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vlc/modules/misc/sqlite.c

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/*****************************************************************************
* sqlite.c: An SQLite3 wrapper for VLC
*****************************************************************************
* Copyright (C) 2008-2009 the VideoLAN team
* $Id$
*
* Authors: Antoine Lejeune <phytos@videolan.org>
* Jean-Philippe André <jpeg@videolan.org>
* Rémi Duraffort <ivoire@videolan.org>
* Adrien Maglo <magsoft@videolan.org>
* Srikanth Raju <srikiraju@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <vlc_common.h>
#include <vlc_sql.h>
#include <vlc_plugin.h>
#include <sqlite3.h>
#include <assert.h>
/*****************************************************************************
* Private structures
*****************************************************************************/
struct sql_sys_t
{
sqlite3 *db; /**< Database connection. */
vlc_mutex_t lock; /**< SQLite mutex. Threads are evil here. */
vlc_mutex_t trans_lock; /**< Mutex for running transactions */
};
struct sql_stmt_t
{
sqlite3_stmt* p_sqlitestmt;
};
/*****************************************************************************
* Headers
*****************************************************************************/
static int load ( vlc_object_t * );
static void unload ( vlc_object_t * );
static int OpenDatabase( sql_t * );
static int CloseDatabase (sql_t * );
static int QueryCallback( sql_t * p_sql,
const char * query,
sql_query_callback_t callback,
void *arg ); // 1st argument to callback
static int Query( sql_t * p_sql,
const char * query,
char *** result,
int * nrow,
int * ncol );
static int GetTables( sql_t * p_sql,
char *** result );
static void FreeResult( sql_t * p_sql,
char **pp_result );
static char* VMSprintf( const char* psz_fmt,
va_list args );
static int BeginTransaction( sql_t* p_sql );
static int CommitTransaction( sql_t* p_sql );
static void RollbackTransaction( sql_t* p_sql );
static sql_stmt_t* PrepareStatement( sql_t* p_sql,
const char* psz_fmt,
int i_length );
static int BindValues( sql_t* p_sql,
sql_stmt_t* p_stmt,
int i_pos,
unsigned int i_type,
const sql_value_t* p_value );
static int StatementStep( sql_t* p_sql,
sql_stmt_t* p_stmt );
static int StatementReset( sql_t* p_sql,
sql_stmt_t* p_stmt );
static int StatementFinalize( sql_t* p_sql,
sql_stmt_t* p_stmt );
static int GetColumnFromStatement( sql_t* p_sql,
sql_stmt_t* p_stmt,
int i_col,
int type,
sql_value_t *p_res );
static int GetColumnTypeFromStatement( sql_t* p_sql,
sql_stmt_t* p_stmt,
int i_col,
int* pi_type );
static int GetColumnSize( sql_t* p_sql,
sql_stmt_t* p_stmt,
int i_col );
/*****************************************************************************
* Module description
*****************************************************************************/
vlc_module_begin()
set_shortname( "SQLite" )
set_description( _("SQLite database module") )
set_capability( "sql", 1 )
set_callbacks( load, unload )
set_category( CAT_ADVANCED )
vlc_module_end()
/**
* @brief Load module
* @param obj Parent object
* @return VLC_SUCCESS or VLC_ENOMEM
*/
static int load( vlc_object_t *p_this )
{
sql_t *p_sql = (sql_t *) p_this;
/* Initialize sys_t */
p_sql->p_sys = calloc( 1, sizeof( *p_sql->p_sys ) );
if( !p_sql->p_sys )
return VLC_ENOMEM;
