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1 // Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // SQL Literal value and node classes |
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15 // |
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16 // |
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17 |
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18 #include "UQ_STD.H" |
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19 |
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20 // internalising literal strings, overload selectors |
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21 |
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22 inline HBufC8* Alloc8L(const TDesC8& aDes) |
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23 {return aDes.AllocL();} |
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24 inline HBufC8* Alloc8L(const TDesC16& aDes) |
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25 {HBufC8* cell=HBufC8::NewL(aDes.Length());cell->Des().Copy(aDes);return cell;} |
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26 inline HBufC16* Alloc16L(const TDesC16& aDes) |
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27 {return aDes.AllocL();} |
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28 inline HBufC16* Alloc16L(const TDesC8& aDes) |
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29 {HBufC16* cell=HBufC16::NewL(aDes.Length());cell->Des().Copy(aDes);return cell;} |
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30 |
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31 template <class B,class T> |
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32 inline B* DoInternString(B* aBuf,T*) |
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33 { |
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34 const T* base=aBuf->Ptr(); |
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35 const T* from=base; |
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36 const T* end=base+aBuf->Length(); |
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37 for (;;) |
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38 { |
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39 if (from==end) |
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40 return aBuf; |
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41 if (*from++=='\'') |
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42 break; |
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43 } |
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44 T* to=(T*)from; |
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45 ++from; |
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46 while (from<end) |
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47 { |
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48 T c=*from++; |
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49 if (c=='\'') |
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50 ++from; |
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51 *to++=c; |
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52 } |
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53 aBuf->Des().SetLength(to-base); |
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54 return aBuf; |
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55 } |
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56 |
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57 template <class B> |
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58 inline B* InternString(B* aBuf) |
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59 {return DoInternString(aBuf,PtrType(*aBuf));} |
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60 |
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61 // Class RSqlLiteral |
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62 |
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63 void RSqlLiteral::Close() |
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64 // |
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65 // Free any allocated cell |
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66 // |
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67 { |
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68 if(iBuffer) |
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69 delete iBuffer; |
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70 if (IsAlloc()) |
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71 User::Free(iVal.iAlloc); |
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72 |
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73 |
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74 } |
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75 |
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76 void RSqlLiteral::ToInt32L() |
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77 // |
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78 // Convert a numeric type to Int32 |
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79 // |
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80 { |
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81 ToInt64L(); |
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82 const TInt64& v=iVal.iInt64; |
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83 TInt32 l = I64LOW(v); |
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84 TInt32 h = I64HIGH(v); |
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85 if (h==(l>>31)) // domain check, in signed 32-bit range |
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86 { |
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87 iVal.iInt32=l; |
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88 iType=EInt32; |
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89 } |
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90 else |
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91 __LEAVE(KErrOverflow); // cannot convert |
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92 } |
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93 |
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94 void RSqlLiteral::ToUint32L() |
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95 // |
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96 // Convert a numeric type to Uint32 |
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97 // |
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98 { |
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99 ToInt64L(); |
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100 const TInt64& v=iVal.iInt64; |
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101 if (I64HIGH(v)==0) // domain check, in unsigned 32-bit range |
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102 { |
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103 iVal.iUint32 = I64LOW(v); |
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104 iType=EUint32; |
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105 } |
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106 else |
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107 __LEAVE(KErrOverflow); // cannot convert |
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108 } |
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109 |
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110 void RSqlLiteral::ToInt64L() |
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111 // |
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112 // Convert a numeric type to int64 |
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113 // |
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114 { |
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115 __ASSERT(IsBasic()); // only apply conversions once |
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116 TType t=iType; |
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117 if (t==EReal64) |
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118 { |
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119 iVal.iInt64() = static_cast<TInt64>(Real64()); |
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120 iType=EInt64; |
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121 } |
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122 else if (t!=EInt64) |
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123 __LEAVE(KErrGeneral); |
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124 } |
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125 |
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126 void RSqlLiteral::ToReal64L() |
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127 // |
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128 // Convert a numeric type to real64 |
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129 // |
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130 { |
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131 __ASSERT(IsBasic()); // only apply conversions once |
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132 TType t=iType; |
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133 if (t==EInt64) |
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134 { |
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135 iVal.iReal64=I64REAL(Int64()); |
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136 iType=EReal64; |
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137 } |
