);
  26.                 memcpy(student[j].address, result[i + 3], sizeof(student[i].address));
  27. //                printf("id:%d,name:%s,age:%d,address:%s\n", student[j].id, student[j].name, student[j].age, student[j].address);
  28. //                printf("id:%s,name:%s,age:%s,address:%s\n", result[i], result[i + 1], result[i + 2], result[i + 3]);
  29.                 j++;
  30.             }
  31.         }
  32.     } else {
  33.         printf("error\n");
  34.     }
  35.     return rs;
  36. }

query table 2

  1. /*
  2.  * @param stu
  3.  * @param argc
  4.  * @param argv
  5.  * @param azColName
  6.  * @return
  7.  */
  8. int queryCallback(void *stu, int argc, char **argv, char **azColName) {
  9.     static int j;
  10.     Student *student = stu;
  11.     student[j].id = (unsigned int) atoi(argv[0]);
  12.     memcpy(student[j].name, argv[1], sizeof(student[j].name));
  13.     student[j].age = (unsigned int) atoi(argv[2]);
  14.     memcpy(student[j].address, argv[3], sizeof(student[j].address));
  15.     j++;
  16. //    printf("\n");
  17. //    for (i = 0; i < argc; i++) {
  18. //        printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
  19. //    }
  20. //    printf("argc-->%d\n",argc);
  21.     return 0;
  22. }
  24. int query(sqlite3 *db, Student *student, int index, int count) {
  25.     char sql[128];
  26.     sprintf(sql, "select * from student order by id desc limit %d,%d;", index, count);
  27.     char **err = NULL;
  28.     return sqlite3_exec(db, sql, queryCallback, student, err);
  29. }

update table

  1. int update(sqlite3 *db, Student student) {
  3.     char sql[128];
  4.     sprintf(sql, "UPDATE student set address = '%s' where ID=%d;", student.address, student.id);
  5.     char *err = NULL;
  6.     /* Execute SQL statement */
  7.     int rc = sqlite3_exec(db, sql, NULL, (void *) 0, &err);
  8.     if (rc != SQLITE_OK) {
  9.         fprintf(stderr, "SQL error: %s\n", err);
  10.         sqlite3_free(err);
  11.     } else {
  12.         fprintf(stdout, "Operation done successfully\n");
  13.     }
  14.     return rc;
  15. }
  16. int update2(sqlite3 *db, int id, char *address) {
  18.     char sql[128];
  19.     sprintf(sql, "UPDATE student set address = '%s' where ID=%d;", address, id);
  20.     char *err = NULL;
  21.     /* Execute SQL statement */
  22.     int rc = sqlite3_exec(db, sql, NULL, (void *) 0, &err);
  23.     if (rc != SQLITE_OK) {
  24.         fprintf(stderr, "SQL error: %s\n", err);
  25.         sqlite3_free(err);
  26.     } else {
  27.         fprintf(stdout, "Operation done successfully\n");
  28.     }
  29.     return rc;
  30. }
  32. int update3(sqlite3 *db, void *data) {
  33.     Student *student = (Student *) data;
  34.     printf("-->  %d\n", student->id);
  35.     printf("-->  %s\n", student->address);
  36.     char sql[128];
  37.     sprintf(sql, "UPDATE student set address = '%s' where ID=%d;", student->address, student->id);
  38.     char *err = NULL;
  39.     /* Execute SQL statement */
  40.     int rc = sqlite3_exec(db, sql, NULL, (void *) 0, &err);
  41.     if (rc != SQLITE_OK) {
  42.         fprintf(stderr, "SQL error: %s\n", err);
  43.         sqlite3_free(err);
  44.     } else {
  45.         fprintf(stdout, "Operation done successfully\n");
  46.     }
  47.     return rc;
  48. }