vlc_mutex_init( &p_sql->p_sys->lock );
vlc_mutex_init( &p_sql->p_sys->trans_lock );
/* Open Database */
if( OpenDatabase( p_sql ) == VLC_SUCCESS )
msg_Dbg( p_sql, "sqlite module loaded" );
else
{
free( p_sql->p_sys );
vlc_mutex_destroy( &p_sql->p_sys->lock );
vlc_mutex_destroy( &p_sql->p_sys->trans_lock );
return VLC_EGENERIC;
}
p_sql->pf_query_callback = QueryCallback;
p_sql->pf_get_tables = GetTables;
p_sql->pf_query = Query;
p_sql->pf_free = FreeResult;
p_sql->pf_vmprintf = VMSprintf;
p_sql->pf_begin = BeginTransaction;
p_sql->pf_commit = CommitTransaction;
p_sql->pf_rollback = RollbackTransaction;
p_sql->pf_prepare = PrepareStatement;
p_sql->pf_bind = BindValues;
p_sql->pf_run = StatementStep;
p_sql->pf_reset = StatementReset;
p_sql->pf_finalize = StatementFinalize;
p_sql->pf_gettype = GetColumnTypeFromStatement;
p_sql->pf_getcolumn = GetColumnFromStatement;
p_sql->pf_getcolumnsize = GetColumnSize;
return VLC_SUCCESS;
}
/**
* @brief Unload module
* @param obj This sql_t object
* @return Nothing
*/
static void unload( vlc_object_t *p_this )
{
sql_t *p_sql = (sql_t *)p_this;
CloseDatabase( p_sql );
vlc_mutex_destroy( &p_sql->p_sys->lock );
vlc_mutex_destroy( &p_sql->p_sys->trans_lock );
free( p_sql->p_sys );
}
/**
* @brief Sqlite Busy handler
* @param p_data sql_t object
* @param i_times Number of times busy handler has been invoked
*/
static int vlc_sqlite_busy_handler( void* p_data, int i_times )
{
if( i_times >= 10 )
{
msg_Warn( (sql_t*) p_data, "Wait limit exceeded in SQLITE_BUSY handler" );
return 0;
}
msleep( 2000000 );
return 1;
}
/**
* @brief Open current database
* @param p_sql This sql_t object
* @return VLC_SUCCESS or VLC_EGENERIC
* @note p_sql->psz_host is required
*/
static int OpenDatabase( sql_t *p_sql )
{
assert( p_sql->psz_host && *p_sql->psz_host );
if( sqlite3_threadsafe() == 0 )
{
msg_Err( p_sql, "Sqlite library on your system is not threadsafe" );
return VLC_EGENERIC;
}
if( sqlite3_open( p_sql->psz_host, &p_sql->p_sys->db ) != SQLITE_OK )
{
msg_Err( p_sql, "Can't open database : %s", p_sql->psz_host );
msg_Err( p_sql, "sqlite3 error: %d: %s",
sqlite3_errcode( p_sql->p_sys->db ),
sqlite3_errmsg( p_sql->p_sys->db ) );
return VLC_EGENERIC;
}
if( sqlite3_busy_timeout( p_sql->p_sys->db, 30000 ) != SQLITE_OK )
{
msg_Err( p_sql, "sqlite3 error: %d: %s",
sqlite3_errcode( p_sql->p_sys->db ),
sqlite3_errmsg( p_sql->p_sys->db ) );
return VLC_EGENERIC;
}
if( sqlite3_busy_handler( p_sql->p_sys->db, vlc_sqlite_busy_handler, p_sql )
!= SQLITE_OK )
{
msg_Err( p_sql, "sqlite3 error: %d: %s",
sqlite3_errcode( p_sql->p_sys->db ),
sqlite3_errmsg( p_sql->p_sys->db ) );
return VLC_EGENERIC;
}
return VLC_SUCCESS;
}
/**
* @brief Close current database
* @param p_sql This sql_t object
* @return VLC_SUCCESS
* You have to set and open current database first
*/
static int CloseDatabase( sql_t *p_sql )
{
assert( p_sql->p_sys->db );
/* Close all prepared statements */
sqlite3_stmt* p_stmt;
while( ( p_stmt = sqlite3_next_stmt( p_sql->p_sys->db, NULL ) ) != NULL )
{
if( sqlite3_finalize( p_stmt ) != SQLITE_OK )
{
msg_Warn( p_sql, "sqlite3 error: %d: %s",
sqlite3_errcode( p_sql->p_sys->db ),
sqlite3_errmsg( p_sql->p_sys->db ) );
}
}
/* Close database */
/* TODO: We've closed all open prepared statements
* Perhaps sqlite3_close can still fail? */
sqlite3_close( p_sql->p_sys->db );
p_sql->p_sys->db = NULL;
return VLC_SUCCESS;
}
/**
