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annotate DBCache.hpp @ 31:bf3dce7fedcb

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Remove all references to QDebug
author Tom Fredrik Blenning Klaussen <bfg@blenning.no>
date Thu, 06 Sep 2012 19:14:58 +0200
parents 5d14d8c2c299
children c978d4a6514d
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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
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10 #include <QtCore/QStringList>
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11 #include <QtCore/QVariant>
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12 #include <cassert>
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13 #include "OrderedPair.hpp"
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14
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15 #include <boost/optional.hpp>
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16
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17 #include "ThreadSafeLookup.hpp"
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18 #include "UniqueString.hpp"
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19 #include "Exception/SQLException.hpp"
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20
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21
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22 template<typename T>
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23 struct SQLGenerator
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24 {
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25 };
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26
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27 template<>
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28 struct SQLGenerator<int>
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29 {
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30 static QString fieldName(const QString &prefix = QString())
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31 {
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32 return QString("%1_Int").arg(prefix);
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33 }
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34
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35 static QString createFields(const QString &prefix = QString())
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36 {
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37 return QString("%1 INTEGER").arg(fieldName(prefix));
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38 }
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39
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40 static QString valueString(const QString &prefix = QString())
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41 {
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42 return QString(":") + fieldName(prefix);
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43 }
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44
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45 static void bindValue(QSqlQuery& query, int value, const QString& prefix = QString())
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46 {
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47 query.bindValue(valueString(prefix), value);
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48 }
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49
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50 static void bindValues(QSqlQuery& query, const QVariantList& values, const QString& prefix = QString())
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51 {
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52 query.bindValue(valueString(prefix), values);
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53 }
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54
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55 static void bindValues(QSqlQuery& query, const QList<int>& values, const QString& prefix = QString())
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56 {
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57 QVariantList list;
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58 foreach(int value, values) {
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59 list << value;
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60 }
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61 bindValues(query, list, prefix);
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62 }
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63
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64 static boost::optional<int> extract(QSqlQuery& query, const QString& prefix = QString())
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65 {
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66 int fieldNo = query.record().indexOf(fieldName(prefix));
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67 if (query.at() >= 0)
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68 return query.value(fieldNo).toInt();
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69 else
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70 return boost::optional<int>();
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71 }
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72
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73 };
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74
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75 template<>
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76 struct SQLGenerator<QString>
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77 {
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78 static QString fieldName(const QString &prefix = QString())
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79 {
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80 return QString("%1_QString").arg(prefix);
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81 }
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82
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83 static QString createFields(const QString &prefix = QString())
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84 {
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85 return QString("%1 TEXT").arg(fieldName(prefix));
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86 }
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87
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88 static QString valueString(const QString &prefix = QString())
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89 {
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90 return QString(":") + fieldName(prefix);
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91 }
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92
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93 static QString restrict(const QString &prefix = QString())
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94 {
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95 return QString("%1 = %2").arg(fieldName(prefix)).arg(valueString(prefix));
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96 }
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97
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98 static void bindValue(QSqlQuery& query, const QString& value, const QString& prefix = QString())
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99 {
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100 query.bindValue(valueString(prefix), value);
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101 }
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102
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103 static void bindValues(QSqlQuery& query, const QVariantList& value, const QString& prefix = QString())
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104 {
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105 query.bindValue(valueString(prefix), value);
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106 }
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107
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108 static void bindValues(QSqlQuery& query, const QList<QString>& values, const QString& prefix = QString())
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109 {
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110 QVariantList list;
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111 foreach(const QString& value, values) {
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112 list << value;
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113 }
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114 bindValues(query, list, prefix);
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115 }
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116
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117 static boost::optional<QString> extract(QSqlQuery& query, const QString& prefix = QString())
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118 {
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119 int fieldNo = query.record().indexOf(fieldName(prefix));
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120 if (query.at() >= 0)
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121 return query.value(fieldNo).toString();
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122 else
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123 return boost::optional<QString>();
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124 }
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125
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126
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127 };
