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#include "querygenerator.h"
#include "common/global.h"
#include "common/utils_sql.h"
#include "db/db.h"
#include "common/unused.h"
QueryGenerator::QueryGenerator()
{
}
QString QueryGenerator::generateSelectFromTable(Db* db, const QString& table, const StrHash<QVariantList> values)
{
return generateSelectFromTable(db, QString(), table, values);
}
QString QueryGenerator::generateSelectFromTable(Db* db, const QString& database, const QString& table, const StrHash<QVariantList> values)
{
SchemaResolver resolver(db);
QStringList columns = resolver.getTableColumns(database, table);
return generateSelectFromTableOrView(db, database, table, columns, values);
}
QString QueryGenerator::generateInsertToTable(Db* db, const QString& table, const StrHash<QVariantList> values)
{
return generateInsertToTable(db, QString(), table, values);
}
QString QueryGenerator::generateInsertToTable(Db* db, const QString& database, const QString& table, StrHash<QVariantList> values)
{
static_qstring(tpl, "INSERT INTO %1 (%2) VALUES %3");
static_qstring(rowTpl, "(%1)");
QString target = toFullObjectName(database, table);
// Get all table's columns
SchemaResolver resolver(db);
QStringList tableCols = resolver.getTableColumns(database, table);
// If no values were given, then column names will serve as values for insertion
if (values.isEmpty())
{
QStringList valueList = wrapStrings(tableCols);
QStringList wrappedCols = wrapObjNamesIfNeeded(tableCols);
return tpl.arg(target, wrappedCols.join(", "), rowTpl.arg(valueList.join(", ")));
}
// Values were given. Sort given columns in order they are defined in table
QStringList valueCols = values.keys();
sortWithReferenceList(valueCols, tableCols);
// Group values into rows
QStringList valueSets = toValueSets(valueCols, values);
QString valueStr = rowTpl.arg(valueSets.join("), ("));
// Wrap given column names
QStringList wrappedCols = wrapObjNamesIfNeeded(valueCols);
return tpl.arg(target, wrappedCols.join(", "), valueStr);
}
QString QueryGenerator::generateUpdateOfTable(Db* db, const QString& table, const StrHash<QVariantList> values)
{
return generateUpdateOfTable(db, QString(), table, values);
}
QString QueryGenerator::generateUpdateOfTable(Db* db, const QString& database, const QString& table, StrHash<QVariantList> values)
{
static_qstring(tpl, "UPDATE %1 SET %2%3");
static_qstring(tplWithWhere, "UPDATE %1 SET %2 WHERE %3");
static_qstring(updateColTpl, "%1 = %2");
QString target = toFullObjectName(database, table);
// Get all columns of the table
SchemaResolver resolver(db);
QStringList tableCols = resolver.getTableColumns(database, table);
// Create list of "column = 'column'"
QStringList commonUpdateCols;
for (const QString& col : tableCols)
commonUpdateCols << updateColTpl.arg(wrapObjIfNeeded(col), wrapString(col));
// Put it to comma spearated string
QString commonColumnStr = commonUpdateCols.join(", ");
// If no values were given, we simply use column names as values everywhere
if (values.isEmpty())
{
QString conditionStr = commonUpdateCols.join(" AND ");
return tplWithWhere.arg(target, commonColumnStr, conditionStr);
}
// If values were given, then they will be used in WHERE clause
QStringList valueCols = values.keys();
sortWithReferenceList(valueCols, tableCols);
// Conditions for WHERE clause
QString conditionStr = valuesToConditionStr(values);
return tpl.arg(target, commonColumnStr, conditionStr);
}
QString QueryGenerator::generateDeleteFromTable(Db* db, const QString& table, const StrHash<QVariantList> values)
{
return generateDeleteFromTable(db, QString(), table, values);
}
QString QueryGenerator::generateDeleteFromTable(Db* db, const QString& database, const QString& table, StrHash<QVariantList> values)
{
static_qstring(tpl, "DELETE FROM %1%2");
static_qstring(tplWithWhere, "DELETE FROM %1 WHERE %2");
static_qstring(conditionColTpl, "%1 = %2");
QString target = toFullObjectName(database, table);
// Get all columns of the table
SchemaResolver resolver(db);
QStringList tableCols = resolver.getTableColumns(database, table);
// If no values were given, we simply use column names as values everywhere
if (values.isEmpty())
{
// Create list of "column = 'column'"
QStringList conditionCols;
for (const QString& col : tableCols)
conditionCols << conditionColTpl.arg(wrapObjIfNeeded(col), wrapString(col));
