* General structure: SQL object.
*****************************************************************************/
+/**
+ * Return values for the function @see sql_Run()
+ */
+#define VLC_SQL_ROW 1
+#define VLC_SQL_DONE 2
+
typedef struct sql_t sql_t;
typedef struct sql_sys_t sql_sys_t;
+typedef struct sql_stmt_t sql_stmt_t;
typedef int ( *sql_query_callback_t ) ( void*, int, char**, char** );
+typedef enum {
+ SQL_NULL,
+ SQL_INT,
+ SQL_DOUBLE,
+ SQL_TEXT,
+ SQL_BLOB
+} sql_type_e;
+
+typedef struct
+{
+ int length;
+ union
+ {
+ int i;
+ double dbl;
+ char* psz;
+ void* ptr;
+ } value;
+} sql_value_t;
+
struct sql_t
{
VLC_COMMON_MEMBERS
/** Internal data */
sql_sys_t *p_sys;
+ /** All the functions are implemented as threadsafe functions */
/** Perform a query with a row-by-row callback function */
int (*pf_query_callback) ( sql_t *, const char *, sql_query_callback_t, void * );
int (*pf_begin) ( sql_t* );
/** Commit transaction */
- void (*pf_commit) ( sql_t* );
+ int (*pf_commit) ( sql_t* );
/** Rollback transaction */
void (*pf_rollback) ( sql_t* );
-};
+ /** Create a statement object */
+ sql_stmt_t* (*pf_prepare) ( sql_t* p_sql, const char* p_fmt,
+ int i_length );
+
+ /** Bind parameters to a statement */
+ int (*pf_bind) ( sql_t* p_sql, sql_stmt_t* p_stmt, int i_pos,
+ unsigned int type, const sql_value_t* p_value );
+
+ /** Run the prepared statement */
+ int (*pf_run) ( sql_t* p_sql, sql_stmt_t* p_stmt );
+
+ /** Reset the prepared statement */
+ int (*pf_reset) ( sql_t* p_sql, sql_stmt_t* p_stmt );
+
+ /** Destroy the statement object */
+ int (*pf_finalize) ( sql_t* p_sql, sql_stmt_t* p_stmt );
+
+ /** Get the datatype for a specified column */
+ int (*pf_gettype) ( sql_t* p_sql, sql_stmt_t* p_stmt, int i_col,
+ int* type );
+
+ /** Get the data from a specified column */
+ int (*pf_getcolumn) ( sql_t* p_sql, sql_stmt_t* p_stmt, int i_col,
+ int type, sql_value_t *p_res );
+
+ /** Get column size of a specified column */
+ int (*pf_getcolumnsize) ( sql_t* p_sql, sql_stmt_t* p_stmt, int i_col );
+};
/*****************************************************************************
* SQL Function headers
* 4th is the columns names (array of strings).
* @param p_opaque Any pointer to an object you may need in the callback.
* @return VLC_SUCCESS or VLC_EGENERIC.
- * @note The query will not necessarily be processed in a separate thread!
+ * @note The query will not necessarily be processed in a separate thread, but
+ * it is threadsafe
**/
static inline int sql_QueryCallback( sql_t *p_sql, const char *psz_query,
sql_query_callback_t pf_callback,
* *pi_rows will be the number of result rows, so that the number of text rows
* in ppsz_result will be (*pi_rows + 1) (because of row 0).
* To get result[row,col] use (*pppsz_result)[ (row+1) * (*pi_cols) + col ].
+ * This function is threadsafe
**/
static inline int sql_Query( sql_t *p_sql, const char *psz_query,
char ***pppsz_result, int *pi_rows, int *pi_cols )
* @param pppsz_tables Pointer to an array of strings. Dynamically allocated.
* Similar to pppsz_result of sql_Query but with only one row.
* @return Number of tables or <0 in case of error.
+ * @note This function is threadsafe
**/
static inline int sql_GetTables( sql_t *p_sql, char ***pppsz_tables )
{
* @param p_sql This SQL object.
* @param ppsz_result The result of sql_Query or sql_GetTables. See above.
* @return Nothing.
+ * @note This function is threadsafe
**/
static inline void sql_Free( sql_t *p_sql, char **ppsz_result )
{
* @brief Begin a SQL transaction
* @param p_sql The SQL object
* @return VLC error code or success
+ * @note This function is threadsafe
**/
static inline int sql_BeginTransaction( sql_t *p_sql )
{
* @brief Commit a SQL transaction
* @param p_sql The SQL object
* @return VLC error code or success
+ * @note This function is threadsafe
**/
-static inline void sql_CommitTransaction( sql_t *p_sql )
+static inline int sql_CommitTransaction( sql_t *p_sql )
{
- p_sql->pf_commit( p_sql );
+ return p_sql->pf_commit( p_sql );
}
/**
* @brief Rollback a SQL transaction
* @param p_sql The SQL object
* @return VLC error code or success
+ * @note This function is threadsafe
**/
static inline void sql_RollbackTransaction( sql_t *p_sql )
{
p_sql->pf_rollback( p_sql );
}
+/**
+ * @brief Prepare an sql statement
+ * @param p_sql The SQL object
+ * @param p_fmt SQL query string
+ * @param i_length length of the string. If negative, length will be
+ * considered upto the first \0 character equivalent to strlen(p_fmt).