* @brief SQL Query with callback
* @param p_sql This sql_t object
* @param query SQL query
* @param callback Callback function to receive results row by row
* @param arg Argument to pass to callback
* @return VLC_SUCCESS or an error code
* You have to set and open current database first
*/
static int QueryCallback( sql_t * p_sql,
const char * query,
sql_query_callback_t callback,
void *arg )
{
int i_ret = VLC_SUCCESS;
vlc_mutex_lock( &p_sql->p_sys->lock );
assert( p_sql->p_sys->db );
#ifndef NDEBUG
msg_Dbg( p_sql, "QueryCallback: %s", query );
#endif
sqlite3_exec( p_sql->p_sys->db, query, callback, arg, NULL );
if( sqlite3_errcode( p_sql->p_sys->db ) != SQLITE_OK )
{
msg_Warn( p_sql, "sqlite3 error: %d: %s",
sqlite3_errcode( p_sql->p_sys->db ),
sqlite3_errmsg( p_sql->p_sys->db ) );
i_ret = VLC_EGENERIC;
}
vlc_mutex_unlock( &p_sql->p_sys->lock );
return i_ret;
}
/**
* @brief Direct SQL Query
* @param p_sql This sql_t object
* @param query SQL query
* @param result Return value : Array of results
* @param nrow Return value : Row number
* @param ncol Return value : Column number
* @return VLC_SUCCESS or an error code
* You have to set and open current database first
* @todo Handle transaction closing due to errors in sql query
*/
static int Query( sql_t * p_sql,
const char * query,
char *** result,
int * nrow,
int * ncol )
{
assert( p_sql->p_sys->db );
int i_ret = VLC_SUCCESS;
vlc_mutex_lock( &p_sql->p_sys->lock );
#ifndef NDEBUG
msg_Dbg( p_sql, "Query: %s", query );
#endif
sqlite3_get_table( p_sql->p_sys->db, query, result, nrow, ncol, NULL );
if( sqlite3_errcode( p_sql->p_sys->db ) != SQLITE_OK )
{
msg_Warn( p_sql, "sqlite3 error: %d: %s",
sqlite3_errcode( p_sql->p_sys->db ),
sqlite3_errmsg( p_sql->p_sys->db ) );
i_ret = VLC_EGENERIC;
}
vlc_mutex_unlock( &p_sql->p_sys->lock );
return i_ret;
}
/**
* @brief Get tables in database
* @param p_sql This sql_t object
* @param result SQL query result
* @return Number of elements
* You have to set and open current database first
*/
static int GetTables( sql_t * p_sql,
char *** result )
{
int nrow, i_num = -1;
vlc_mutex_lock( &p_sql->p_sys->lock );
assert( p_sql->p_sys->db );
sqlite3_get_table( p_sql->p_sys->db, "SELECT * FROM sqlite_master;",
result, &nrow, &i_num, NULL );
if( sqlite3_errcode( p_sql->p_sys->db ) != SQLITE_OK )
{
msg_Warn( p_sql, "sqlite3 error: %d: %s",
sqlite3_errcode( p_sql->p_sys->db ),
sqlite3_errmsg( p_sql->p_sys->db ) );
}
vlc_mutex_unlock( &p_sql->p_sys->lock );
return i_num;
}
/**
* @brief Free SQL request's result
* @param p_sql This SQL object.
* @param ppsz_result SQL result to free
*/
static void FreeResult( sql_t * p_sql, char **ppsz_result )
{
VLC_UNUSED( p_sql );
if( ppsz_result != NULL )
sqlite3_free_table( ppsz_result );
}
/**
* @brief vmprintf replacement for SQLite.
* @param psz_fmt Format string
* @param args va_list of arguments
* This function implements the formats %q, %Q and %z.
*/
static char* VMSprintf( const char* psz_fmt, va_list args )
{
char *psz = sqlite3_vmprintf( psz_fmt, args );
char *ret = strdup( psz );
sqlite3_free( psz );
return ret;
}
/**
* @brief Starts a Transaction and waits if necessary
* @param p_sql The SQL object
* @note This function locks the transactions on the database.
* Within the period of the transaction, only the calling thread may
* execute sql statements provided all threads use these transaction fns.
