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mysql: allocate memory for each string and blob dynamically depending on its value length (#18214)

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This commit is contained in:
Mark aka walkingdevel
2023-05-21 13:24:43 +00:00
committed by GitHub
parent f833188234
commit ce0591da8d
2 changed files with 45 additions and 26 deletions
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19
vlib/db/mysql/stmt.c.v
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@ -61,6 +61,7 @@ fn C.mysql_stmt_bind_result(&C.MYSQL_STMT, &C.MYSQL_BIND) bool
fn C.mysql_stmt_fetch(&C.MYSQL_STMT) int
fn C.mysql_stmt_next_result(&C.MYSQL_STMT) int
fn C.mysql_stmt_store_result(&C.MYSQL_STMT) int
fn C.mysql_stmt_fetch_column(&C.MYSQL_STMT, &C.MYSQL_BIND, u32, u64) int
pub struct Stmt {
stmt &C.MYSQL_STMT = &C.MYSQL_STMT(unsafe { nil })
@ -248,14 +249,12 @@ pub fn (mut stmt Stmt) bind(typ int, buffer voidptr, buf_len u32) {
}
// bind_res will store one result in the statement `stmt`
pub fn (mut stmt Stmt) bind_res(fields &C.MYSQL_FIELD, dataptr []&u8, lens []u32, num_fields int) {
pub fn (mut stmt Stmt) bind_res(fields &C.MYSQL_FIELD, dataptr []&u8, lengths []u32, num_fields int) {
for i in 0 .. num_fields {
len := unsafe { FieldType(fields[i].@type).get_len() }
stmt.res << C.MYSQL_BIND{
buffer_type: unsafe { fields[i].@type }
buffer: dataptr[i]
length: &lens[i]
buffer_length: len
length: &lengths[i]
}
}
}
@ -283,3 +282,15 @@ pub fn (mut stmt Stmt) store_result() ! {
return stmt.error(res)
}
}
// fetch_column fetches one column from the current result set row.
// `bind` provides the buffer where data should be placed.
// It should be set up the same way as for `mysql_stmt_bind_result()`.
// `column` indicates which column to fetch. The first column is numbered 0.
pub fn (mut stmt Stmt) fetch_column(bind &C.MYSQL_BIND, column int) ! {
result := C.mysql_stmt_fetch_column(stmt.stmt, bind, column, 0)
if result != 0 && stmt.get_error_msg() != '' {
return stmt.error(result)
}
}