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128
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129 template<>
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130 struct SQLGenerator<UniqueString>
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131 {
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132 static QString fieldName(const QString &prefix = QString())
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133 {
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134 return QString("%1_QString").arg(prefix);
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135 }
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136
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137 static QString createFields(const QString &prefix = QString())
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138 {
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139 return QString("%1 TEXT").arg(fieldName(prefix));
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140 }
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141
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142 static QString valueString(const QString &prefix = QString())
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143 {
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144 return QString(":") + fieldName(prefix);
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145 }
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146
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147 static QString restrict(const QString &prefix = QString())
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148 {
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149 return QString("%1 = %2").arg(fieldName(prefix)).arg(valueString(prefix));
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150 }
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151
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152 static void bindValue(QSqlQuery& query, const QString& value, const QString& prefix = QString())
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153 {
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154 query.bindValue(valueString(prefix), value);
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155 }
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156
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157 static void bindValues(QSqlQuery& query, const QVariantList& value, const QString& prefix = QString())
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158 {
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159 query.bindValue(valueString(prefix), value);
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160 }
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161
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162 static void bindValues(QSqlQuery& query, const QList<UniqueString>& values, const QString& prefix = QString())
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163 {
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164 QVariantList list;
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165 foreach(const UniqueString& value, values) {
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166 list << static_cast<const QString>(value);
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167 }
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168 bindValues(query, list, prefix);
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169 }
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170
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171 static boost::optional<QString> extract(QSqlQuery& query, const QString& prefix = QString())
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172 {
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173 int fieldNo = query.record().indexOf(fieldName(prefix));
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174 if (query.at() >= 0)
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175 return query.value(fieldNo).toString();
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176 else
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177 return boost::optional<QString>();
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178 }
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179
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180
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181 };
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182
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183 template<typename T>
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184 struct SQLGenerator<OrderedPair<T> >
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185 {
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186 static QString fieldName(const QString &prefix = QString())
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187 {
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188 return SQLGenerator<T>::fieldName(prefix + "_1") + ", " +
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189 SQLGenerator<T>::fieldName(prefix + "_2");
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190 }
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191
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192 static QString createFields(const QString &prefix = QString())
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193 {
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194 return SQLGenerator<T>::createFields(prefix + "_1") + ", " +
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195 SQLGenerator<T>::createFields(prefix + "_2");
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196 }
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197
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198 static QString restriction(const QString& prefix = QString())
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199 {
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200 return SQLGenerator<T>::restrict(prefix + "_1") + " AND " +
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201 SQLGenerator<T>::restrict(prefix + "_2");
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202 }
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203
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204 static QString valueString(const QString &prefix = QString())
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205 {
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206 return SQLGenerator<T>::valueString(prefix + "_1") + ", " +
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207 SQLGenerator<T>::valueString(prefix + "_2");
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208 }
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209
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210 static void bindValue(QSqlQuery& query, const OrderedPair<T>& value, const QString& prefix = QString())
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211 {
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212 SQLGenerator<T>::bindValue(query, value.first, prefix + "_1");
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213 SQLGenerator<T>::bindValue(query, value.second, prefix + "_2");
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214 }
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215
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216 static void bindValues(QSqlQuery& query, const QList<OrderedPair<T> >& values, const QString& prefix = QString())
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217 {
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218 QList<T> first;
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219 QList<T> second;
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220 foreach(OrderedPair<T> value, values) {
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221 first << value.first;
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222 second << value.second;
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223 }
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224 SQLGenerator<T>::bindValues(query, first, prefix + "_1");
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225 SQLGenerator<T>::bindValues(query, second, prefix + "_2");
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226 }
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227
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228 static boost::optional<OrderedPair<T> > extract(QSqlQuery& query, const QString& prefix = QString())
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229 {
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230 if (query.at() >= 0)
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231 return OrderedPair<T> (*SQLGenerator<T>::extract(query, prefix + "_1"),
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232 *SQLGenerator<T>::extract(query, prefix + "_2"));
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233 else
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234 return boost::optional<OrderedPair<T> >();
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235 }
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236
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237
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238 };
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239
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240 template<typename Key, typename Value, bool memoryMapped = false>
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241 class DBCache
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242 {
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243 private:
