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annotate DBCache.hpp @ 23:5d14d8c2c299

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Fix to support other stringtypes than QString.
author Tom Fredrik Blenning Klaussen <bfg@blenning.no>
date Wed, 05 Sep 2012 21:56:06 +0200
parents 06166d6c083b
children bf3dce7fedcb
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1 #ifndef DBCACHE_HPP
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2 #define DBCACHE_HPP
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3
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4 #include <QtSql/QSqlDatabase>
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5 #include <QtSql/QSqlQuery>
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6 #include <QtSql/QSqlError>
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7 #include <QtSql/QSqlRecord>
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8
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9 #include <QtCore/QDebug>
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10 #include <QtCore/QStringList>
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11 #include <cassert>
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12 #include "OrderedPair.hpp"
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13
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14 #include <boost/optional.hpp>
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15
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16 #include "ThreadSafeLookup.hpp"
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17 #include "UniqueString.hpp"
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18
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19
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20 template<typename T>
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21 struct SQLGenerator
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22 {
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23 };
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24
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25 template<>
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26 struct SQLGenerator<int>
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27 {
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28 static QString fieldName(const QString &prefix = QString())
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29 {
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30 return QString("%1_Int").arg(prefix);
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31 }
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32
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33 static QString createFields(const QString &prefix = QString())
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34 {
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35 return QString("%1 INTEGER").arg(fieldName(prefix));
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36 }
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37
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38 static QString valueString(const QString &prefix = QString())
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39 {
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40 return QString(":") + fieldName(prefix);
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41 }
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42
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43 static void bindValue(QSqlQuery& query, int value, const QString& prefix = QString())
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44 {
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45 query.bindValue(valueString(prefix), value);
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46 }
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47
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48 static void bindValues(QSqlQuery& query, const QVariantList& values, const QString& prefix = QString())
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49 {
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50 query.bindValue(valueString(prefix), values);
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51 }
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52
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53 static void bindValues(QSqlQuery& query, const QList<int>& values, const QString& prefix = QString())
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54 {
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55 QVariantList list;
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56 foreach(int value, values) {
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57 list << value;
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58 }
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59 bindValues(query, list, prefix);
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60 }
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61
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62 static boost::optional<int> extract(QSqlQuery& query, const QString& prefix = QString())
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63 {
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64 int fieldNo = query.record().indexOf(fieldName(prefix));
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65 if (query.at() >= 0)
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66 return query.value(fieldNo).toInt();
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67 else
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68 return boost::optional<int>();
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69 }
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70
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71 };
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72
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73 template<>
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74 struct SQLGenerator<QString>
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75 {
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76 static QString fieldName(const QString &prefix = QString())
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77 {
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78 return QString("%1_QString").arg(prefix);
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79 }
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80
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81 static QString createFields(const QString &prefix = QString())
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82 {
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83 return QString("%1 TEXT").arg(fieldName(prefix));
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84 }
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85
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86 static QString valueString(const QString &prefix = QString())
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87 {
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88 return QString(":") + fieldName(prefix);
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89 }
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90
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91 static QString restrict(const QString &prefix = QString())
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92 {
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93 return QString("%1 = %2").arg(fieldName(prefix)).arg(valueString(prefix));
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94 }
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95
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96 static void bindValue(QSqlQuery& query, const QString& value, const QString& prefix = QString())
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97 {
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98 query.bindValue(valueString(prefix), value);
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99 }
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100
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101 static void bindValues(QSqlQuery& query, const QVariantList& value, const QString& prefix = QString())
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102 {
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103 query.bindValue(valueString(prefix), value);
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104 }
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105
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106 static void bindValues(QSqlQuery& query, const QList<QString>& values, const QString& prefix = QString())
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107 {
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108 QVariantList list;
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109 foreach(const QString& value, values) {
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110 list << value;
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111 }
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112 bindValues(query, list, prefix);
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113 }
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114
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115 static boost::optional<QString> extract(QSqlQuery& query, const QString& prefix = QString())
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116 {
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117 int fieldNo = query.record().indexOf(fieldName(prefix));
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118 if (query.at() >= 0)
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119 return query.value(fieldNo).toString();
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120 else
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121 return boost::optional<QString>();
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122 }
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123
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124
