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FreeSql/FreeSql/Sqlite/SqliteExpression.cs
28810 5d734052df - 优化 实体数据属性 DbDefaultValue 处理； 
- 修复 Expression 表达式解析 Convert 的判断 bug；
2019-05-24 18:11:27 +08:00

404 lines
20 KiB
C#
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using FreeSql.Internal;
using FreeSql.Internal.Model;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
namespace FreeSql.Sqlite {
class SqliteExpression : CommonExpression {
public SqliteExpression(CommonUtils common) : base(common) { }
internal override string ExpressionLambdaToSqlOther(Expression exp, ExpTSC tsc) {
Func<Expression, string> getExp = exparg => ExpressionLambdaToSql(exparg, tsc);
switch (exp.NodeType) {
case ExpressionType.Convert:
var operandExp = (exp as UnaryExpression)?.Operand;
var gentype = exp.Type.NullableTypeOrThis();
if (gentype != operandExp.Type.NullableTypeOrThis()) {
switch (exp.Type.NullableTypeOrThis().ToString()) {
case "System.Boolean": return $"({getExp(operandExp)} not in ('0','false'))";
case "System.Byte": return $"cast({getExp(operandExp)} as int2)";
case "System.Char": return $"substr(cast({getExp(operandExp)} as character), 1, 1)";
case "System.DateTime": return $"datetime({getExp(operandExp)})";
case "System.Decimal": return $"cast({getExp(operandExp)} as decimal(36,18))";
case "System.Double": return $"cast({getExp(operandExp)} as double)";
case "System.Int16":
case "System.Int32":
case "System.Int64":
case "System.SByte": return $"cast({getExp(operandExp)} as smallint)";
case "System.Single": return $"cast({getExp(operandExp)} as float)";
case "System.String": return $"cast({getExp(operandExp)} as character)";
case "System.UInt16": return $"cast({getExp(operandExp)} as unsigned)";
case "System.UInt32": return $"cast({getExp(operandExp)} as decimal(10,0))";
case "System.UInt64": return $"cast({getExp(operandExp)} as decimal(21,0))";
case "System.Guid": return $"substr(cast({getExp(operandExp)} as character), 1, 36)";
}
}
break;
case ExpressionType.Call:
var callExp = exp as MethodCallExpression;
switch (callExp.Method.Name) {
case "Parse":
case "TryParse":
switch (callExp.Method.DeclaringType.NullableTypeOrThis().ToString()) {
case "System.Boolean": return $"({getExp(callExp.Arguments[0])} not in ('0','false'))";
case "System.Byte": return $"cast({getExp(callExp.Arguments[0])} as int2)";
case "System.Char": return $"substr(cast({getExp(callExp.Arguments[0])} as character), 1, 1)";
case "System.DateTime": return $"datetime({getExp(callExp.Arguments[0])})";
case "System.Decimal": return $"cast({getExp(callExp.Arguments[0])} as decimal(36,18))";
case "System.Double": return $"cast({getExp(callExp.Arguments[0])} as double)";
case "System.Int16":
case "System.Int32":
case "System.Int64":
case "System.SByte": return $"cast({getExp(callExp.Arguments[0])} as smallint)";
case "System.Single": return $"cast({getExp(callExp.Arguments[0])} as float)";
case "System.UInt16": return $"cast({getExp(callExp.Arguments[0])} as unsigned)";
case "System.UInt32": return $"cast({getExp(callExp.Arguments[0])} as decimal(10,0))";
case "System.UInt64": return $"cast({getExp(callExp.Arguments[0])} as decimal(21,0))";
case "System.Guid": return $"substr(cast({getExp(callExp.Arguments[0])} as character), 1, 36)";
