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#pragma once
#include "Driver.h"
#include "Host.h"
#include "SequentialConnection.h"
namespace sql {
/**
* PostgreSQL connection.
*/
class PostgreSQL : public SequentialConnection {
STORM_CLASS;
public:
// Create.
STORM_CTOR PostgreSQL(Host host, MAYBE(Str *) user, MAYBE(Str *) password, Str *database);
// Destructor, calls 'close'.
virtual ~PostgreSQL();
// Close the connection.
void STORM_FN close() override;
// Prepares a statement for execution.
Statement *STORM_FN prepare(Str *query) override;
using SequentialConnection::prepare;
// Returns all names of tables in MariaDB connection in an Array of Str.
Array<Str*> *STORM_FN tables() override;
// Returns a Schema.
MAYBE(Schema *) STORM_FN schema(Str *table) override;
// Migrate.
void STORM_FN migrate(Migration *migration) override;
// Get features.
features::DBFeatures STORM_FN features() const override;
protected:
// Visitors.
QueryStr::Visitor *STORM_FN visitor() const override;
// Transaction management.
void STORM_FN beginTransaction() override;
void STORM_FN endTransaction(Transaction::End end) override;
// Throw an error if one is present.
void throwError();
/**
* Interface from SequentialConnection.
*/
// Finalize a statement.
virtual void STORM_FN finalizeStmt(SequentialStatement *stmt) override;
private:
// Handle.
UNKNOWN(PTR_NOGC) PGconn *connection;
// Cancellation handle, new version.
UNKNOWN(PTR_NOGC) PGcancelConn *newCancel;
// Cancellation handle, old version.
UNKNOWN(PTR_NOGC) PGcancel *oldCancel;
// PostgreSQL driver (access to the API).
UNKNOWN(PTR_NOGC) const PGDriver *driver;
// Counter for names of prepared statements.
Nat nextNameId;
// Query for retrieving the last row id.
Statement *lastRowIdQuery;
// Get a new name of a prepared statement.
const char *nextName();
// Query for the last row ID.
Int getLastRowId();
// Free result after checking for errors.
void checkAndClear(PGresult *result);
// Helper to migrate a single table.
void migrateTable(Migration::Table *migration);
// One-off queries.
void query(const char *query);
void query(Str *query);
void query(QueryStr *query);
// Get a single string from a query. We use it to find constraints.
MAYBE(Str *) queryStr(Str *query);
public:
/**
* Prepared statement.
*/
class Stmt : public SequentialStatement {
STORM_CLASS;
public:
// Bind parameters.
void STORM_FN bind(Nat pos, Str *str) override;
void STORM_FN bind(Nat pos, Bool b) override;
void STORM_FN bind(Nat pos, Int i) override;
void STORM_FN bind(Nat pos, Long l) override;
void STORM_FN bind(Nat pos, Float f) override;
void STORM_FN bind(Nat pos, Double d) override;
void STORM_FN bindNull(Nat pos) override;
protected:
// Get last row id and changes.
Int STORM_FN lastRowId() override { return lastId; }
Nat STORM_FN changes() override { return lastChanges; }
// Execute the query.
Bool STORM_FN executeSeq() override;
// Get next row.
Maybe<Row> STORM_FN nextRowSeq() override;
// Dispose result.
void STORM_FN disposeResultSeq() override;
private:
friend class PostgreSQL;
// Create.
Stmt(PostgreSQL *owner, Str *query);
// Helper to free the stmt.
void free();
// Name of this prepared statement.
const char *name;
// Saved row id.
Int lastId;
// Saved number of changes.
Nat lastChanges;
// Are we currently streaming data from the database? (i.e. is it worth trying to cancel?)
Bool streamingData;
// Number of prepared parameters and their types. These are allocated from the regular C++ heap.
Nat paramCount;
Oid *paramTypes;
char **paramVals;
int *paramLengths;
int *paramFormats;
// Number of columns in the output. This is to determine if we return any form of result or not.
Nat fieldCount;
// Get the owner.
PostgreSQL *owner() const {
return reinterpret_cast<PostgreSQL *>(connection());
}
// Get the driver.
const PGDriver &driver() const {
return *owner()->driver;
}
// Get the connection.
PGconn *pgConnection() const {
return owner()->connection;
}
// Check if an error has occurred, and make sure to clear the result.
void checkAndClear(PGresult *result);
// Ensure that a parameter has a specific length.
void ensureLength(Nat id, Nat length);
};
/**
* Visitor.
*/
class Visitor : public QueryStr::Visitor {
STORM_CLASS;
public:
STORM_CTOR Visitor();
// Number of placeholders used.
Nat placeholderCount;
void STORM_FN name(StrBuf *to, Str *name) override;
void STORM_FN placeholder(StrBuf *to) override;
void STORM_FN type(StrBuf *to, QueryType type) override;
void STORM_FN autoIncrement(StrBuf *to) override;
void STORM_FN lastRowId(StrBuf *to) override;
};
};
}
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