+ * Otherwise the first i_length bytes will be used
+ * @return a sql_stmt_t pointer or NULL on failure
+ */
+static inline sql_stmt_t* sql_Prepare( sql_t* p_sql, const char* p_fmt,
+ int i_length )
+{
+ return p_sql->pf_prepare( p_sql, p_fmt, i_length );
+}
+
+/**
+ * @brief Bind arguments to a sql_stmt_t object
+ * @param p_sql The SQL object
+ * @param p_stmt Statement Object
+ * @param type Data type of the value
+ * @param p_value Value to be bound
+ * @param i_pos Position at which the parameter should be bound
+ * @return VLC_SUCCESS or VLC_EGENERIC
+ */
+static inline int sql_BindGeneric( sql_t* p_sql, sql_stmt_t* p_stmt,
+ int i_pos, int type, const sql_value_t* p_value )
+{
+ return p_sql->pf_bind( p_sql, p_stmt, i_pos, type, p_value );
+}
+
+/**
+ * @brief Bind a NULL value to a position
+ * @param p_sql The SQL object
+ * @param p_stmt Statement Object
+ * @param i_pos Position at which the parameter should be bound
+ * @return VLC_SUCCESS or VLC_EGENERIC
+ */
+static inline int sql_BindNull( sql_t *p_sql, sql_stmt_t* p_stmt, int i_pos )
+{
+ int i_ret = sql_BindGeneric( p_sql, p_stmt, i_pos, SQL_NULL, NULL );
+ return i_ret;
+}
+
+/**
+ * @brief Bind an integer to the statement object at some position
+ * @param p_sql The SQL object
+ * @param p_stmt Statement Object
+ * @param i_pos Position at which the parameter should be bound
+ * @param i_int Value to be bound
+ * @return VLC_SUCCESS or VLC_EGENERIC
+ */
+static inline int sql_BindInteger( sql_t *p_sql, sql_stmt_t* p_stmt,
+ int i_pos, int i_int )
+{
+ sql_value_t value;
+ value.length = 0;
+ value.value.i = i_int;
+ int i_ret = sql_BindGeneric( p_sql, p_stmt, i_pos, SQL_INT, &value );
+ return i_ret;
+}
+
+/**
+ * @brief Bind a double to the statement object at some position
+ * @param p_sql The SQL object
+ * @param p_stmt Statement Object
+ * @param i_pos Position at which the parameter should be bound
+ * @param d_dbl Value to be bound
+ * @return VLC_SUCCESS or VLC_EGENERIC
+ */
+static inline int sql_BindDouble( sql_t *p_sql, sql_stmt_t* p_stmt,
+ int i_pos, double d_dbl )
+{
+ sql_value_t value;
+ value.length = 0;
+ value.value.dbl = d_dbl;
+ int i_ret = sql_BindGeneric( p_sql, p_stmt, i_pos, SQL_INT, &value );
+ return i_ret;
+}
+
+/**
+ * @brief Bind Text to the statement
+ * @param p_sql The SQL object
+ * @param p_stmt Statement Object
+ * @param i_pos Position at which the parameter should be bound
+ * @param p_fmt Value to be bound
+ * @param i_length Length of text. If -ve text upto the first null char
+ * will be selected.