}
break;
case "NewGuid":
break;
case "Next":
if (callExp.Object?.Type == typeof(Random)) return "cast(random()*1000000000 as int)";
break;
case "NextDouble":
if (callExp.Object?.Type == typeof(Random)) return "random()";
break;
case "Random":
if (callExp.Method.DeclaringType.IsNumberType()) return "random()";
break;
case "ToString":
if (callExp.Object != null) return $"cast({getExp(callExp.Object)} as character)";
break;
}
var objExp = callExp.Object;
var objType = objExp?.Type;
if (objType?.FullName == "System.Byte[]") return null;
var argIndex = 0;
if (objType == null && callExp.Method.DeclaringType == typeof(Enumerable)) {
objExp = callExp.Arguments.FirstOrDefault();
objType = objExp?.Type;
argIndex++;
}
if (objType == null) objType = callExp.Method.DeclaringType;
if (objType != null || objType.IsArray || typeof(IList).IsAssignableFrom(callExp.Method.DeclaringType)) {
var left = objExp == null ? null : getExp(objExp);
switch (callExp.Method.Name) {
case "Contains":
//判断 in
return $"({getExp(callExp.Arguments[argIndex])}) in {left}";
}
}
break;
case ExpressionType.NewArrayInit:
var arrExp = exp as NewArrayExpression;
var arrSb = new StringBuilder();
arrSb.Append("(");
for (var a = 0; a < arrExp.Expressions.Count; a++) {
if (a > 0) arrSb.Append(",");
arrSb.Append(getExp(arrExp.Expressions[a]));
}
if (arrSb.Length == 1) arrSb.Append("NULL");
return arrSb.Append(")").ToString();
case ExpressionType.ListInit:
var listExp = exp as ListInitExpression;
var listSb = new StringBuilder();
listSb.Append("(");
for (var a = 0; a < listExp.Initializers.Count; a++) {
if (listExp.Initializers[a].Arguments.Any() == false) continue;
if (a > 0) listSb.Append(",");
listSb.Append(getExp(listExp.Initializers[a].Arguments.FirstOrDefault()));
}
if (listSb.Length == 1) listSb.Append("NULL");
return listSb.Append(")").ToString();
case ExpressionType.New:
var newExp = exp as NewExpression;
if (typeof(IList).IsAssignableFrom(newExp.Type)) {
if (newExp.Arguments.Count == 0) return "(NULL)";
if (typeof(IEnumerable).IsAssignableFrom(newExp.Arguments[0].Type) == false) return "(NULL)";
return getExp(newExp.Arguments[0]);
}
return null;
}
return null;
}
internal override string ExpressionLambdaToSqlMemberAccessString(MemberExpression exp, ExpTSC tsc) {
if (exp.Expression == null) {
switch (exp.Member.Name) {
case "Empty": return "''";
}
return null;
}
var left = ExpressionLambdaToSql(exp.Expression, tsc);
switch (exp.Member.Name) {
case "Length": return $"length({left})";
}
return null;
}
internal override string ExpressionLambdaToSqlMemberAccessDateTime(MemberExpression exp, ExpTSC tsc) {
if (exp.Expression == null) {
switch (exp.Member.Name) {
case "Now": return "datetime(current_timestamp,'localtime')";
case "UtcNow": return "current_timestamp";
case "Today": return "date(current_timestamp,'localtime')";
case "MinValue": return "datetime('0001-01-01 00:00:00.000')";
case "MaxValue": return "datetime('9999-12-31 23:59:59.999')";
}
return null;
}
var left = ExpressionLambdaToSql(exp.Expression, tsc);
switch (exp.Member.Name) {
case "Date": return $"date({left})";
case "TimeOfDay": return $"strftime('%s',{left})";
case "DayOfWeek": return $"strftime('%w',{left})";