main test

  1. int main() {
  2.     int i = 0;
  3.     const char *name = "test.db";
  4.     sqlite3 *db;
  5.     int count = 10;
  6.     Student student[count];
  8.     int r = sqlite3_open(name, &db);
  9.     if (r == 0) {
  10.         printf("open sb success\n");
  11.     }
  12. //    generateStudent(student, count);
  13. //    printf("----------==ok---------\n");
  14. //    for (i = 0; i < count; ++i) {
  15. //        printf("id:%d,name:%s,age:%d,address:%s\n", student[i].id, student[i].name, student[i].age, student[i].address);
  16. //    }
  17. //    createTable(db);
  18. //    for (i = 0; i < count; ++i) {
  19. //        insertTable(db, student[i]);
  20. //    }
  21.     if (queryTable(db, student, 2, 10) == SQLITE_OK) {
  22.         for (i = 0; i < count; ++i) {
  23.             printf("id:%d,name:%s,age:%d,address:%s\n", student[i].id, student[i].name, student[i].age,
  24.                    student[i].address);
  25.         }
  26.     }
  28.     Student stu;
  29.     stu.id = 68;
  30.     char *address = "jiangsu-xuzhou";
  31.     memcpy(stu.address, address, strlen(address));
  32.     update(db, stu);
  33.     queryTable(db, student, 0, 10);
  34.     for (i = 0; i < count; ++i) {
  35.         printf("id:%d,name:%s,age:%d,address:%s\n", student[i].id, student[i].name, student[i].age,
  36.                student[i].address);
  37.     }
  38.     update2(db, 69, address);
  39.     queryTable(db, student, 0, 10);
  40.     for (i = 0; i < count; ++i) {
  41.         printf("id:%d,name:%s,age:%d,address:%s\n", student[i].id, student[i].name, student[i].age,
  42.                student[i].address);
  43.     }
  44.     address = "jiangsu-suzhou";
  45.     stu.id = 70;
  46.     memcpy(stu.address, address, strlen(address));
  47.     update3(db, &stu);
  48.     if (queryTable(db, student, 0, 10)) {
  49.         for (i = 0; i < count; ++i) {
  50.             printf("update3-> id:%d,name:%s,age:%d,address:%s\n", student[i].id, student[i].name, student[i].age,
  51.                    student[i].address);
  52.         }
  53.     }
  54.     memset(student, 0, sizeof(student));
  55.     if (query(db, student, 0, 10) == SQLITE_OK) {
  56.         for (i = 0; i < count; ++i) {
  57.             printf("update-> id:%d,name:%s,age:%d,address:%s\n", student[i].id, student[i].name, student[i].age,
  58.                    student[i].address);
  59.         }
  60.     }
  61.     sqlite3_close(db);
  62.     return 0;
  63. }