*/
static int BeginTransaction( sql_t* p_sql )
{
int i_ret = VLC_SUCCESS;
vlc_mutex_lock( &p_sql->p_sys->trans_lock );
vlc_mutex_lock( &p_sql->p_sys->lock );
assert( p_sql->p_sys->db );
sqlite3_exec( p_sql->p_sys->db, "BEGIN;", NULL, NULL, NULL );
#ifndef NDEBUG
msg_Dbg( p_sql, "Transaction Query: BEGIN;" );
#endif
if( sqlite3_errcode( p_sql->p_sys->db ) != SQLITE_OK )
{
vlc_mutex_unlock( &p_sql->p_sys->trans_lock );
vlc_mutex_unlock( &p_sql->p_sys->lock );
msg_Warn( p_sql, "sqlite3 error: %d: %s",
sqlite3_errcode( p_sql->p_sys->db ),
sqlite3_errmsg( p_sql->p_sys->db ) );
i_ret = VLC_EGENERIC;
}
vlc_mutex_unlock( &p_sql->p_sys->lock );
return i_ret;
}
/**
* @brief Commit a transaction
* @param p_sql The SQL object
* @note This function unlocks the transactions on the database
* Only the calling thread of "BeginTransaction" is allowed to call this method
* If the commit fails, the transaction lock is still held by the thread
* and this function may be retried or RollbackTransaction can be called
* @return VLC_SUCCESS or VLC_EGENERIC
*/
static int CommitTransaction( sql_t* p_sql )
{
int i_ret = VLC_SUCCESS;
assert( p_sql->p_sys->db );
vlc_mutex_lock( &p_sql->p_sys->lock );
/** This turns the auto commit on. */
sqlite3_exec( p_sql->p_sys->db, "COMMIT;", NULL, NULL, NULL );
#ifndef NDEBUG
msg_Dbg( p_sql, "Transaction Query: COMMIT;" );
#endif
if( sqlite3_errcode( p_sql->p_sys->db ) != SQLITE_OK )
{
msg_Warn( p_sql, "sqlite3 error: %d: %s",
sqlite3_errcode( p_sql->p_sys->db ),
sqlite3_errmsg( p_sql->p_sys->db ) );
i_ret = VLC_EGENERIC;
}
else
vlc_mutex_unlock( &p_sql->p_sys->trans_lock );
vlc_mutex_unlock( &p_sql->p_sys->lock );
return i_ret;
}
/**
* @brief Rollback a transaction, in case of failure
* @param p_sql The SQL object
* @return VLC_SUCCESS or VLC_EGENERIC
* @note This function unlocks the transactions on the database
* Only the calling thread of "BeginTransaction" is allowed to call this method
* If failed, if a statement in the transaction failed, it means that
* the transaction was automatically rolled back
* If failed otherwise, the engine is busy executing some queries and you must
* try again
*/
static void RollbackTransaction( sql_t* p_sql )
{
assert( p_sql->p_sys->db );
vlc_mutex_lock( &p_sql->p_sys->lock );
sqlite3_exec( p_sql->p_sys->db, "ROLLBACK;", NULL, NULL, NULL );
#ifndef NDEBUG
msg_Dbg( p_sql, "Transaction Query: ROLLBACK;" );
#endif
if( sqlite3_errcode( p_sql->p_sys->db ) != SQLITE_OK )
{
msg_Err( p_sql, "sqlite3 error: %d: %s",
sqlite3_errcode( p_sql->p_sys->db ),
sqlite3_errmsg( p_sql->p_sys->db ) );
}
vlc_mutex_unlock( &p_sql->p_sys->trans_lock );
vlc_mutex_unlock( &p_sql->p_sys->lock );
}
/**
* Prepare an sqlite statement
* @return statement object or NULL in case of failure
*/
static sql_stmt_t* PrepareStatement( sql_t* p_sql, const char* psz_fmt, int i_length )
{
assert( p_sql->p_sys->db );
sql_stmt_t* p_stmt;
p_stmt = calloc( 1, sizeof( *p_stmt ) );
if( p_stmt == NULL )
return NULL;
vlc_mutex_lock( &p_sql->p_sys->lock );
if( sqlite3_prepare_v2( p_sql->p_sys->db, psz_fmt, i_length,
&p_stmt->p_sqlitestmt, NULL ) != SQLITE_OK )
{
msg_Warn( p_sql, "sqlite3 error: %d: %s",
sqlite3_errcode( p_sql->p_sys->db ),
sqlite3_errmsg( p_sql->p_sys->db ) );
vlc_mutex_unlock( &p_sql->p_sys->lock );