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244 ThreadSafeLookup<Key, Value> memoryMap;
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245 QList<Key> unsyncedKeys;
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246
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247 void setup(const QSqlDatabase& db, const QString& dictName)
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248 {
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249 this->dictName = dictName;
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250 if (!db.tables().contains(dictName)) {
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251 QString keyFields = SQLGenerator<Key>::createFields("key");
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252 QString valueFields = SQLGenerator<Value>::createFields("value");
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253 QString createQuery = QString("CREATE TABLE %1(%2, %3);").arg(dictName).arg(keyFields).arg(valueFields);
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254 QSqlQuery query(db);
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255 query.exec(createQuery);
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256 }
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257 if (!db.tables().contains(dictName)) {
31
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258 throw SQLException("No databaase");
16
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259 }
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260 if (memoryMapped) {
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261 QString keyFields = SQLGenerator<Key>::fieldName("key");
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262 QString valueFields = SQLGenerator<Value>::fieldName("value");
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263 QString repopulateQuery = QString("SELECT %1, %2 FROM %3;").arg(keyFields).arg(valueFields).arg(dictName);
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264 QSqlQuery query(db);
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265 if (!query.exec(repopulateQuery)) {
31
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266 throw SQLException(query);
16
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267 }
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268 while (query.next()) {
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269 Key key = *SQLGenerator<Key>::extract(query, "key");
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270 Value value = *SQLGenerator<Value>::extract(query, "value");
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271 memoryMap.insert(key, value);
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272 }
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273 }
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274 QString queryString = QString("INSERT into %1 (%2, %3) VALUES(%4, %5);")
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275 .arg(dictName)
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276 .arg(SQLGenerator<Key>::fieldName("key"))
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277 .arg(SQLGenerator<Value>::fieldName("value"))
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278 .arg(SQLGenerator<Key>::valueString("key"))
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279 .arg(SQLGenerator<Value>::valueString("value"));
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280 insertQuery = QSqlQuery(db);
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281 insertQuery.prepare(queryString);
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282 }
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283
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284 void syncInsert()
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285 {
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286 SQLGenerator<Key>::bindValues(insertQuery, unsyncedKeys, "key");
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287 QList<Value> values;
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288 foreach(Key key, unsyncedKeys) {
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289 values << *memoryMap.value(key);
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290 }
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291 SQLGenerator<Value>::bindValues(insertQuery, values, "value");
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292 if (!insertQuery.exec()) {
31
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293 throw SQLException(insertQuery);
16
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294 }
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295 insertQuery.finish();
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296 unsyncedKeys.clear();
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297 }
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298
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299 public:
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300 DBCache(const QString& dbName, const QString& dictName)
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301 {
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302 db = QSqlDatabase::addDatabase("QSQLITE", "dictName");
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303 db.setDatabaseName(dbName);
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diff changeset
304 bool ok = db.open();
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305 assert(ok);
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306 setup(db, dictName);
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307 }
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308
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309 DBCache(const QSqlDatabase& db, const QString& dictName)
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310 {
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311 setup(db, dictName);
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312 }
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313
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314 boost::optional<Value> value(const Key& key) const
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315 {
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316 if (memoryMapped) {
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317 return memoryMap.value(key);
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318 }
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319 else {
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320 QString queryString = QString("SELECT %1 FROM %2 WHERE %3")
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321 .arg(SQLGenerator<Value>::fieldName("value"))
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322 .arg(dictName)
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323 .arg(SQLGenerator<Key>::restriction("key"));
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324 QSqlQuery query(db);
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325 query.prepare(queryString);
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326 SQLGenerator<Key>::bindValue(query, key, "key");
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327 if (!query.exec()) {
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328 throw SQLException(query);
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329 }
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330 query.next();
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331 return SQLGenerator<Value>::extract(query, "value");
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332 }
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333 }
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334
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335 void insert(const Key& key, const Value& value)
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336 {
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337 if (memoryMapped) {
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338 memoryMap.insert(key, value);
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339 unsyncedKeys.append(key);
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340 if (unsyncedKeys.size() > 1024) {
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341 syncInsert();
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342 }
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343 }
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344 else {
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345 SQLGenerator<Key>::bindValue(insertQuery, key, "key");
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346 SQLGenerator<Value>::bindValue(insertQuery, value, "value");
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347 if (!insertQuery.exec()) {
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348 throw SQLException(insertQuery);
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349 }
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350 insertQuery.finish();
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351 }
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352
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353 }
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354
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355 private:
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356 QSqlDatabase db;
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357 QString dictName;
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358 QSqlQuery insertQuery;
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359 };
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360
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361 #endif //DBCACHE_HPP