ant-http/libs/dbhelper.c

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5.3 KiB
C
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2015-10-22 11:39:11 +02:00
#include "dbhelper.h"
sqlite3 * database(const char* file)
{
sqlite3* db;
int rc = sqlite3_open(file,&db);
if (rc != SQLITE_OK) {
LOG( "Cannot open database: %s %s\n",file, sqlite3_errmsg(db));
sqlite3_close(db);
return NULL;
}
return db;
}
void dbclose(sqlite3* db)
{
sqlite3_close(db);
}
int dbquery(sqlite3* db,const char* sql, int (*call_back)())
{
char *err_msg = 0;
sqlite3_mutex_enter(sqlite3_db_mutex(db));
int rc = sqlite3_exec(db,sql,call_back,0,&err_msg);
sqlite3_mutex_leave(sqlite3_db_mutex(db));
if(rc != SQLITE_OK)
{
LOG("Cannot query : '%s' [%s]\n", sql,err_msg);
sqlite3_free(err_msg);
return 0;
}
return 1;
}
dbfield __field()
{
dbfield ret = malloc(sizeof *ret);
ret->name = NULL;
ret->value = NULL;
ret->next = NULL;
return ret;
}
dbrecord __record()
{
dbrecord ret = malloc(sizeof *ret);
ret->fields = NULL;
ret->idx = 0;
ret->next = NULL;
return ret;
}
char* __name_list(const dbfield f)
{
char* sql = f->name;
for(dbfield p=f->next;p!=NULL;p=p->next)
{
sql = __s("%s,%s",sql,p->name);
}
return sql;
}
char* __value_list(const dbfield f)
{
char* sql = __s("'%s'",f->value);
for(dbfield p=f->next;p!=NULL;p=p->next)
{
sql = __s("%s,'%s'",sql,p->value);
}
return sql;
}
char* __name_value_list(const dbfield f)
{
char* sql = __s("%s='%s'", f->name,f->value);
for(dbfield p=f->next;p!=NULL;p=p->next)
{
sql = __s("%s,%s='%s'",sql, p->name,f->value);
}
return sql;
}
void add_record(dbrecord* r,dbfield f)
{
dbrecord new_r = malloc(sizeof *new_r);
new_r->fields = f;
new_r->idx = 1;
new_r->next = NULL;
if((*r)->idx == 0)
*r = new_r;
else
{
dbrecord* temp;
for(temp = r;(*temp)->next!=NULL;temp=&((*temp)->next))
{
(*temp)->idx++;
}
(*temp)->next = new_r;
}
//new_r->next = *r;
//*r = new_r;
}
void add_field(dbfield* field,const char* name, const char* value)
{
dbfield new_field = malloc(sizeof *new_field);
new_field->name = strdup(name);
new_field->value = strdup(value);
new_field->next = *field;
*field = new_field;
}
char* value_of(const dbfield f,const char* key)
{
for(dbfield t = f; t != NULL; t=t->next)
if(strcmp(t->name,key)==0)
return t->value;
return NULL;
}
int dbinsert(sqlite3* db,const char* table, const dbfield fields)
{
char* sqlprefix = "INSERT INTO %s (%s) VALUES (%s)";
char* name_list = __name_list(fields);
char* value_list = __value_list(fields);
char* sql = __s(sqlprefix,table,name_list,value_list);
int ret = dbquery(db,sql,NULL);
free(name_list);
free(value_list);
free(sql);
if(ret == 0)
return -1;
return sqlite3_last_insert_rowid(db);
}
dbrecord dball(sqlite3* db,const char* table)
{
return dbselect(db,table,"1=%d",1);
}
dbrecord dbselect(sqlite3* db, const char* table,const char* fstring,...)
{
char* sql;
char* prefix = "SELECT * FROM %s WHERE (%s)";
char* cond;
va_list arguments;
int dlen;
sqlite3_stmt *statement;
dbrecord records = __record();
va_start( arguments, fstring);
dlen = vsnprintf(0,0,fstring,arguments) + 1;
va_end(arguments);
cond = (char*) malloc(dlen*sizeof(char));
va_start(arguments, fstring);
vsnprintf(cond, dlen, fstring, arguments);
va_end(arguments);
sql = __s(prefix,table,cond);
if(sqlite3_prepare_v2(db, sql, -1, &statement, 0) == SQLITE_OK)
{
int cols = sqlite3_column_count(statement);
int result = 0;
while((result = sqlite3_step(statement)) == SQLITE_ROW)
{
dbfield fields = __field();
for(int col = 0; col < cols; col++)
{
char *value = (char*)sqlite3_column_text(statement, col);
char *name = (char*)sqlite3_column_name(statement, col);
add_field(&fields,name,(value!=0)?value:"");
}
add_record(&records,fields);
}
sqlite3_finalize(statement);
}
else
{
LOG("Can not select:%s [%s]\n",sql,sqlite3_errmsg(db));
}
free(cond);
free(sql);
return records;
}
int hastable(sqlite3* db,const char* table)
{
2016-10-30 16:14:04 +01:00
char * prefix = __s("type='table' and name='%s'",table);
dbrecord rc = dbselect(db,"sqlite_master",prefix);
free(prefix);
if(!rc) return 0;
if(!rc->fields) return 0;
free(rc);
return 1;
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}
int dbupdate(sqlite3* db,const char* table,const dbfield field,const char* fstring,...)
{
char* sql;
char* prefix = "UPDATE %s SET %s WHERE (%s)";
char* cond;
char* list;
va_list arguments;
int dlen;
va_start( arguments, fstring);
dlen = vsnprintf(0,0,fstring,arguments) + 1;
va_end(arguments);
cond = (char*) malloc(dlen*sizeof(char));
va_start(arguments, fstring);
vsnprintf(cond, dlen, fstring, arguments);
va_end(arguments);
list = __name_value_list(field);
sql = __s(prefix,table,list,cond);
int ret = dbquery(db,sql,NULL);
free(cond);
free(list);
free(sql);
return ret;
}
int dbdelete(sqlite3* db,const char* table,const char* fstring,...)
{
char* sql;
char* prefix = "DELETE FROM %s WHERE (%s)";
char* cond;
va_list arguments;
int dlen;
va_start( arguments, fstring);
dlen = vsnprintf(0,0,fstring,arguments) + 1;
va_end(arguments);
cond = (char*) malloc(dlen*sizeof(char));
va_start(arguments, fstring);
vsnprintf(cond, dlen, fstring, arguments);
va_end(arguments);
sql = __s(prefix,table,cond);
int ret = dbquery(db,sql,NULL);
free(cond);
free(sql);
return ret;
}