free( p_stmt );
return NULL;
}
vlc_mutex_unlock( &p_sql->p_sys->lock );
return p_stmt;
}
/**
* @brief Bind arguments to a sql_stmt_t object
* @param p_sql The SQL object
* @param p_stmt Statement Object
* @param i_pos Position at which the parameter should be bound
* @param i_type Data type of the value
* @param p_value Value to be bound
* @return VLC_SUCCESS or VLC_EGENERIC
*/
static int BindValues( sql_t* p_sql, sql_stmt_t* p_stmt,
int i_pos, unsigned int i_type, const sql_value_t* p_value )
{
assert( p_sql->p_sys->db );
assert( p_stmt->p_sqlitestmt );
vlc_mutex_lock( &p_sql->p_sys->lock );
int i_ret, i_vlc_ret = VLC_SUCCESS;
switch( i_type )
{
case SQL_INT:
i_ret = sqlite3_bind_int( p_stmt->p_sqlitestmt, i_pos, p_value->value.i );
break;
case SQL_DOUBLE:
i_ret = sqlite3_bind_double( p_stmt->p_sqlitestmt, i_pos, p_value->value.dbl );
break;
case SQL_TEXT:
i_ret = sqlite3_bind_text( p_stmt->p_sqlitestmt, i_pos, p_value->value.psz, p_value->length, NULL );
break;
case SQL_BLOB:
i_ret = sqlite3_bind_blob( p_stmt->p_sqlitestmt, i_pos, p_value->value.ptr, p_value->length, NULL );
break;
case SQL_NULL:
i_ret = sqlite3_bind_null( p_stmt->p_sqlitestmt, i_pos );
break;
default:
msg_Warn( p_sql, "Trying to bind invalid type of value %d", i_type );
vlc_mutex_unlock( &p_sql->p_sys->lock );
return VLC_EGENERIC;
}
if( i_ret != SQLITE_OK )
{
msg_Warn( p_sql, "sqlite3 error: %d: %s",
sqlite3_errcode( p_sql->p_sys->db ),
sqlite3_errmsg( p_sql->p_sys->db ) );
i_vlc_ret = VLC_EGENERIC;
}
vlc_mutex_unlock( &p_sql->p_sys->lock );
return i_vlc_ret;
}
/**
* @brief Run the SQL statement. If the statement fetches data, then only
* one row of the data is fetched at a time. Run this function again to
* fetch the next row.
* @param p_sql The SQL object
* @param p_stmt The statement
* @return VLC_SQL_DONE if done fetching all rows or there are no rows to fetch
* VLC_SQL_ROW if a row was fetched for this statement.
* VLC_EGENERIC if this function failed
*/
static int StatementStep( sql_t* p_sql, sql_stmt_t* p_stmt )
{
assert( p_sql->p_sys->db );
assert( p_stmt->p_sqlitestmt );
vlc_mutex_lock( &p_sql->p_sys->lock );
int i_sqlret = sqlite3_step( p_stmt->p_sqlitestmt );
int i_ret = VLC_EGENERIC;
if( i_sqlret == SQLITE_ROW )
i_ret = VLC_SQL_ROW;
else if( i_ret == SQLITE_DONE )
i_ret = VLC_SQL_DONE;
else
{
msg_Warn( p_sql, "sqlite3 error: %d: %s",
sqlite3_errcode( p_sql->p_sys->db ),
sqlite3_errmsg( p_sql->p_sys->db ) );
i_ret = VLC_EGENERIC;
}
vlc_mutex_unlock( &p_sql->p_sys->lock );
return i_ret;
}
/**
* @brief Reset the SQL statement. Resetting the statement will unbind all
* the values that were bound on this statement
* @param p_sql The SQL object
* @param p_stmt The sql statement object
* @return VLC_SUCCESS or VLC_EGENERIC
*/
static int StatementReset( sql_t* p_sql, sql_stmt_t* p_stmt )
{
assert( p_sql->p_sys->db );
assert( p_stmt->p_sqlitestmt );
int i_ret = VLC_SUCCESS;
vlc_mutex_lock( &p_sql->p_sys->lock );
if( sqlite3_reset( p_stmt->p_sqlitestmt ) != SQLITE_OK )
{
msg_Warn( p_sql, "sqlite3 error: %d: %s",
sqlite3_errcode( p_sql->p_sys->db ),
sqlite3_errmsg( p_sql->p_sys->db ) );
i_ret = VLC_EGENERIC;
}
vlc_mutex_unlock( &p_sql->p_sys->lock );
return i_ret;
}
/**
* @brief Destroy the sql statement object. This will free memory.
