C语言操作sqlite3

C语言编程测试sqlite3

编程环境搭建

运行C程序，需要先下载SQLite的源码：https://www.sqlite.org/download.html

我下载的是sqlite-amalgamation-3370000.zip

解压后是两个c文件和两个h文件：

注意，sqlite的源码全部被合并成在一个 sqlite3.c 文件，代码量非常大，目前已有23万多行代码（如下图），如果不需要修改源码就不用打开该文件因为打开后可能会让你的电脑卡住一会儿。

sqlite3.c添加到工程项目中，并添加头文件的包含路径：

我自己的测试代码如下：

#include <stdio.h>
#include <stdlib.h>
#include <sqlite3.h> 


static int sql_exec_callback(void *NotUsed, int argc, char **argv, char **azColName) {
	int i;
	for (i = 0; i < argc; i++) {
		printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
	}
	printf("\n");
	return 0;
}


int main(int argc, char* argv[])
{
	sqlite3 *db;
	char *zErrMsg = 0;
	int  rc;
	char *sql;

	/* Open database */
	rc = sqlite3_open("test.db", &db);
	if (rc) {
		fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
		exit(0);
	}
	else {
		fprintf(stdout, "Opened database successfully\n");
	}

	/* Create SQL statement */
	sql = (char*)"CREATE TABLE COMPANY("  \
		"ID INT PRIMARY KEY     NOT NULL," \
		"NAME           TEXT    NOT NULL," \
		"AGE            INT     NOT NULL," \
		"ADDRESS        CHAR(50)," \
		"SALARY         REAL );";

	/* Execute SQL statement */
	rc = sqlite3_exec(db, sql, sql_exec_callback, 0, &zErrMsg);
	if (rc != SQLITE_OK) {
		fprintf(stderr, "SQL error: %s\n", zErrMsg);
		sqlite3_free(zErrMsg);
	}
	else {
		fprintf(stdout, "Table created successfully\n");
	}

	/* Create SQL statement */
	sql = (char*) "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) "  \
		"VALUES (1, 'Paul', 32, 'California', 20000.00 ); " \
		"INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) "  \
		"VALUES (2, 'Allen', 25, 'Texas', 15000.00 ); "     \
		"INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY)" \
		"VALUES (3, 'Teddy', 23, 'Norway', 20000.00 );" \
		"INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY)" \
		"VALUES (4, 'Mark', 25, 'Rich-Mond ', 65000.00 );";

	/* Execute SQL statement */
	rc = sqlite3_exec(db, sql, sql_exec_callback, 0, &zErrMsg);
	if (rc != SQLITE_OK) {
		fprintf(stderr, "SQL error: %s\n", zErrMsg);
		sqlite3_free(zErrMsg);
	}
	else {
		fprintf(stdout, "Records created successfully\n");
	}
	/* Create SQL statement */
	sql =(char*) "SELECT * from COMPANY";

	const char* data = "Callback function called";
	/* Execute SQL statement */
	rc = sqlite3_exec(db, sql, sql_exec_callback, (void*)data, &zErrMsg);
	if (rc != SQLITE_OK) {
		fprintf(stderr, "SQL error: %s\n", zErrMsg);
		sqlite3_free(zErrMsg);
	}
	else {
		fprintf(stdout, "Operation done successfully\n");
	}
	sqlite3_close(db);
	return 0;
}

代码执行效果：

Opened database successfully
Table created successfully
Records created successfully
ID = 1                                                                                                                  Records created successfully
ID = 1
NAME = Paul
AGE = 32
ADDRESS = California
SALARY = 20000.0

ID = 2
NAME = Allen
AGE = 25
ADDRESS = Texas
SALARY = 15000.0

ID = 3
NAME = Teddy
AGE = 23
ADDRESS = Norway
SALARY = 20000.0

ID = 4
NAME = Mark
AGE = 25
ADDRESS = Rich-Mond
SALARY = 65000.0

Operation done successfully