SQLite的使用（包括编译安装的步骤）

// 解压
tar zxvf sqlite-autoconf-3110000.tar.gz// 安装
cd sqlite-autoconf-3110000
./configure --prefix=/usr/local
make
make install

sudo apt-get install sqlite3 libsqlite3-dev

gcc dbtest.c -o dbtest –lsqlite3

gcc dbtest.c -o dbtest -lsqlite3 -L.

#include <stdio.h>
#include <stdlib.h>
#include <sqlite3.h>int main(void)
{
sqlite3 *db = NULL;
int rc;
// 打开数据库，不存在会创建一个新的
rc = sqlite3_open("my.db",&db);
if(rc) // 不为0，打开失败
{
fprintf(stderr,"Can't open database:%s\n",sqlite3_errmsg(db));
sqlite3_close(db);
exit(0);
}
else
{
printf("open db success!\n");
sqlite3_close(db);
}
return 0;
}

rc = sqlite3_exec(db, sql, 0, 0, &errorMsg);
if(errorMsg)
printf("%s\n", errorMsg);
else
printf("success!\n");

if( rc != SQLITE_OK )
{
fprintf(stderr, "SQL error: %s\n", zErrMsg);
sqlite3_free(zErrMsg);
}
else
{
fprintf(stdout, "success!\n");
}

typedef int (*sqlite3_callback)(
void*, /* Data provided in the 4th argument of sqlite3_exec() */
int, /* The number of columns in row */
char**, /* An array of strings representing fields in the row */
char** /* An array of strings representing column names */
);

static int callback(void *data, int argc, char **argv, char **ColName){
int i;
fprintf(stderr, "%s: ", (const char*)data);
for(i=0; i<argc; i++){
printf("%s = %s\n", ColName[i], argv[i] ? argv[i] : "NULL");
}
printf("\n");
return 0;
}

int sqlite3_get_table(
sqlite3 *db, /* An open database */
const char *zSql, /* SQL to be evaluated */
char ***pazResult, /* Results of the query */
int *pnRow, /* Number of result rows written here */
int *pnColumn, /* Number of result columns written here */
char **pzErrmsg /* Error msg written here */
);
// 不论数据库查询是否成功，都释放 char** 查询结果
void sqlite3_free_table(char **result);

result = sqlite3_get_table( db, “select * from table1”, &dbResult, &nRow, &nColumn, &errmsg );
if( SQLITE_OK == result ) // 查询成功
{
index = nColumn;
// dbResult 第一行数据是字段名称，从 nColumn 索引开始才是真正的数据
printf( “查到%d条记录\n”, nRow ); for( i = 0; i < nRow ; i++ )
{
printf( “第 %d 条记录\n”, i+1 );
for( j = 0 ; j < nColumn; j++ )
{
printf( “字段名:%s > 字段值:%s\n”, dbResult[j], dbResult [index] );
++index;
// dbResult 的字段值是连续的，从第0索引到第 nColumn - 1索引都是字段名称，
// 从第 nColumn 索引开始，后面都是字段值
}
printf( “--------\n” );
}
}
// 释放查询结果
sqlite3_free_table( dbResult );

char query(sqlite3 *db, const char *sql) {
printf("%s\n", sql);
char *select_str = "SELECT";
char *errorMsg;
char *str_str = strstr(sql, select_str);
if(str_str) {
printf("in it, %s\n", str_str);
int row = 0, column = 0, i = 0;
char **result;
sqlite3_get_table(db, sql, &result, &row, &column, &errorMsg);
printf("row:%d, column:%d\n", row, column);
for(; i < column * (row + 1); i++) {
printf("result[%d]=%s\n", i, result[i]);
}
}else{
sqlite3_exec(db, sql, 0, 0, &errorMsg);
}
if(errorMsg){
printf("%s\n", errorMsg);
}else{
printf("success!\n");
}
}

#define SQLITE_OK 0 /* Successful result */
/* beginning-of-error-codes */
#define SQLITE_ERROR 1 /* SQL error or missing database */
#define SQLITE_INTERNAL 2 /* Internal logic error in SQLite */
#define SQLITE_PERM 3 /* Access permission denied */
#define SQLITE_ABORT 4 /* Callback routine requested an abort */
#define SQLITE_BUSY 5 /* The database file is locked */
#define SQLITE_LOCKED 6 /* A table in the database is locked */
#define SQLITE_NOMEM 7 /* A malloc() failed */
#define SQLITE_READONLY 8 /* Attempt to write a readonly database */
#define SQLITE_INTERRUPT 9 /* Operation terminated by sqlite3_interrupt()*/
#define SQLITE_IOERR 10 /* Some kind of disk I/O error occurred */
#define SQLITE_CORRUPT 11 /* The database disk image is malformed */
#define SQLITE_NOTFOUND 12 /* Unknown opcode in sqlite3_file_control() */
#define SQLITE_FULL 13 /* Insertion failed because database is full */
#define SQLITE_CANTOPEN 14 /* Unable to open the database file */
#define SQLITE_PROTOCOL 15 /* Database lock protocol error */
#define SQLITE_EMPTY 16 /* Database is empty */
#define SQLITE_SCHEMA 17 /* The database schema changed */
#define SQLITE_TOOBIG 18 /* String or BLOB exceeds size limit */
#define SQLITE_CONSTRAINT 19 /* Abort due to constraint violation */
#define SQLITE_MISMATCH 20 /* Data type mismatch */
#define SQLITE_MISUSE 21 /* Library used incorrectly */
#define SQLITE_NOLFS 22 /* Uses OS features not supported on host */
#define SQLITE_AUTH 23 /* Authorization denied */
#define SQLITE_FORMAT 24 /* Auxiliary database format error */
#define SQLITE_RANGE 25 /* 2nd parameter to sqlite3_bind out of range */
#define SQLITE_NOTADB 26 /* File opened that is not a database file */
#define SQLITE_NOTICE 27 /* Notifications from sqlite3_log() */
#define SQLITE_WARNING 28 /* Warnings from sqlite3_log() */
#define SQLITE_ROW 100 /* sqlite3_step() has another row ready */
#define SQLITE_DONE 101 /* sqlite3_step() has finished executing */
/* end-of-error-codes */