+ * @return VLC_SUCCESS or VLC_EGENERIC
+ */
+static inline int sql_BindText( sql_t *p_sql, sql_stmt_t* p_stmt, int i_pos,
+ char* p_fmt, int i_length )
+{
+ sql_value_t value;
+ value.length = i_length;
+ value.value.psz = p_fmt;
+ int i_ret = sql_BindGeneric( p_sql, p_stmt, i_pos, SQL_TEXT, &value );
+ return i_ret;
+}
+
+/**
+ * @brief Bind a binary object to the statement
+ * @param p_sql The SQL object
+ * @param p_stmt Statement Object
+ * @param i_pos Position at which the parameter should be bound
+ * @param p_ptr Value to be bound
+ * @param i_length Size of the blob to read
+ * @return VLC_SUCCESS or VLC_EGENERIC
+ */
+static inline int sql_BindBlob( sql_t *p_sql, sql_stmt_t* p_stmt, int i_pos,
+ void* p_ptr, int i_length )
+{
+ sql_value_t value;
+ value.length = i_length;
+ value.value.ptr = p_ptr;
+ int i_ret = sql_BindGeneric( p_sql, p_stmt, i_pos, SQL_INT, &value );
+ return i_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 inline int sql_Run( sql_t* p_sql, sql_stmt_t* p_stmt )
+{
+ return p_sql->pf_run( p_sql, p_stmt );
+}
+
+/**
+ * @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 inline int sql_Reset( sql_t* p_sql, sql_stmt_t* p_stmt )
+{
+ return p_sql->pf_reset( p_sql, p_stmt );
+}
+
+/**
+ * @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 inline int sql_Finalize( sql_t* p_sql, sql_stmt_t* p_stmt )
+{
+ return p_sql->pf_finalize( p_sql, p_stmt );
+}
+
+/**
+ * @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 type pointer to datatype of the given column
+ * @return VLC_SUCCESS or VLC_EGENERIC
+ */
+static inline int sql_GetColumnType( sql_t* p_sql, sql_stmt_t* p_stmt,
+ int i_col, int* type )
+{
+ return p_sql->pf_gettype( p_sql, p_stmt, i_col, type );
+}
+
+/**
+ * @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 inline int sql_GetColumn( sql_t* p_sql, sql_stmt_t* p_stmt,
+ int i_col, int type, sql_value_t *p_res )
+{
+ return p_sql->pf_getcolumn( p_sql, p_stmt, i_col, type, p_res );
+}
+
+/**
+ * @brief Get an integer from the results of a statement
+ * @param p_sql The SQL object
+ * @param p_stmt The statement object
+ * @param i_col The column number
+ * @param i_res Pointer of the location for result to be stored
+ * @return VLC_SUCCESS or VLC_EGENERIC
+ */
+static inline int sql_GetColumnInteger( sql_t* p_sql, sql_stmt_t* p_stmt,
+ int i_col, int* pi_res )
+{
+ sql_value_t tmp;
+ int i_ret = p_sql->pf_getcolumn( p_sql, p_stmt, i_col, SQL_INT, &tmp );
+ if( i_ret == VLC_SUCCESS )
+ *pi_res = tmp.value.i;
+ return i_ret;
+}
+
+/**
+ * @brief Get a double from the results of a statement
+ * @param p_sql The SQL object
+ * @param p_stmt The statement object
+ * @param i_col The column number
+ * @param d_res Pointer of the location for result to be stored
+ * @return VLC_SUCCESS or VLC_EGENERIC
+ */
+static inline int sql_GetColumnDouble( sql_t* p_sql, sql_stmt_t* p_stmt,
+ int i_col, double* pd_res )
+{
+ sql_value_t tmp;
+ int i_ret = p_sql->pf_getcolumn( p_sql, p_stmt, i_col, SQL_DOUBLE, &tmp );
+ if( i_ret == VLC_SUCCESS )
+ *pd_res = tmp.value.dbl;
+ return i_ret;
+}
+
+/**
+ * @brief Get some text from the results of a statement
+ * @param p_sql The SQL object
+ * @param p_stmt The statement object
+ * @param i_col The column number
+ * @param pp_res Pointer of the location for result to be stored
+ * @return VLC_SUCCESS or VLC_EGENERIC
+ */
+static inline int sql_GetColumnText( sql_t* p_sql, sql_stmt_t* p_stmt,
+ int i_col, char** pp_res )
+{
+ sql_value_t tmp;
+ int i_ret = p_sql->pf_getcolumn( p_sql, p_stmt, i_col, SQL_TEXT, &tmp );
+ if( i_ret == VLC_SUCCESS )
+ *pp_res = tmp.value.psz;
+ return i_ret;
+}
+
+/**
+ * @brief Get a blob from the results of a statement
+ * @param p_sql The SQL object
+ * @param p_stmt The statement object
+ * @param i_col The column number
+ * @param pp_res Pointer of the location for result to be stored
+ * @return VLC_SUCCESS or VLC_EGENERIC
+ */
+static inline int sql_GetColumnBlob( sql_t* p_sql, sql_stmt_t* p_stmt,
+ int i_col, void** pp_res )
+{
+ sql_value_t tmp;
+ int i_ret = p_sql->pf_getcolumn( p_sql, p_stmt, i_col, SQL_BLOB, &tmp );
+ if( i_ret == VLC_SUCCESS )
+ *pp_res = tmp.value.ptr;
+ 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, excluding the zero terminator
+ */
+static inline int sql_GetColumnSize( sql_t* p_sql, sql_stmt_t* p_stmt,
+ int i_col )
+{
+ return p_sql->pf_getcolumnsize( p_sql, p_stmt, i_col );
+}
+
# ifdef __cplusplus
}
# endif /* C++ extern "C" */
projects / vlc / blobdiff