// Put it to comma spearated string
QString conditionStr = conditionCols.join(" AND ");
return tplWithWhere.arg(target, conditionStr);
}
// If values were given, then they will be used in WHERE clause
QStringList valueCols = values.keys();
sortWithReferenceList(valueCols, tableCols);
// Conditions for WHERE clause
QString conditionStr = valuesToConditionStr(values);
return tpl.arg(target, conditionStr);
}
QString QueryGenerator::generateSelectFromView(Db* db, const QString& view, const StrHash<QVariantList> values)
{
return generateSelectFromView(db, QString(), view, values);
}
QString QueryGenerator::generateSelectFromView(Db* db, const QString& database, const QString& view, const StrHash<QVariantList> values)
{
SchemaResolver resolver(db);
QStringList columns = resolver.getViewColumns(database, view);
return generateSelectFromTableOrView(db, database, view, columns, values);
}
QString QueryGenerator::generateSelectFromSelect(Db* db, const QString& initialSelect, const StrHash<QVariantList> values, const BiStrHash& dbNameToAttach)
{
static_qstring(tpl, "SELECT %1 FROM (%2)%3");
// Resolve all columns of the select
QList<SelectResolver::Column> columns = SelectResolver::sqliteResolveColumns(db, initialSelect, dbNameToAttach);
// Generate result columns
QStringList resCols;
for (const SelectResolver::Column& col : columns)
resCols << toResultColumnString(col);
// Generate conditions for WHERE clause
QString conditionStr = valuesToConditionStr(values);
return tpl.arg(resCols.join(", "), initialSelect, conditionStr);
}
QString QueryGenerator::generateSelectFromTableOrView(Db* db, const QString& database, const QString& tableOrView, const QStringList& columns, const StrHash<QVariantList> values)
{
UNUSED(db);
static_qstring(tpl, "SELECT %1 FROM %2%3");
QStringList wrappedCols = wrapObjNamesIfNeeded(columns);
QString target = toFullObjectName(database, tableOrView);
QString conditionStr = valuesToConditionStr(values);
return tpl.arg(wrappedCols.join(", "), target, conditionStr);
}
QString QueryGenerator::getAlias(const QString& name, QSet<QString>& usedAliases)
{
static_qstring(tpl, "%2%1");
QString letter;
if (name.length() == 0)
letter = "t";
else
letter = name[0];
QString alias = letter + "1";
int i = 2;
while (usedAliases.contains(alias))
alias = tpl.arg(i++).arg(letter);
usedAliases << alias;
return alias;
}
QStringList QueryGenerator::valuesToConditionList(const StrHash<QVariantList>& values)
{
static_qstring(conditionTpl0, "%1 IS NULL");
static_qstring(conditionTpl1, "%1 = %2");
static_qstring(conditionTpl2, "%1 IN (%2)");
QStringList conditions;
QStringList conditionValues;
for (const QString& col : values.keys())
{
conditionValues = valueListToSqlList(values[col]);
conditionValues.removeDuplicates();
if (conditionValues.size() == 1)
{
if (conditionValues.first() == "NULL")
conditions << conditionTpl0.arg(wrapObjIfNeeded(col));
else
conditions << conditionTpl1.arg(wrapObjIfNeeded(col), conditionValues.first());
}
else
conditions << conditionTpl2.arg(wrapObjIfNeeded(col), conditionValues.join(", "));
}
return conditions;
}
QString QueryGenerator::valuesToConditionStr(const StrHash<QVariantList>& values)
{
static_qstring(condTpl, " WHERE %1");
QStringList conditions = valuesToConditionList(values);
QString conditionStr = "";
if (conditions.size() > 0)
conditionStr = condTpl.arg(conditions.join(" AND "));
return conditionStr;
}
QString QueryGenerator::toResultColumnString(const SelectResolver::Column& column)
{
return wrapObjIfNeeded(column.displayName);
}
QString QueryGenerator::toFullObjectName(const QString& database, const QString& object)
{
static_qstring(tpl, "%1%2");
QString dbName = "";
if (!database.isEmpty() && dbName.toLower() != "main")
dbName = wrapObjIfNeeded(database);
if (!dbName.isEmpty())
dbName.append(".");
return tpl.arg(dbName, wrapObjIfNeeded(object));
}
QStringList QueryGenerator::toValueSets(const QStringList& columns, const StrHash<QVariantList> values)
{
QStringList rows;
QVariantList rowValues;
QStringList valueList;
for (int total = values.values().first().size(), i = 0; i < total; i++)
{
rowValues.clear();
for (const QString& col : columns)
rowValues << values[col][i];
valueList = valueListToSqlList(rowValues);
rows << valueList.join(", ");
}
return rows;
}
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