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cnuodb.cpp
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cnuodb.cpp
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/*
Copyright (C) 2013 Timo Linna. All Rights Reserved.
*/
#include "cnuodb.h"
#include "NuoDB.h"
#include <algorithm>
#include <cstring>
#include <string>
using namespace NuoDB;
struct nuodb {
Connection *conn;
std::string error;
};
static int setError(struct nuodb *db, SQLException &e) {
db->error.assign(e.getText());
return e.getSqlcode();
}
static int closeDb(struct nuodb *db) {
if (db->conn) {
try {
db->conn->close();
db->conn = 0;
} catch (SQLException &e) {
return setError(db, e);
}
}
return 0;
}
void nuodb_init(struct nuodb **db) {
*db = new struct nuodb;
(*db)->conn = 0;
}
const char *nuodb_error(const struct nuodb *db) {
return db ? db->error.c_str() : "null db";
}
int nuodb_open(struct nuodb *db, const char *database, const char *username,
const char *password, const char *schema, const char *timezone) {
closeDb(db);
Connection *conn = 0;
try {
conn = Connection::create();
Properties *props = conn->allocProperties(); // TODO: freed on conn->close()?
props->putValue("user", username);
props->putValue("password", password);
if (schema && std::strlen(schema) > 0) {
props->putValue("schema", schema);
}
if (timezone && std::strlen(timezone) > 0) {
props->putValue("timezone", timezone);
}
conn->openDatabase(database, props);
conn->setAutoCommit(true); // enforce autocommit by default
db->conn = conn;
return 0;
} catch (SQLException &e) {
if (conn) {
conn->close();
}
return setError(db, e);
}
}
int nuodb_close(struct nuodb **db) {
int rc = 0;
if (db && *db) {
rc = closeDb(*db);
delete (*db);
*db = 0;
}
return rc;
}
int nuodb_autocommit(struct nuodb *db, int *state) {
try {
*state = db->conn->getAutoCommit();
return 0;
} catch (SQLException &e) {
return setError(db, e);
}
}
int nuodb_autocommit_set(struct nuodb *db, int state) {
try {
db->conn->setAutoCommit(!!state);
return 0;
} catch (SQLException &e) {
return setError(db, e);
}
}
int nuodb_commit(struct nuodb *db) {
try {
db->conn->commit();
return 0;
} catch (SQLException &e) {
return setError(db, e);
}
}
int nuodb_rollback(struct nuodb *db) {
try {
db->conn->rollback();
return 0;
} catch (SQLException &e) {
return setError(db, e);
}
}
int nuodb_statement_prepare(struct nuodb *db, const char *sql,
struct nuodb_statement **st, int *parameter_count) {
PreparedStatement *stmt = 0;
try {
stmt = db->conn->prepareStatement(sql, RETURN_GENERATED_KEYS);
*parameter_count = stmt->getParameterMetaData()->getParameterCount();
*st = reinterpret_cast<struct nuodb_statement *>(stmt);
return 0;
} catch (SQLException &e) {
if (stmt) {
stmt->close();
}
return setError(db, e);
}
}
int nuodb_statement_bind(struct nuodb *db, struct nuodb_statement *st,
struct nuodb_value parameters[]) {
PreparedStatement *stmt = reinterpret_cast<PreparedStatement *>(st);
try {
int parameterCount = stmt->getParameterMetaData()->getParameterCount();
for (int i=0; i < parameterCount; ++i) {
int parameterIndex = i+1;
switch (parameters[i].vt) {
case NUODB_TYPE_NULL:
stmt->setNull(parameterIndex, NUOSQL_NULL);
break;
case NUODB_TYPE_INT64:
stmt->setLong(parameterIndex, parameters[i].i64);
break;
case NUODB_TYPE_FLOAT64: {
