stz-sqlite  Check-in [98c988150c]

defpackage sqlite :
   import core

public lostanza deftype Database :
   value: ptr<?>

extern sqlite3_open: (ptr<byte>, ptr<ptr<?>>) -> int
; int sqlite3_open(
;   const char *filename,   /* Database filename (UTF-8) */
;   sqlite3 **ppDb          /* OUT: SQLite db handle */
; );

public lostanza defn open (filename:ref<String>) -> ref<Database> :
   var ppDB:ptr<?>
   val status:int = call-c sqlite3_open(addr!(filename.chars), ppDB)
   if status != 0 :
      fatal(append(String("open failed due to ") String(status)))
   return new Database{ppDB}


extern sqlite3_close_v2: (ptr<?>) -> int
; int sqlite3_close_v2(sqlite3*);
public lostanza defn close (db:ref<Database>) -> ref<Int> :
   val i:int = sqlite3_close_v2(db.value)
   return new Int{i}

public lostanza deftype Statement :
   value: ptr<?>

; To execute an SQL query, it must first be compiled into a byte-code program using
; one of these routines.
extern sqlite3_prepare_v2: (ptr<?>, ptr<byte>, int, ptr<?>, ptr<ptr<byte>>) -> int
; int sqlite3_prepare_v2(
;   sqlite3 *db,            /* Database handle */
;   const char *zSql,       /* SQL statement, UTF-8 encoded */
;   int nByte,              /* Maximum length of zSql in bytes. */
;   sqlite3_stmt **ppStmt,  /* OUT: Statement handle */
;   const char **pzTail     /* OUT: Pointer to unused portion of zSql */
; );
lostanza defn prepare (db:ptr<?>, sql:ref<String>) -> ref<Statement> :
   var stmt:ptr<?>
   var tail:ptr<ptr<byte>>
   call-c sqlite3_prepare_v2(db, addr!(sql.chars), length(sql).value, stmt, tail)
   return new Statement{stmt}

; After a prepared statement has been prepared using either sqlite3_prepare_v2()
; or sqlite3_prepare16_v2() or one of the legacy interfaces sqlite3_prepare() or
; sqlite3_prepare16(), this function must be called one or more times to evaluate
; the statement.
extern sqlite3_step: (ptr<?>) -> int
; int sqlite3_step(sqlite3_stmt*);
lostanza defn step (stmt:ref<Statement>) -> ref<Int> :
   val status:int = call-c sqlite3_step(stmt.value)
   return new Int{status}

extern sqlite3_column_blob: (ptr<?>, int) -> ptr<byte>
; const void *sqlite3_column_blob(sqlite3_stmt*, int iCol);
lostanza defn column-blob (stmt:Statement, col:ref<Int>) -> ref<String> :
   val bytes:ptr<byte> = call-c sqlite3_column_blob(stmt.value, col.value)
   return String(bytes)

extern sqlite3_column_bytes: (ptr<?>, int) -> int
; int sqlite3_column_bytes(sqlite3_stmt*, int iCol);
lostanza defn column-bytes (stmt:Statement, col:ref<Int>) -> ref<Int> :
   val size:int = call-c sqlite3_column_bytes(stmt.value, col.value)
   return new Int{size}

extern sqlite3_column_double: (ptr<?>, int) -> double
; double sqlite3_column_double(sqlite3_stmt*, int iCol);
lostanza defn column-double (stmt:Statement, col:ref<Int>) -> ref<Double> :
   val rval:double = call-c sqlite3_column_double(stmt.value, col.value)
   return new Double{rval}

extern sqlite3_column_int: (ptr<?>, int) -> int
; int sqlite3_column_int(sqlite3_stmt*, int iCol);
lostanza defn column-int (stmt:Statement, col:ref<Int>) -> ref<Int> :
   val rval:int = call-c sqlite3_column_int(stmt.value, col.value)
   return new Int{rval}

extern sqlite3_column_int64: (ptr<?>, int) -> long
; sqlite3_int64 sqlite3_column_int64(sqlite3_stmt*, int iCol);
lostanza defn column-long (stmt:Statement, col:ref<Int>) -> ref<Long> :
   val rval:long = call-c sqlite3_column_int64(stmt.value, col.value)
   return new Long{rval}

extern sqlite3_column_name: (ptr<?>, int) -> ptr<byte>
; const char *sqlite3_column_name(sqlite3_stmt*, int N);
lostanza defn column-name (stmt:Statement, col:ref<Int>) -> ref<String> :
   val bytes:ptr<byte> = call-c sqlite3_column_name(stmt.value, col.value)
   return String(bytes)

extern sqlite3_column_text: (ptr<?>, int) -> ptr<byte>
; const unsigned char *sqlite3_column_text(sqlite3_stmt*, int iCol);
lostanza defn column-text (stmt:Statement, col:ref<Int>) -> ref<String> :
   val bytes:ptr<byte> = call-c sqlite3_column_text(stmt.value, col.value)
   return String(bytes)

extern sqlite3_column_type: (ptr<?>, int) -> int
; int sqlite3_column_type(sqlite3_stmt*, int iCol);
lostanza defn column-type (stmt:Statement, col:ref<Int>) -> ref<Int> :
   val type-code:int = call-c sqlite3_column_type(stmt.value, col.value)
   return new Int{type-code}

defpackage test-sqlite :
   import core
   import sqlite

val db = open(":memory:")
println("In-memory database opened")
close(db)
println("In-memory database closed")