case "Day": return $"strftime('%d',{left})";
case "DayOfYear": return $"strftime('%j',{left})";
case "Month": return $"strftime('%m',{left})";
case "Year": return $"strftime('%Y',{left})";
case "Hour": return $"strftime('%H',{left})";
case "Minute": return $"strftime('%M',{left})";
case "Second": return $"strftime('%S',{left})";
case "Millisecond": return $"(strftime('%f',{left})-strftime('%S',{left}))";
case "Ticks": return $"(strftime('%s',{left})*10000000+621355968000000000)";
}
return null;
}
internal override string ExpressionLambdaToSqlMemberAccessTimeSpan(MemberExpression exp, ExpTSC tsc) {
if (exp.Expression == null) {
switch (exp.Member.Name) {
case "Zero": return "0";
case "MinValue": return "-922337203685.477580"; //秒 Ticks / 1000,000,0
case "MaxValue": return "922337203685.477580";
}
return null;
}
var left = ExpressionLambdaToSql(exp.Expression, tsc);
switch (exp.Member.Name) {
case "Days": return $"floor(({left})/{60 * 60 * 24})";
case "Hours": return $"floor(({left})/{60 * 60}%24)";
case "Milliseconds": return $"(cast({left} as bigint)*1000)";
case "Minutes": return $"floor(({left})/60%60)";
case "Seconds": return $"(({left})%60)";
case "Ticks": return $"(cast({left} as bigint)*10000000)";
case "TotalDays": return $"(({left})/{60 * 60 * 24})";
case "TotalHours": return $"(({left})/{60 * 60})";
case "TotalMilliseconds": return $"(cast({left} as bigint)*1000)";
case "TotalMinutes": return $"(({left})/60)";
case "TotalSeconds": return $"({left})";
}
return null;
}
internal override string ExpressionLambdaToSqlCallString(MethodCallExpression exp, ExpTSC tsc) {
Func<Expression, string> getExp = exparg => ExpressionLambdaToSql(exparg, tsc);
if (exp.Object == null) {
switch (exp.Method.Name) {
case "IsNullOrEmpty":
var arg1 = getExp(exp.Arguments[0]);
return $"({arg1} is null or {arg1} = '')";
case "Concat":
return _common.StringConcat(exp.Arguments.Select(a => getExp(a)).ToArray(), null);
}
} else {
var left = getExp(exp.Object);
switch (exp.Method.Name) {
case "StartsWith":
case "EndsWith":
case "Contains":
var args0Value = getExp(exp.Arguments[0]);
if (args0Value == "NULL") return $"({left}) IS NULL";
if (exp.Method.Name == "StartsWith") return $"({left}) LIKE {(args0Value.EndsWith("'") ? args0Value.Insert(args0Value.Length - 1, "%") : $"({args0Value})||'%'")}";
if (exp.Method.Name == "EndsWith") return $"({left}) LIKE {(args0Value.StartsWith("'") ? args0Value.Insert(1, "%") : $"'%'||({args0Value})")}";
if (args0Value.StartsWith("'") && args0Value.EndsWith("'")) return $"({left}) LIKE {args0Value.Insert(1, "%").Insert(args0Value.Length, "%")}";
return $"({left}) LIKE '%'||({args0Value})||'%'";
case "ToLower": return $"lower({left})";
case "ToUpper": return $"upper({left})";
case "Substring":
var substrArgs1 = getExp(exp.Arguments[0]);
if (long.TryParse(substrArgs1, out var testtrylng1)) substrArgs1 = (testtrylng1 + 1).ToString();
else substrArgs1 += "+1";
if (exp.Arguments.Count == 1) return $"substr({left}, {substrArgs1})";
return $"substr({left}, {substrArgs1}, {getExp(exp.Arguments[1])})";
case "IndexOf":
var indexOfFindStr = getExp(exp.Arguments[0]);
//if (exp.Arguments.Count > 1 && exp.Arguments[1].Type.FullName == "System.Int32") {
// var locateArgs1 = getExp(exp.Arguments[1]);