union {
int64_t i64;
double float64;
} value = { parameters[i].i64 };
stmt->setDouble(parameterIndex, value.float64);
break;
}
case NUODB_TYPE_BOOL:
stmt->setBoolean(parameterIndex, !!parameters[i].i64);
break;
case NUODB_TYPE_STRING: {
union {
int64_t i64;
const char *bytes;
} value = { parameters[i].i64 };
// Extra conversion due to missing length param from the setString API
std::string str(value.bytes, parameters[i].i32);
stmt->setString(parameterIndex, str.c_str());
break;
}
case NUODB_TYPE_BYTES: {
union {
int64_t i64;
const unsigned char *bytes;
} value = { parameters[i].i64 };
stmt->setBytes(parameterIndex, parameters[i].i32, value.bytes);
break;
}
case NUODB_TYPE_TIME: {
int64_t seconds = parameters[i].i64;
int32_t nanos = parameters[i].i32;
SqlTimestamp ts(seconds, nanos);
stmt->setTimestamp(parameterIndex, &ts);
break;
}
}
}
return 0;
} catch (SQLException &e) {
if (stmt) {
stmt->close();
}
return setError(db, e);
}
}
int nuodb_statement_execute(struct nuodb *db, struct nuodb_statement *st,
struct nuodb_resultset **rs, int *column_count, int64_t *affected_rows) {
ResultSet *resultSet = 0;
PreparedStatement *stmt = reinterpret_cast<PreparedStatement *>(st);
try {
int updateCount;
bool hasResults = stmt->execute();
if (hasResults) {
resultSet = stmt->getResultSet();
updateCount = 0;
} else {
resultSet = stmt->getGeneratedKeys();
// NuoDB uses -1 as a flag for zero-rows-affected
updateCount = std::max(0, stmt->getUpdateCount());
}
*column_count = resultSet->getMetaData()->getColumnCount();
*affected_rows = updateCount;
*rs = reinterpret_cast<struct nuodb_resultset *>(resultSet);
return 0;
} catch (SQLException &e) {
if (resultSet) {
resultSet->close();
}
return setError(db, e);
}
}
int nuodb_statement_close(struct nuodb *db, struct nuodb_statement **st) {
try {
if (st && *st) {
PreparedStatement *stmt = reinterpret_cast<PreparedStatement *>(*st);
stmt->close();
*st = 0;
}
return 0;
} catch (SQLException &e) {
return setError(db, e);
}
}
int nuodb_resultset_last_insert_id(struct nuodb *db, struct nuodb_resultset *rs,
int64_t *last_insert_id) {
ResultSet *resultSet = reinterpret_cast<ResultSet *>(rs);
try {
int64_t lastInsertId = 0;
if (resultSet->getMetaData()->getColumnCount() == 1) {
while (resultSet->next()) {
// TODO find out how to read the last id first
}
lastInsertId = resultSet->getLong(1);
}
*last_insert_id = lastInsertId;
return 0;
} catch (SQLException &e) {
return setError(db, e);
}
}
int nuodb_resultset_column_names(struct nuodb *db, struct nuodb_resultset *rs,
struct nuodb_value names[]) {
ResultSet *resultSet = reinterpret_cast<ResultSet *>(rs);
try {
ResultSetMetaData *resultSetMetaData = resultSet->getMetaData();
int columnCount = resultSetMetaData->getColumnCount();
for (int i=0; i < columnCount; ++i) {
int columnIndex = i+1;
union {
const char *string;
int64_t i64;
} value = { resultSetMetaData->getColumnLabel(columnIndex) };
names[i].i64 = value.i64;
}
return 0;
} catch (SQLException &e) {
return setError(db, e);
}
}
int nuodb_resultset_next(struct nuodb *db, struct nuodb_resultset *rs,
int *has_values, int *bytes_count, struct nuodb_value values[]) {
ResultSet *resultSet = reinterpret_cast<ResultSet *>(rs);
try {
int bytesCount = 0;
*has_values = resultSet->next();
if (*has_values) {
