C 扩展库 - sqlite3 API CRUD
CRUD
struct student
typedef struct STUDENT {
unsigned int id;
unsigned char name[16];
unsigned int age;
unsigned char address[64];
} Student;
create table
CREATE TABLE IF NOT EXISTS student(
`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
`name` TEXT NOT NULL,
`age` INT NOT NULL,
`address` TEXT NOT NULL
)
int createTable(sqlite3 *db) {
char *result = {0};
char *sql = "CREATE TABLE IF NOT EXISTS student("\
"`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL," \
"`name` TEXT NOT NULL," \
"`age` INT NOT NULL," \
"`address` TEXT NOT NULL);";
int r = sqlite3_exec(db, sql, NULL, 0, &result);
if (r == SQLITE_OK) {
printf("create table success!\n");
}
return r;
}
generate student data
void generateStudent(Student *student, int count) {
// int count = 100;
// Student student[count];
int i = 0;
for (; i < count; i++) {
unsigned char name[16] = {0};
unsigned char address[64] = {0};
sprintf((char *) name, "zing%d", i);
sprintf((char *) address, "jiangsu-wuxi-%d", i);
student[i].id = (unsigned int) (1000 + i);
memcpy(student[i].name, name, sizeof(name));
student[i].age = (unsigned int) (10 + i);
memcpy(student[i].address, address, sizeof(address));
printf("%d-%s-%d-%s\n", student[i].id, student[i].name, student[i].age, student[i].address);
}
// printf("----------==ok---------\n");
// for (i = 0; i < count; ++i) {
// printf("id:%d,name:%s,age:%d,address:%s\n", student[i].id, student[i].name, student[i].age, student[i].address);
// }
}
insert table
int insertTable(sqlite3 *db, Student student) {
char sql[128], *result = {0};
sprintf(sql, "INSERT INTO student (`name`,`age`,`address`) VALUES('%s','%d','%s')", student.name, student.age,
student.address);
int rc = sqlite3_exec(db, sql, NULL, 0, &result);
if (rc != SQLITE_OK) {
fprintf(stderr, "SQL error: %s\n", result);
sqlite3_free(result);
} else {
printf("insert ok!\n");
}
return rc;
}
query table 1
int queryTable(sqlite3 *db, Student *student, int index, int count) {
char sql[128];
if (count > 10)
count = 10;
sprintf(sql, "select * from student order by id desc limit %d,%d", index, count);
printf("%s\n", sql);
char *err = NULL;
int col, row, i, j = 0;
char **result;
int rs = sqlite3_get_table(db, sql, &result, &row, &col, &err);
if (rs == SQLITE_OK) {
printf("row %d, col %d\n", row, col);
// id-name-age-address
// printf("%s-%s-%s-%s\n", result[0], result[1], result[2], result[3]);
// 1-zing0-10-jiangsu-wuxi-0
// printf("%s-%s-%s-%s\n", result[4], result[5], result[6], result[7]);
// printf("%s-%s-%s-%s\n", result[1120], result[1121], result[1122], result[1123]);
// for (i = 0; i < (row + 1) * col; i++) {
// printf("%s\n", result[i]);
// }
for (i = 0; i < (row + 1) * col; i++) {
if (i % col == 0 && i >= col) {
student[j].id = (unsigned int) atoi(result[i]);
memcpy(student[j].name, result[i + 1], sizeof(student[i].name));
student[j].age = (unsigned int) atoi(result[i + 2]);
memcpy(student[j].address, result[i + 3], sizeof(student[i].address));
// printf("id:%d,name:%s,age:%d,address:%s\n", student[j].id, student[j].name, student[j].age, student[j].address);
// printf("id:%s,name:%s,age:%s,address:%s\n", result[i], result[i + 1], result[i + 2], result[i + 3]);
j++;
}
}
} else {
printf("error\n");
}
return rs;
}
query table 2
/*
* @param stu
* @param argc
* @param argv
* @param azColName
* @return
*/
int queryCallback(void *stu, int argc, char **argv, char **azColName) {
static int j;
Student *student = stu;
student[j].id = (unsigned int) atoi(argv[0]);
memcpy(student[j].name, argv[1], sizeof(student[j].name));
student[j].age = (unsigned int) atoi(argv[2]);