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125 };
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126
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127 template<>
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128 struct SQLGenerator<UniqueString>
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129 {
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130 static QString fieldName(const QString &prefix = QString())
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131 {
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132 return QString("%1_QString").arg(prefix);
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133 }
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134
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135 static QString createFields(const QString &prefix = QString())
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136 {
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137 return QString("%1 TEXT").arg(fieldName(prefix));
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138 }
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139
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140 static QString valueString(const QString &prefix = QString())
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141 {
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142 return QString(":") + fieldName(prefix);
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143 }
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144
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145 static QString restrict(const QString &prefix = QString())
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146 {
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147 return QString("%1 = %2").arg(fieldName(prefix)).arg(valueString(prefix));
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148 }
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149
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150 static void bindValue(QSqlQuery& query, const QString& value, const QString& prefix = QString())
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151 {
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152 query.bindValue(valueString(prefix), value);
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153 }
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154
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155 static void bindValues(QSqlQuery& query, const QVariantList& value, const QString& prefix = QString())
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156 {
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157 query.bindValue(valueString(prefix), value);
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158 }
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159
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160 static void bindValues(QSqlQuery& query, const QList<UniqueString>& values, const QString& prefix = QString())
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161 {
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162 QVariantList list;
23
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163 foreach(const UniqueString& value, values) {
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164 list << static_cast<const QString>(value);
16
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165 }
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166 bindValues(query, list, prefix);
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167 }
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168
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169 static boost::optional<QString> extract(QSqlQuery& query, const QString& prefix = QString())
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170 {
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171 int fieldNo = query.record().indexOf(fieldName(prefix));
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172 if (query.at() >= 0)
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173 return query.value(fieldNo).toString();
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174 else
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175 return boost::optional<QString>();
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176 }
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177
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178
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179 };
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180
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181 template<typename T>
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182 struct SQLGenerator<OrderedPair<T> >
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183 {
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184 static QString fieldName(const QString &prefix = QString())
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185 {
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186 return SQLGenerator<T>::fieldName(prefix + "_1") + ", " +
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187 SQLGenerator<T>::fieldName(prefix + "_2");
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188 }
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189
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190 static QString createFields(const QString &prefix = QString())
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191 {
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192 return SQLGenerator<T>::createFields(prefix + "_1") + ", " +
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193 SQLGenerator<T>::createFields(prefix + "_2");
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194 }
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195
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196 static QString restriction(const QString& prefix = QString())
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197 {
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198 return SQLGenerator<T>::restrict(prefix + "_1") + " AND " +
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199 SQLGenerator<T>::restrict(prefix + "_2");
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200 }
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201
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202 static QString valueString(const QString &prefix = QString())
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203 {
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204 return SQLGenerator<T>::valueString(prefix + "_1") + ", " +
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205 SQLGenerator<T>::valueString(prefix + "_2");
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206 }
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207
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208 static void bindValue(QSqlQuery& query, const OrderedPair<T>& value, const QString& prefix = QString())
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209 {
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210 SQLGenerator<T>::bindValue(query, value.first, prefix + "_1");
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211 SQLGenerator<T>::bindValue(query, value.second, prefix + "_2");
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212 }
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213
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214 static void bindValues(QSqlQuery& query, const QList<OrderedPair<T> >& values, const QString& prefix = QString())
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215 {
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216 QList<T> first;
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217 QList<T> second;
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218 foreach(OrderedPair<T> value, values) {
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219 first << value.first;
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220 second << value.second;
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221 }
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222 SQLGenerator<T>::bindValues(query, first, prefix + "_1");
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223 SQLGenerator<T>::bindValues(query, second, prefix + "_2");
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224 }
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225
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226 static boost::optional<OrderedPair<T> > extract(QSqlQuery& query, const QString& prefix = QString())
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227 {
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228 if (query.at() >= 0)
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229 return OrderedPair<T> (*SQLGenerator<T>::extract(query, prefix + "_1"),
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230 *SQLGenerator<T>::extract(query, prefix + "_2"));
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231 else
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232 return boost::optional<OrderedPair<T> >();
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233 }
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234
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235
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236 };
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237
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238 template<typename Key, typename Value, bool memoryMapped = false>
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239 class DBCache
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240 {
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241 private:
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242 ThreadSafeLookup<Key, Value> memoryMap;
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243 QList<Key> unsyncedKeys;
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244
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245 void setup(const QSqlDatabase& db, const QString& dictName)
