5 // Copyright (c) 2007-2008 Jiri Moudry, Pascal Craponne
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7 // Permission is hereby granted, free of charge, to any person obtaining a copy
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8 // of this software and associated documentation files (the "Software"), to deal
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9 // in the Software without restriction, including without limitation the rights
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10 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 // copies of the Software, and to permit persons to whom the Software is
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12 // furnished to do so, subject to the following conditions:
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14 // The above copyright notice and this permission notice shall be included in
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15 // all copies or substantial portions of the Software.
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17 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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29 using System.Collections.Generic;
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31 using DbLinq.Vendor.Implementation;
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34 using System.Data.Linq.Sql;
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35 using System.Data.Linq.Sugar.Expressions;
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37 using DbLinq.Data.Linq.Sql;
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38 using DbLinq.Data.Linq.Sugar.Expressions;
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41 namespace DbLinq.SqlServer
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48 class SqlServerSqlProvider : SqlProvider
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50 public override ExpressionTranslator GetTranslator()
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52 return new SqlServerExpressionTranslator();
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55 protected override char SafeNameStartQuote { get { return '['; } }
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56 protected override char SafeNameEndQuote { get { return ']'; } }
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59 /// Returns a table alias
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60 /// Ensures about the right case
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62 /// <param name="table"></param>
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63 /// <param name="alias"></param>
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64 /// <returns></returns>
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65 public override string GetTableAsAlias(string table, string alias)
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67 return string.Format("{0} AS {1}", GetTable(table), GetTableAlias(alias));
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70 public override SqlStatement GetLiteral(bool literal)
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77 public override string GetParameterName(string nameBase)
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79 return string.Format("@{0}", nameBase);
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82 public override SqlStatement GetLiteralLimit(SqlStatement select, SqlStatement limit)
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84 var trimSelect = "SELECT ";
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85 if (select.Count > 0 && select[0].Sql.StartsWith(trimSelect))
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87 var selectBuilder = new SqlStatementBuilder(select);
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88 var remaining = select[0].Sql.Substring(trimSelect.Length);
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89 selectBuilder.Parts[0] = new SqlLiteralPart(remaining);
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90 return SqlStatement.Format("SELECT TOP ({0}) {1}", limit, selectBuilder.ToSqlStatement());
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92 throw new ArgumentException("S0051: Unknown select format");
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95 public override SqlStatement GetLiteralLimit(SqlStatement select, SqlStatement limit, SqlStatement offset, SqlStatement offsetAndLimit)
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98 var orderBy = "ORDER BY ";
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99 var selectK = "SELECT ";
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100 int fromIdx = select[0].Sql.IndexOf(from);
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101 int orderByIdx = select[0].Sql.IndexOf(orderBy);
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104 throw new ArgumentException("S0051: Unknown select format: " + select[0].Sql);
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106 string orderByClause = null;
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107 string sourceClause = null;
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108 if (orderByIdx >= 0)
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110 orderByClause = select[0].Sql.Substring(orderByIdx);
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111 sourceClause = select[0].Sql.Substring(fromIdx, orderByIdx - fromIdx);
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115 orderByClause = "ORDER BY " + select[0].Sql.Substring(selectK.Length, fromIdx - selectK.Length);
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116 sourceClause = select[0].Sql.Substring(fromIdx);
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119 var selectFieldsClause = select[0].Sql.Substring(0, fromIdx);
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121 return SqlStatement.Format(
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125 " ROW_NUMBER() OVER({2}) AS [__ROW_NUMBER]{0}" +
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128 "WHERE [__ROW_NUMBER] BETWEEN {4}+1 AND {4}+{5}{0}" +
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129 "ORDER BY [__ROW_NUMBER]",
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130 NewLine, selectFieldsClause, orderByClause, sourceClause, offset, limit);
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133 protected override SqlStatement GetLiteralDateDiff(SqlStatement dateA, SqlStatement dateB)
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135 return SqlStatement.Format("(CONVERT(BigInt,DATEDIFF(DAY, {0}, {1}))) * 86400000 +" //diffierence in milliseconds regards days
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136 + "DATEDIFF(MILLISECOND, "
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138 // (DateA-DateB) in days +DateB = difference in time
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140 DATEDIFF(DAY, {0}, {1})
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143 + ",{1})", dateB, dateA);
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145 //this trick is needed in sqlserver since DATEDIFF(MILLISECONDS,{0},{1}) usually crhases in the database engine due an overflow:
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146 //System.Data.SqlClient.SqlException : Difference of two datetime columns caused overflow at runtime.