memcpy(student[j].address, argv[3], sizeof(student[j].address));
j++;
// printf("\n");
// for (i = 0; i < argc; i++) {
// printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
// }
// printf("argc-->%d\n",argc);
return 0;
}
int query(sqlite3 *db, Student *student, int index, int count) {
char sql[128];
sprintf(sql, "select * from student order by id desc limit %d,%d;", index, count);
char **err = NULL;
return sqlite3_exec(db, sql, queryCallback, student, err);
}
update table
int update(sqlite3 *db, Student student) {
char sql[128];
sprintf(sql, "UPDATE student set address = '%s' where ID=%d;", student.address, student.id);
char *err = NULL;
/* Execute SQL statement */
int rc = sqlite3_exec(db, sql, NULL, (void *) 0, &err);
if (rc != SQLITE_OK) {
fprintf(stderr, "SQL error: %s\n", err);
sqlite3_free(err);
} else {
fprintf(stdout, "Operation done successfully\n");
}
return rc;
}
int update2(sqlite3 *db, int id, char *address) {
char sql[128];
sprintf(sql, "UPDATE student set address = '%s' where ID=%d;", address, id);
char *err = NULL;
/* Execute SQL statement */
int rc = sqlite3_exec(db, sql, NULL, (void *) 0, &err);
if (rc != SQLITE_OK) {
fprintf(stderr, "SQL error: %s\n", err);
sqlite3_free(err);
} else {
fprintf(stdout, "Operation done successfully\n");
}
return rc;
}
int update3(sqlite3 *db, void *data) {
Student *student = (Student *) data;
printf("--> %d\n", student->id);
printf("--> %s\n", student->address);
char sql[128];
sprintf(sql, "UPDATE student set address = '%s' where ID=%d;", student->address, student->id);
char *err = NULL;
/* Execute SQL statement */
int rc = sqlite3_exec(db, sql, NULL, (void *) 0, &err);
if (rc != SQLITE_OK) {
fprintf(stderr, "SQL error: %s\n", err);
sqlite3_free(err);
} else {
fprintf(stdout, "Operation done successfully\n");
}
return rc;
}
main test
int main() {
int i = 0;
const char *name = "test.db";
sqlite3 *db;
int count = 10;
Student student[count];
int r = sqlite3_open(name, &db);
if (r == 0) {
printf("open sb success\n");
}
// generateStudent(student, count);
// printf("----------==ok---------\n");
// for (i = 0; i < count; ++i) {
// printf("id:%d,name:%s,age:%d,address:%s\n", student[i].id, student[i].name, student[i].age, student[i].address);
// }
// createTable(db);
// for (i = 0; i < count; ++i) {
// insertTable(db, student[i]);
// }
if (queryTable(db, student, 2, 10) == SQLITE_OK) {
for (i = 0; i < count; ++i) {
printf("id:%d,name:%s,age:%d,address:%s\n", student[i].id, student[i].name, student[i].age,
student[i].address);
}
}
Student stu;
stu.id = 68;
char *address = "jiangsu-xuzhou";
memcpy(stu.address, address, strlen(address));
update(db, stu);
queryTable(db, student, 0, 10);
for (i = 0; i < count; ++i) {
printf("id:%d,name:%s,age:%d,address:%s\n", student[i].id, student[i].name, student[i].age,
student[i].address);
}
update2(db, 69, address);
queryTable(db, student, 0, 10);
for (i = 0; i < count; ++i) {
printf("id:%d,name:%s,age:%d,address:%s\n", student[i].id, student[i].name, student[i].age,
student[i].address);
}
address = "jiangsu-suzhou";
stu.id = 70;
memcpy(stu.address, address, strlen(address));
update3(db, &stu);
if (queryTable(db, student, 0, 10)) {
for (i = 0; i < count; ++i) {
printf("update3-> id:%d,name:%s,age:%d,address:%s\n", student[i].id, student[i].name, student[i].age,
student[i].address);
}
}
memset(student, 0, sizeof(student));
if (query(db, student, 0, 10) == SQLITE_OK) {
for (i = 0; i < count; ++i) {
printf("update-> id:%d,name:%s,age:%d,address:%s\n", student[i].id, student[i].name, student[i].age,
student[i].address);
}
}
sqlite3_close(db);