ResultSetMetaData *resultSetMetaData = resultSet->getMetaData();
int columnCount = resultSetMetaData->getColumnCount();
for (int i=0; i < columnCount; ++i) {
int64_t i64 = 0;
int32_t i32 = 0;
enum nuodb_value_type vt = NUODB_TYPE_NULL;
int columnIndex = i+1;
switch (resultSetMetaData->getColumnType(columnIndex)) {
case NUOSQL_NULL:
vt = NUODB_TYPE_NULL;
break;
case NUOSQL_TINYINT:
case NUOSQL_SMALLINT:
case NUOSQL_INTEGER:
case NUOSQL_BIGINT:
if (resultSetMetaData->getScale(columnIndex) == 0) {
i64 = resultSet->getLong(columnIndex);
if (!resultSet->wasNull()) {
vt = NUODB_TYPE_INT64;
}
break;
}
// fallthrough; must be fetched as a string
case NUOSQL_NUMERIC:
case NUOSQL_DECIMAL: {
const char *str = resultSet->getString(columnIndex);
if (str && !resultSet->wasNull()) {
vt = NUODB_TYPE_BYTES; // strings are returned as bytes
i32 = std::strlen(str);
bytesCount += i32;
}
break;
}
case NUOSQL_FLOAT:
case NUOSQL_DOUBLE: {
union {
double float64;
int64_t i64;
} value = { resultSet->getDouble(columnIndex) };
if (!resultSet->wasNull()) {
vt = NUODB_TYPE_FLOAT64;
i64 = value.i64;
}
break;
}
case NUOSQL_BIT:
case NUOSQL_BOOLEAN:
i64 = resultSet->getBoolean(columnIndex);
if (!resultSet->wasNull()) {
vt = NUODB_TYPE_BOOL;
}
break;
case NUOSQL_DATE:
case NUOSQL_TIME:
case NUOSQL_TIMESTAMP: {
Timestamp *ts = resultSet->getTimestamp(columnIndex);
if (ts && !resultSet->wasNull()) {
vt = NUODB_TYPE_TIME;
i64 = ts->getSeconds();
i32 = ts->getNanos();
}
break;
}
default: {
const Bytes b = resultSet->getBytes(columnIndex);
if (!resultSet->wasNull()) {
vt = NUODB_TYPE_BYTES;
i32 = b.length;
bytesCount += i32;
}
break;
}
}
values[i].i64 = i64;
values[i].i32 = i32;
values[i].vt = vt;
}
}
*bytes_count = bytesCount;
return 0;
} catch (SQLException &e) {
return setError(db, e);
}
}
int nuodb_resultset_bytes(struct nuodb *db, struct nuodb_resultset *rs, unsigned char *bytes) {
ResultSet *resultSet = reinterpret_cast<ResultSet *>(rs);
try {
ResultSetMetaData *resultSetMetaData = resultSet->getMetaData();
int columnCount = resultSetMetaData->getColumnCount();
for (int i=0; i < columnCount; ++i) {
int columnIndex = i+1;
switch (resultSetMetaData->getColumnType(columnIndex)) {
case NUOSQL_NULL:
case NUOSQL_FLOAT:
case NUOSQL_DOUBLE:
case NUOSQL_BIT:
case NUOSQL_BOOLEAN:
case NUOSQL_DATE:
case NUOSQL_TIME:
case NUOSQL_TIMESTAMP:
break; // skip
case NUOSQL_TINYINT:
case NUOSQL_SMALLINT:
case NUOSQL_INTEGER:
case NUOSQL_BIGINT:
if (resultSetMetaData->getScale(columnIndex) == 0) {
break; // skip
}
// fallthrough; must be fetched as a string
case NUOSQL_NUMERIC:
case NUOSQL_DECIMAL: {
const char *str = resultSet->getString(columnIndex);
if (str && !resultSet->wasNull()) {
size_t length = std::strlen(str);
std::memcpy(bytes, str, length);
bytes += length;
}
break;
}
default: {
const Bytes b = resultSet->getBytes(columnIndex);
if (!resultSet->wasNull()) {
std::memcpy(bytes, b.data, b.length);
bytes += b.length;
}
break;
}
}
}
return 0;
} catch (SQLException &e) {
return setError(db, e);
}
}
int nuodb_resultset_close(struct nuodb *db, struct nuodb_resultset **rs) {
try {
if (rs && *rs) {
ResultSet *resultSet = reinterpret_cast<ResultSet *>(*rs);
resultSet->close();
*rs = 0;
}
return 0;
} catch (SQLException &e) {
return setError(db, e);
}
}