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149 protected override SqlStatement GetLiteralDateTimePart(SqlStatement dateExpression, SpecialExpressionType operationType)
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151 return SqlStatement.Format("DATEPART({0},{1})", operationType.ToString().ToUpper(), dateExpression);
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154 protected override SqlStatement GetLiteralMathPow(SqlStatement p, SqlStatement p_2)
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156 return SqlStatement.Format("POWER({0},{1})", p, p_2);
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159 protected override SqlStatement GetLiteralMathLog(SqlStatement p, SqlStatement p_2)
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161 return SqlStatement.Format("(LOG({0})/LOG({1}))", p, p_2);
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164 protected override SqlStatement GetLiteralMathLn(SqlStatement p)
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166 return GetLiteralMathLog(p, string.Format("{0}", Math.E));
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169 protected override SqlStatement GetLiteralStringLength(SqlStatement a)
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171 return SqlStatement.Format("LEN({0})", a);
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174 protected override SqlStatement GetLiteralSubString(SqlStatement baseString, SqlStatement startIndex, SqlStatement count)
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176 //in standard sql base string index is 1 instead 0
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177 return SqlStatement.Format("SUBSTRING({0}, {1}, {2})", baseString, startIndex, count);
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180 protected override SqlStatement GetLiteralSubString(SqlStatement baseString, SqlStatement startIndex)
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182 return GetLiteralSubString(baseString, startIndex, GetLiteralStringLength(baseString));
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185 protected override SqlStatement GetLiteralTrim(SqlStatement a)
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187 return SqlStatement.Format("RTRIM(LTRIM({0}))", a);
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190 protected override SqlStatement GetLiteralStringConcat(SqlStatement a, SqlStatement b)
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192 return SqlStatement.Format("{0} + {1}", a, b);
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195 protected override SqlStatement GetLiteralStringToLower(SqlStatement a)
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197 return SqlStatement.Format("LOWER({0})", a);
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200 protected override SqlStatement GetLiteralStringToUpper(SqlStatement a)
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202 return SqlStatement.Format("UPPER({0})", a);
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205 protected override SqlStatement GetLiteralStringIndexOf(SqlStatement baseString, SqlStatement searchString)
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207 return GetLiteralSubtract(SqlStatement.Format("CHARINDEX({0},{1})", searchString, baseString), "1");
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210 protected override SqlStatement GetLiteralStringIndexOf(SqlStatement baseString, SqlStatement searchString, SqlStatement startIndex)
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212 return GetLiteralSubtract(SqlStatement.Format("CHARINDEX({0},{1},{2})", searchString, baseString, startIndex), "1");
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215 protected override SqlStatement GetLiteralStringIndexOf(SqlStatement baseString, SqlStatement searchString, SqlStatement startIndex, SqlStatement count)
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217 return GetLiteralSubtract(SqlStatement.Format("CHARINDEX({0},{1},{2})", searchString, GetLiteralSubString(baseString, "1", GetLiteralStringConcat(count, startIndex)), startIndex), "1");
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220 //http://msdn.microsoft.com/en-us/library/4e5xt97a(VS.71).aspx
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221 public static readonly Dictionary<Type, string> typeMapping = new Dictionary<Type, string>
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223 {typeof(int),"int"},
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224 {typeof(uint),"int"},
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226 {typeof(long),"bigint"},
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227 {typeof(ulong),"bigint"},
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229 {typeof(float),"float"}, //TODO: could be float or real. check ranges.
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230 {typeof(double),"float"}, //TODO: could be float or real. check ranges.
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232 {typeof(decimal),"numeric"},
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234 {typeof(short),"tinyint"},
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235 {typeof(ushort),"tinyint"},
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237 {typeof(bool),"bit"},
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239 // trunk? They could be: varchar, char,nchar, ntext,text... it should be the most flexible string type. TODO: check wich of them is better.
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240 {typeof(string),"varchar"},
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241 {typeof(char[]),"varchar"},
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243 {typeof(char),"char"},
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245 {typeof(DateTime),"datetime"},
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246 {typeof(Guid),"uniqueidentifier"}
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248 // there are more types: timestamps, images ... TODO: check what is the official behaviour
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251 public override SqlStatement GetLiteralConvert(SqlStatement a, Type type)
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253 if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>))
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254 type = type.GetGenericArguments().First();
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256 SqlStatement sqlTypeName;
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257 if (typeMapping.ContainsKey(type))
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258 sqlTypeName = typeMapping[type];
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260 sqlTypeName = "variant";
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262 return SqlStatement.Format("CONVERT({0},{1})", sqlTypeName, a);
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265 public override string GetColumn(string table, string column)
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268 return base.GetColumn(table, column);
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