return 0;
}
all code
//
// Created by zhangrongxiang on 2018/2/23 14:10
// File sql
//
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sqlite3.h>
int queryCallback(void *stu, int argc, char **argv, char **azColName);
typedef struct STUDENT {
unsigned int id;
unsigned char name[16];
unsigned int age;
unsigned char address[64];
} Student;
void generateStudent(Student *student, int count) {
// int count = 100;
// Student student[count];
int i = 0;
for (; i < count; i++) {
unsigned char name[16] = {0};
unsigned char address[64] = {0};
sprintf((char *) name, "zing%d", i);
sprintf((char *) address, "jiangsu-wuxi-%d", i);
student[i].id = (unsigned int) (1000 + i);
memcpy(student[i].name, name, sizeof(name));
student[i].age = (unsigned int) (10 + i);
memcpy(student[i].address, address, sizeof(address));
printf("%d-%s-%d-%s\n", student[i].id, student[i].name, student[i].age, student[i].address);
}
// printf("----------==ok---------\n");
// for (i = 0; i < count; ++i) {
// printf("id:%d,name:%s,age:%d,address:%s\n", student[i].id, student[i].name, student[i].age, student[i].address);
// }
}
int createTable(sqlite3 *db) {
char *result = {0};
char *sql = "CREATE TABLE IF NOT EXISTS student("\
"`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL," \
"`name` TEXT NOT NULL," \
"`age` INT NOT NULL," \
"`address` TEXT NOT NULL);";
// *table = *sql;
int r = sqlite3_exec(db, sql, NULL, 0, &result);
if (r == SQLITE_OK) {
printf("create table success!\n");
}
return r;
}
int insertTable(sqlite3 *db, Student student) {
char sql[128], *result = {0};
sprintf(sql, "INSERT INTO student (`name`,`age`,`address`) VALUES('%s','%d','%s')", student.name, student.age,
student.address);
int rc = sqlite3_exec(db, sql, NULL, 0, &result);
if (rc != SQLITE_OK) {
fprintf(stderr, "SQL error: %s\n", result);
sqlite3_free(result);
} else {
printf("insert ok!\n");
}
return rc;
}
/*
* @param stu
* @param argc
* @param argv
* @param azColName
* @return
*/
int queryCallback(void *stu, int argc, char **argv, char **azColName) {
static int j;
Student *student = stu;
student[j].id = (unsigned int) atoi(argv[0]);
memcpy(student[j].name, argv[1], sizeof(student[j].name));
student[j].age = (unsigned int) atoi(argv[2]);
memcpy(student[j].address, argv[3], sizeof(student[j].address));
j++;
// printf("\n");
// for (i = 0; i < argc; i++) {
// printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
// }
// printf("argc-->%d\n",argc);
return 0;
}
int query(sqlite3 *db, Student *student, int index, int count) {
char sql[128];
sprintf(sql, "select * from student order by id desc limit %d,%d;", index, count);
char **err = NULL;
return sqlite3_exec(db, sql, queryCallback, student, err);
}
int queryTable(sqlite3 *db, Student *student, int index, int count) {
char sql[128];
if (count > 10)
count = 10;
sprintf(sql, "select * from student order by id desc limit %d,%d", index, count);
printf("%s\n", sql);
char *err = NULL;
int col, row, i, j = 0;
char **result;
int rs = sqlite3_get_table(db, sql, &result, &row, &col, &err);
if (rs == SQLITE_OK) {
printf("row %d, col %d\n", row, col);
// id-name-age-address
// printf("%s-%s-%s-%s\n", result[0], result[1], result[2], result[3]);
// 1-zing0-10-jiangsu-wuxi-0
// printf("%s-%s-%s-%s\n", result[4], result[5], result[6], result[7]);
// printf("%s-%s-%s-%s\n", result[1120], result[1121], result[1122], result[1123]);
// for (i = 0; i < (row + 1) * col; i++) {
// printf("%s\n", result[i]);
// }
for (i = 0; i < (row + 1) * col; i++) {
if (i % col == 0 && i >= col) {
student[j].id = (unsigned int) atoi(result[i]);