all code

  1. //
  2. // Created by zhangrongxiang on 2018/2/23 14:10
  3. // File sql
  4. //
  6. #include <stdio.h>
  7. #include <string.h>
  8. #include <stdlib.h>
  9. #include <sqlite3.h>
  11. int queryCallback(void *stu, int argc, char **argv, char **azColName);
  13. typedef struct STUDENT {
  14.     unsigned int id;
  15.     unsigned char name[16];
  16.     unsigned int age;
  17.     unsigned char address[64];
  18. } Student;
  20. void generateStudent(Student *student, int count) {
  21. //    int count = 100;
  22. //    Student student[count];
  23.     int i = 0;
  24.     for (; i < count; i++) {
  25.         unsigned char name[16] = {0};
  26.         unsigned char address[64] = {0};
  27.         sprintf((char *) name, "zing%d", i);
  28.         sprintf((char *) address, "jiangsu-wuxi-%d", i);
  29.         student[i].id = (unsigned int) (1000 + i);
  30.         memcpy(student[i].name, name, sizeof(name));
  31.         student[i].age = (unsigned int) (10 + i);
  32.         memcpy(student[i].address, address, sizeof(address));
  33.         printf("%d-%s-%d-%s\n", student[i].id, student[i].name, student[i].age, student[i].address);
  34.     }
  35. //    printf("----------==ok---------\n");
  36. //    for (i = 0; i < count; ++i) {
  37. //        printf("id:%d,name:%s,age:%d,address:%s\n", student[i].id, student[i].name, student[i].age, student[i].address);
  38. //    }
  39. }
  41. int createTable(sqlite3 *db) {
  42.     char *result = {0};
  43.     char *sql = "CREATE TABLE IF NOT EXISTS student("\
  44.          "`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL," \
  45.          "`name`          TEXT    NOT NULL," \
  46.          "`age`            INT     NOT NULL," \
  47.          "`address`      TEXT NOT NULL);";
  48. //    *table = *sql;
  49.     int r = sqlite3_exec(db, sql, NULL, 0, &result);
  50.     if (r == SQLITE_OK) {
  51.         printf("create table success!\n");
  52.     }
  53.     return r;
  54. }
  56. int insertTable(sqlite3 *db, Student student) {
  57.     char sql[128], *result = {0};
  58.     sprintf(sql, "INSERT INTO student (`name`,`age`,`address`) VALUES('%s','%d','%s')", student.name, student.age,
  59.             student.address);
  60.     int rc = sqlite3_exec(db, sql, NULL, 0, &result);
  61.     if (rc != SQLITE_OK) {
  62.         fprintf(stderr, "SQL error: %s\n", result);
  63.         sqlite3_free(result);
  64.     } else {
  65.         printf("insert ok!\n");
  66.     }
  67.     return rc;
  68. }
  70. /*
  71.  * @param stu
  72.  * @param argc
  73.  * @param argv
  74.  * @param azColName
  75.  * @return
  76.  */
  77. int queryCallback(void *stu, int argc, char **argv, char **azColName) {
  78.     static int j;
  79.     Student *student = stu;
  80.     student[j].id = (unsigned int) atoi(argv[0]);
  81.     memcpy(student[j].name, argv[1], sizeof(student[j].name));
  82.     student[j].age = (unsigned int) atoi(argv[2]);
  83.     memcpy(student[j].address, argv[3], sizeof(student[j].address));
  84.     j++;
  85. //    printf("\n");
  86. //    for (i = 0; i < argc; i++) {
  87. //        printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
  88. //    }
  89. //    printf("argc-->%d\n",argc);
  90.     return 0;
  91. }
  93. int query(sqlite3 *db, Student *student, int index, int count) {
  94.     char sql[128];
  95.     sprintf(sql, "select * from student order by id desc limit %d,%d;", index, count);
  96.     char **err = NULL;
  97.     return sqlite3_exec(db, sql, queryCallback, student, err);
  98. }
  100. int queryTable(sqlite3 *db, Student *student, int index, int count) {
  101.     char sql[128];
  102.     if (count > 10)
  103.         count = 10;
  104.     sprintf(sql, "select * from student order by id desc limit %d,%d", index, count);
  105.     printf("%s\n", sql);
  106.     char *err = NULL;
  107.     int col, row, i, j = 0;
  108.     char **result;
  109.     int rs = sqlite3_get_table(db, sql, &result, &row, &col, &err);
  110.     if (rs == SQLITE_OK) {
  111.         printf("row %d, col %d\n", row, col);
  112. //        id-name-age-address
  113. //        printf("%s-%s-%s-%s\n", result[0], result[1], result[2], result[3]);
  114. //        1-zing0-10-jiangsu-wuxi-0
  115. //        printf("%s-%s-%s-%s\n", result[4], result[5], result[6], result[7]);
  116. //        printf("%s-%s-%s-%s\n", result[1120], result[1121], result[1122], result[1123]);
  117. //        for (i = 0; i < (row + 1) * col; i++) {
  118. //            printf("%s\n", result[i]);
  119. //        }
  120.         for (i = 0; i < (row + 1) * col; i++) {
  121.             if (i % col == 0 && i >= col) {
  122.                 student[j].id = (unsigned int) atoi(result[i]);
  123.                 memcpy(student[j].name, result[i + 1], sizeof(student[i].name));
  124.                 student[j].age = (unsigned int) atoi(result[i + 2]);