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246 {
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247 this->dictName = dictName;
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248 if (!db.tables().contains(dictName)) {
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249 QString keyFields = SQLGenerator<Key>::createFields("key");
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250 QString valueFields = SQLGenerator<Value>::createFields("value");
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251 QString createQuery = QString("CREATE TABLE %1(%2, %3);").arg(dictName).arg(keyFields).arg(valueFields);
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252 QSqlQuery query(db);
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253 query.exec(createQuery);
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254 }
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255 if (!db.tables().contains(dictName)) {
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256 qDebug()<<"No database";
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257 exit(1);
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258 }
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259 if (memoryMapped) {
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260 QString keyFields = SQLGenerator<Key>::fieldName("key");
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261 QString valueFields = SQLGenerator<Value>::fieldName("value");
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262 QString repopulateQuery = QString("SELECT %1, %2 FROM %3;").arg(keyFields).arg(valueFields).arg(dictName);
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diff changeset
263 QSqlQuery query(db);
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diff changeset
264 if (!query.exec(repopulateQuery)) {
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265 qDebug() << query.lastError() << repopulateQuery;
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266 }
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diff changeset
267 while (query.next()) {
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268 Key key = *SQLGenerator<Key>::extract(query, "key");
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269 Value value = *SQLGenerator<Value>::extract(query, "value");
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270 memoryMap.insert(key, value);
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271 }
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272 }
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273 QString queryString = QString("INSERT into %1 (%2, %3) VALUES(%4, %5);")
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274 .arg(dictName)
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275 .arg(SQLGenerator<Key>::fieldName("key"))
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276 .arg(SQLGenerator<Value>::fieldName("value"))
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277 .arg(SQLGenerator<Key>::valueString("key"))
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278 .arg(SQLGenerator<Value>::valueString("value"));
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279 insertQuery = QSqlQuery(db);
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280 insertQuery.prepare(queryString);
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281 }
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282
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diff changeset
283 void syncInsert()
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diff changeset
284 {
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diff changeset
285 SQLGenerator<Key>::bindValues(insertQuery, unsyncedKeys, "key");
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diff changeset
286 QList<Value> values;
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diff changeset
287 foreach(Key key, unsyncedKeys) {
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diff changeset
288 values << *memoryMap.value(key);
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289 }
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diff changeset
290 SQLGenerator<Value>::bindValues(insertQuery, values, "value");
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diff changeset
291 if (!insertQuery.exec()) {
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diff changeset
292 qDebug() << insertQuery.lastError() << insertQuery.lastQuery();
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293 }
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diff changeset
294 insertQuery.finish();
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295 unsyncedKeys.clear();
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296 }
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297
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298 public:
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299 DBCache(const QString& dbName, const QString& dictName)
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diff changeset
300 {
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Tom Fredrik Blenning Klaussen <bfg@blenning.no>
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diff changeset
301 db = QSqlDatabase::addDatabase("QSQLITE", "dictName");
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diff changeset
302 db.setDatabaseName(dbName);
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diff changeset
303 bool ok = db.open();
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Tom Fredrik Blenning Klaussen <bfg@blenning.no>
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diff changeset
304 assert(ok);
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Tom Fredrik Blenning Klaussen <bfg@blenning.no>
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diff changeset
305 setup(db, dictName);
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306 }
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307
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308 DBCache(const QSqlDatabase& db, const QString& dictName)
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309 {
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310 setup(db, dictName);
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311 }
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312
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313 boost::optional<Value> value(const Key& key) const
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314 {
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315 if (memoryMapped) {
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316 return memoryMap.value(key);
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317 }
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318 else {
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319 QString queryString = QString("SELECT %1 FROM %2 WHERE %3")
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320 .arg(SQLGenerator<Value>::fieldName("value"))
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321 .arg(dictName)
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322 .arg(SQLGenerator<Key>::restriction("key"));
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323 QSqlQuery query(db);
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324 query.prepare(queryString);
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325 SQLGenerator<Key>::bindValue(query, key, "key");
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326 if (!query.exec()) {
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327 qDebug() << query.lastError() << queryString;
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328 }
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329 query.next();
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330 return SQLGenerator<Value>::extract(query, "value");
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331 }
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332 }
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333
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334 void insert(const Key& key, const Value& value)
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335 {
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336 if (memoryMapped) {
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337 memoryMap.insert(key, value);
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338 unsyncedKeys.append(key);
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339 if (unsyncedKeys.size() > 1024) {
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340 syncInsert();
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341 }
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342 }
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343 else {
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344 SQLGenerator<Key>::bindValue(insertQuery, key, "key");
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345 SQLGenerator<Value>::bindValue(insertQuery, value, "value");
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346 if (!insertQuery.exec()) {
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347 qDebug() << insertQuery.lastError() << insertQuery.lastQuery();
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348 }
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349 insertQuery.finish();
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350 }
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351
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352 }
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353
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354 private:
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355 QSqlDatabase db;
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356 QString dictName;
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357 QSqlQuery insertQuery;
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358 };
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359
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360 #endif //DBCACHE_HPP