memcpy(student[j].name, result[i + 1], sizeof(student[i].name));
student[j].age = (unsigned int) atoi(result[i + 2]);
memcpy(student[j].address, result[i + 3], sizeof(student[i].address));
// printf("id:%d,name:%s,age:%d,address:%s\n", student[j].id, student[j].name, student[j].age, student[j].address);
// printf("id:%s,name:%s,age:%s,address:%s\n", result[i], result[i + 1], result[i + 2], result[i + 3]);
j++;
}
}
} else {
printf("error\n");
}
return rs;
}
int update(sqlite3 *db, Student student) {
char sql[128];
sprintf(sql, "UPDATE student set address = '%s' where ID=%d;", student.address, student.id);
char *err = NULL;
/* Execute SQL statement */
int rc = sqlite3_exec(db, sql, NULL, (void *) 0, &err);
if (rc != SQLITE_OK) {
fprintf(stderr, "SQL error: %s\n", err);
sqlite3_free(err);
} else {
fprintf(stdout, "Operation done successfully\n");
}
return rc;
}
int update2(sqlite3 *db, int id, char *address) {
char sql[128];
sprintf(sql, "UPDATE student set address = '%s' where ID=%d;", address, id);
char *err = NULL;
/* Execute SQL statement */
int rc = sqlite3_exec(db, sql, NULL, (void *) 0, &err);
if (rc != SQLITE_OK) {
fprintf(stderr, "SQL error: %s\n", err);
sqlite3_free(err);
} else {
fprintf(stdout, "Operation done successfully\n");
}
return rc;
}
int update3(sqlite3 *db, void *data) {
Student *student = (Student *) data;
printf("--> %d\n", student->id);
printf("--> %s\n", student->address);
char sql[128];
sprintf(sql, "UPDATE student set address = '%s' where ID=%d;", student->address, student->id);
char *err = NULL;
/* Execute SQL statement */
int rc = sqlite3_exec(db, sql, NULL, (void *) 0, &err);
if (rc != SQLITE_OK) {
fprintf(stderr, "SQL error: %s\n", err);
sqlite3_free(err);
} else {
fprintf(stdout, "Operation done successfully\n");
}
return rc;
}
int main() {
int i = 0;
const char *name = "test.db";
sqlite3 *db;
int count = 10;
Student student[count];
int r = sqlite3_open(name, &db);
if (r == 0) {
printf("open sb success\n");
}
// generateStudent(student, count);
// printf("----------==ok---------\n");
// for (i = 0; i < count; ++i) {
// printf("id:%d,name:%s,age:%d,address:%s\n", student[i].id, student[i].name, student[i].age, student[i].address);
// }
// createTable(db);
// for (i = 0; i < count; ++i) {
// insertTable(db, student[i]);
// }
if (queryTable(db, student, 2, 10) == SQLITE_OK) {
for (i = 0; i < count; ++i) {
printf("id:%d,name:%s,age:%d,address:%s\n", student[i].id, student[i].name, student[i].age,
student[i].address);
}
}
Student stu;
stu.id = 68;
char *address = "jiangsu-xuzhou";
memcpy(stu.address, address, strlen(address));
update(db, stu);
queryTable(db, student, 0, 10);
for (i = 0; i < count; ++i) {
printf("id:%d,name:%s,age:%d,address:%s\n", student[i].id, student[i].name, student[i].age,
student[i].address);
}
update2(db, 69, address);
queryTable(db, student, 0, 10);
for (i = 0; i < count; ++i) {
printf("id:%d,name:%s,age:%d,address:%s\n", student[i].id, student[i].name, student[i].age,
student[i].address);
}
address = "jiangsu-suzhou";
stu.id = 70;
memcpy(stu.address, address, strlen(address));
update3(db, &stu);
if (queryTable(db, student, 0, 10)) {
for (i = 0; i < count; ++i) {
printf("update3-> id:%d,name:%s,age:%d,address:%s\n", student[i].id, student[i].name, student[i].age,
student[i].address);
}
}
memset(student, 0, sizeof(student));
if (query(db, student, 0, 10) == SQLITE_OK) {
for (i = 0; i < count; ++i) {
printf("update-> id:%d,name:%s,age:%d,address:%s\n", student[i].id, student[i].name, student[i].age,
student[i].address);
}
}
sqlite3_close(db);
return 0;
}
See
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