* @param p_sql The SQL object
* @param p_stmt The statement object
* @return VLC_SUCCESS or VLC_EGENERIC
*/
static int StatementFinalize( sql_t* p_sql, sql_stmt_t* p_stmt )
{
assert( p_sql->p_sys->db );
assert( p_stmt->p_sqlitestmt );
int i_ret = VLC_SUCCESS;
vlc_mutex_lock( &p_sql->p_sys->lock );
if( sqlite3_finalize( p_stmt->p_sqlitestmt ) != SQLITE_OK )
{
msg_Warn( p_sql, "sqlite3 error: %d: %s",
sqlite3_errcode( p_sql->p_sys->db ),
sqlite3_errmsg( p_sql->p_sys->db ) );
i_ret = VLC_EGENERIC;
}
free( p_stmt );
vlc_mutex_unlock( &p_sql->p_sys->lock );
return i_ret;
}
/**
* @brief Get the column data
* @param p_sql The SQL object
* @param p_stmt The statement object
* @param i_col The column number
* @param type Datatype of result
* @param p_res The structure which contains the value of the result
* @return VLC_SUCCESS or VLC_EGENERIC
*/
static int GetColumnFromStatement( sql_t* p_sql, sql_stmt_t* p_stmt, int i_col,
int type, sql_value_t *p_res )
{
assert( p_sql->p_sys->db );
assert( p_stmt->p_sqlitestmt );
int i_ret = VLC_SUCCESS;
vlc_mutex_lock( &p_sql->p_sys->lock );
const unsigned char* psz;
const void* ptr;
int size;
switch( type )
{
case SQL_INT:
p_res->value.i = sqlite3_column_int( p_stmt->p_sqlitestmt, i_col );
break;
case SQL_DOUBLE:
p_res->value.dbl = sqlite3_column_double( p_stmt->p_sqlitestmt, i_col );
break;
case SQL_TEXT:
psz = sqlite3_column_text( p_stmt->p_sqlitestmt, i_col );
if( psz )
p_res->value.psz = strdup( (const char* ) psz );
break;
case SQL_BLOB:
ptr = sqlite3_column_blob( p_stmt->p_sqlitestmt, i_col );
size = sqlite3_column_bytes( p_stmt->p_sqlitestmt, i_col );
if( ptr )
{
p_res->value.ptr = malloc( size );
p_res->length = size;
if( p_res->value.ptr )
memcpy( p_res->value.ptr, ptr, size );
else
i_ret = VLC_ENOMEM;
}
break;
case SQL_NULL:
default:
msg_Warn( p_sql, "Trying to bind invalid type of value %d", type );
i_ret = VLC_EGENERIC;
}
vlc_mutex_unlock( &p_sql->p_sys->lock );
return i_ret;
}
/**
* @brief Get the datatype of the result of the column
* @param p_sql The SQL object
* @param p_stmt The sql statement object
* @param i_col The column
* @param pi_type pointer to datatype of the given column
* @return VLC_SUCCESS or VLC_EGENERIC
*/
static int GetColumnTypeFromStatement( sql_t* p_sql, sql_stmt_t* p_stmt, int i_col,
int* pi_type )
{
assert( p_sql->p_sys->db );
assert( p_stmt->p_sqlitestmt );
assert( pi_type );
vlc_mutex_lock( &p_sql->p_sys->lock );
int i_ret = VLC_SUCCESS;
int i_sqlret = sqlite3_column_type( p_stmt->p_sqlitestmt, i_col );
switch( i_sqlret )
{
case SQLITE_INTEGER:
*pi_type = SQL_INT;
break;
case SQLITE_FLOAT:
*pi_type= SQL_DOUBLE;
break;
case SQLITE_TEXT:
*pi_type = SQL_TEXT;
break;
case SQLITE_BLOB:
*pi_type = SQL_BLOB;
break;
case SQLITE_NULL:
*pi_type = SQL_NULL;
break;
default:
i_ret = VLC_EGENERIC;
}
vlc_mutex_unlock( &p_sql->p_sys->lock );
return i_ret;
}
/**
* @brief Get the size of the column in bytes
* @param p_sql The SQL object
* @param p_stmt The sql statement object
* @param i_col The column
* @return Size of the column in bytes, undefined for invalid columns
*/
static int GetColumnSize( sql_t* p_sql, sql_stmt_t* p_stmt, int i_col )
{
assert( p_sql->p_sys->db );
assert( p_stmt->p_sqlitestmt );
return sqlite3_column_bytes( p_stmt->p_sqlitestmt, i_col );
}
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