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138 else if (t!=EReal64) |
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139 __LEAVE(KErrGeneral); |
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140 } |
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141 |
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142 void RSqlLiteral::ToReal32L() |
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143 // |
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144 // Convert a numeric type to real32 |
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145 // |
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146 { |
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147 ToReal64L(); |
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148 __LEAVE_IF_ERROR(TRealX(iVal.iReal64).GetTReal(iVal.iReal32)); |
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149 iType=EReal32; |
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150 } |
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151 |
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152 void RSqlLiteral::ToTimeL() |
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153 // |
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154 // Ensure we are a time |
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155 // |
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156 { |
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157 __ASSERT(IsBasic()); // only apply conversions once |
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158 if (iType!=ETime) |
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159 __LEAVE(KErrGeneral); // type mismatch |
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160 } |
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161 |
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162 void RSqlLiteral::ToText8L() |
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163 // |
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164 // Convert a ptr to a text8 |
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165 // |
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166 { |
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167 __ASSERT(IsBasic()); // only apply conversions once |
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168 if (iType==EPtr) |
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169 { |
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170 iVal.iAlloc=InternString(Alloc8L(DesC())); |
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171 iType=EBuf8; |
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172 } |
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173 else |
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174 __LEAVE(KErrGeneral); // type mismatch |
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175 } |
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176 |
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177 void RSqlLiteral::ToText16L() |
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178 // |
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179 // Convert a ptr to a text8 |
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180 // |
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181 { |
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182 __ASSERT(IsBasic()); // only apply conversions once |
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183 if (iType==EPtr) |
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184 { |
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185 iVal.iAlloc=InternString(Alloc16L(DesC())); |
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186 iType=EBuf16; |
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187 } |
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188 else |
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189 __LEAVE(KErrGeneral); // type mismatch |
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190 } |
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191 |
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192 |
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193 |
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194 // class CSqlLiteralNode |
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195 |
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196 CSqlLiteralNode::CSqlLiteralNode(TType aType,const TDesC& aColumn,const RSqlLiteral& aLiteral) |
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197 :CSqlBoundNode(aType,aColumn),iLiteral(aLiteral) |
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198 {} |
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199 |
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200 CSqlLiteralNode::~CSqlLiteralNode() |
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201 { |
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202 iLiteral.Close(); |
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203 } |
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204 |
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205 void CSqlLiteralNode::BindL(const RDbTableRow& aSource) |
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206 { |
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207 CSqlBoundNode::BindL(aSource); |
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208 switch (ColType()) |
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209 { |
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210 default: // type not allowed in evaluation expressions |
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211 __LEAVE(KErrGeneral); |
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212 break; |
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213 case EDbColBit: |
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214 case EDbColInt8: |
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215 case EDbColUint8: |
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216 case EDbColInt16: |
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217 case EDbColUint16: |
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218 case EDbColInt32: |
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219 case EDbColUint32: |
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220 case EDbColInt64: |
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221 iLiteral.ToInt64L(); |
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222 break; |
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223 case EDbColReal32: |
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224 case EDbColReal64: |
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225 iLiteral.ToReal64L(); |
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226 break; |
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227 case EDbColDateTime: |
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228 iLiteral.ToTimeL(); |
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229 break; |
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230 case EDbColText8: |
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231 case EDbColLongText8: |
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232 iLiteral.ToText8L(); |
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233 break; |
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234 case EDbColText16: |
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235 case EDbColLongText16: |
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236 iLiteral.ToText16L(); |
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237 break; |
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238 } |
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239 } |
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240 // copy text to buffer for LIKE Escape support |
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241 TInt RSqlLiteral::CopyText() |
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242 { |
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243 if (iType==EPtr) |
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244 { |
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245 TInt length = iVal.iPtr.iEnd - iVal.iPtr.iPtr; |
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246 if(iBuffer) |
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247 delete iBuffer; |
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248 if((iBuffer=HBufC::New(length+1)) == NULL) |
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249 { |
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250 return KErrNoMemory; |
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251 } |
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252 iBuffer->Des().Copy(iVal.iPtr.iPtr,length); |
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253 iVal.iPtr.iPtr= &iBuffer->Des()[0]; |
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254 iBuffer->Des().Append(iVal.iPtr.iEnd,1); |
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255 iVal.iPtr.iEnd=&iBuffer->Des()[length]; |
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256 } |
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257 else |
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258 return KErrGeneral; // type mismatch |
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259 return KErrNone; |
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260 } |
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261 |