  125.                 memcpy(student[j].address, result[i + 3], sizeof(student[i].address));
  126. //                printf("id:%d,name:%s,age:%d,address:%s\n", student[j].id, student[j].name, student[j].age, student[j].address);
  127. //                printf("id:%s,name:%s,age:%s,address:%s\n", result[i], result[i + 1], result[i + 2], result[i + 3]);
  128.                 j++;
  129.             }
  130.         }
  131.     } else {
  132.         printf("error\n");
  133.     }
  134.     return rs;
  135. }
  137. int update(sqlite3 *db, Student student) {
  139.     char sql[128];
  140.     sprintf(sql, "UPDATE student set address = '%s' where ID=%d;", student.address, student.id);
  141.     char *err = NULL;
  142.     /* Execute SQL statement */
  143.     int rc = sqlite3_exec(db, sql, NULL, (void *) 0, &err);
  144.     if (rc != SQLITE_OK) {
  145.         fprintf(stderr, "SQL error: %s\n", err);
  146.         sqlite3_free(err);
  147.     } else {
  148.         fprintf(stdout, "Operation done successfully\n");
  149.     }
  150.     return rc;
  151. }
  153. int update2(sqlite3 *db, int id, char *address) {
  155.     char sql[128];
  156.     sprintf(sql, "UPDATE student set address = '%s' where ID=%d;", address, id);
  157.     char *err = NULL;
  158.     /* Execute SQL statement */
  159.     int rc = sqlite3_exec(db, sql, NULL, (void *) 0, &err);
  160.     if (rc != SQLITE_OK) {
  161.         fprintf(stderr, "SQL error: %s\n", err);
  162.         sqlite3_free(err);
  163.     } else {
  164.         fprintf(stdout, "Operation done successfully\n");
  165.     }
  166.     return rc;
  167. }
  169. int update3(sqlite3 *db, void *data) {
  170.     Student *student = (Student *) data;
  171.     printf("-->  %d\n", student->id);
  172.     printf("-->  %s\n", student->address);
  173.     char sql[128];
  174.     sprintf(sql, "UPDATE student set address = '%s' where ID=%d;", student->address, student->id);
  175.     char *err = NULL;
  176.     /* Execute SQL statement */
  177.     int rc = sqlite3_exec(db, sql, NULL, (void *) 0, &err);
  178.     if (rc != SQLITE_OK) {
  179.         fprintf(stderr, "SQL error: %s\n", err);
  180.         sqlite3_free(err);
  181.     } else {
  182.         fprintf(stdout, "Operation done successfully\n");
  183.     }
  184.     return rc;
  185. }
  187. int main() {
  188.     int i = 0;
  189.     const char *name = "test.db";
  190.     sqlite3 *db;
  191.     int count = 10;
  192.     Student student[count];
  194.     int r = sqlite3_open(name, &db);
  195.     if (r == 0) {
  196.         printf("open sb success\n");
  197.     }
  198. //    generateStudent(student, count);
  199. //    printf("----------==ok---------\n");
  200. //    for (i = 0; i < count; ++i) {
  201. //        printf("id:%d,name:%s,age:%d,address:%s\n", student[i].id, student[i].name, student[i].age, student[i].address);
  202. //    }
  203. //    createTable(db);
  204. //    for (i = 0; i < count; ++i) {
  205. //        insertTable(db, student[i]);
  206. //    }
  207.     if (queryTable(db, student, 2, 10) == SQLITE_OK) {
  208.         for (i = 0; i < count; ++i) {
  209.             printf("id:%d,name:%s,age:%d,address:%s\n", student[i].id, student[i].name, student[i].age,
  210.                    student[i].address);
  211.         }
  212.     }
  214.     Student stu;
  215.     stu.id = 68;
  216.     char *address = "jiangsu-xuzhou";
  217.     memcpy(stu.address, address, strlen(address));
  218.     update(db, stu);
  219.     queryTable(db, student, 0, 10);
  220.     for (i = 0; i < count; ++i) {
  221.         printf("id:%d,name:%s,age:%d,address:%s\n", student[i].id, student[i].name, student[i].age,
  222.                student[i].address);
  223.     }
  224.     update2(db, 69, address);
  225.     queryTable(db, student, 0, 10);
  226.     for (i = 0; i < count; ++i) {
  227.         printf("id:%d,name:%s,age:%d,address:%s\n", student[i].id, student[i].name, student[i].age,
  228.                student[i].address);
  229.     }
  230.     address = "jiangsu-suzhou";
  231.     stu.id = 70;
  232.     memcpy(stu.address, address, strlen(address));
  233.     update3(db, &stu);
  234.     if (queryTable(db, student, 0, 10)) {
  235.         for (i = 0; i < count; ++i) {
  236.             printf("update3-> id:%d,name:%s,age:%d,address:%s\n", student[i].id, student[i].name, student[i].age,
  237.                    student[i].address);
  238.         }
  239.     }
  240.     memset(student, 0, sizeof(student));
  241.     if (query(db, student, 0, 10) == SQLITE_OK) {
  242.         for (i = 0; i < count; ++i) {
  243.             printf("update-> id:%d,name:%s,age:%d,address:%s\n", student[i].id, student[i].name, student[i].age,
  244.                    student[i].address);
  245.         }
  246.     }
  247.     sqlite3_close(db);
  248.     return 0;
  249. }

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