// if (long.TryParse(locateArgs1, out var testtrylng2)) locateArgs1 = (testtrylng2 + 1).ToString();
// else locateArgs1 += "+1";
// return $"(instr({left}, {indexOfFindStr}, {locateArgs1})-1)";
//}
return $"(instr({left}, {indexOfFindStr})-1)";
case "PadLeft":
if (exp.Arguments.Count == 1) return $"lpad({left}, {getExp(exp.Arguments[0])})";
return $"lpad({left}, {getExp(exp.Arguments[0])}, {getExp(exp.Arguments[1])})";
case "PadRight":
if (exp.Arguments.Count == 1) return $"rpad({left}, {getExp(exp.Arguments[0])})";
return $"rpad({left}, {getExp(exp.Arguments[0])}, {getExp(exp.Arguments[1])})";
case "Trim":
case "TrimStart":
case "TrimEnd":
if (exp.Arguments.Count == 0) {
if (exp.Method.Name == "Trim") return $"trim({left})";
if (exp.Method.Name == "TrimStart") return $"ltrim({left})";
if (exp.Method.Name == "TrimEnd") return $"rtrim({left})";
}
var trimArg1 = "";
var trimArg2 = "";
foreach (var argsTrim02 in exp.Arguments) {
var argsTrim01s = new[] { argsTrim02 };
if (argsTrim02.NodeType == ExpressionType.NewArrayInit) {
var arritem = argsTrim02 as NewArrayExpression;
argsTrim01s = arritem.Expressions.ToArray();
}
foreach (var argsTrim01 in argsTrim01s) {
var trimChr = getExp(argsTrim01).Trim('\'');
if (trimChr.Length == 1) trimArg1 += trimChr;
else trimArg2 += $" || ({trimChr})";
}
}
if (exp.Method.Name == "Trim") left = $"trim({left}, {_common.FormatSql("{0}", trimArg1)}{trimArg2})";
if (exp.Method.Name == "TrimStart") left = $"ltrim({left}, {_common.FormatSql("{0}", trimArg1)}{trimArg2})";
if (exp.Method.Name == "TrimEnd") left = $"rtrim({left}, {_common.FormatSql("{0}", trimArg1)}{trimArg2})";
return left;
case "Replace": return $"replace({left}, {getExp(exp.Arguments[0])}, {getExp(exp.Arguments[1])})";
case "CompareTo": return $"case when {left} = {getExp(exp.Arguments[0])} then 0 when {left} > {getExp(exp.Arguments[0])} then 1 else -1 end";
case "Equals": return $"({left} = {getExp(exp.Arguments[0])})";
}
}
throw new Exception($"SqliteExpression 未实现函数表达式 {exp} 解析");
}
internal override string ExpressionLambdaToSqlCallMath(MethodCallExpression exp, ExpTSC tsc) {
Func<Expression, string> getExp = exparg => ExpressionLambdaToSql(exparg, tsc);
switch (exp.Method.Name) {
case "Abs": return $"abs({getExp(exp.Arguments[0])})";
case "Sign": return $"sign({getExp(exp.Arguments[0])})";
case "Floor": return $"floor({getExp(exp.Arguments[0])})";
case "Ceiling": return $"ceiling({getExp(exp.Arguments[0])})";
case "Round":
if (exp.Arguments.Count > 1 && exp.Arguments[1].Type.FullName == "System.Int32") return $"round({getExp(exp.Arguments[0])}, {getExp(exp.Arguments[1])})";
return $"round({getExp(exp.Arguments[0])})";
case "Exp": return $"exp({getExp(exp.Arguments[0])})";
case "Log": return $"log({getExp(exp.Arguments[0])})";
case "Log10": return $"log10({getExp(exp.Arguments[0])})";
case "Pow": return $"power({getExp(exp.Arguments[0])}, {getExp(exp.Arguments[1])})";
case "Sqrt": return $"sqrt({getExp(exp.Arguments[0])})";
case "Cos": return $"cos({getExp(exp.Arguments[0])})";
case "Sin": return $"sin({getExp(exp.Arguments[0])})";
case "Tan": return $"tan({getExp(exp.Arguments[0])})";
case "Acos": return $"acos({getExp(exp.Arguments[0])})";
case "Asin": return $"asin({getExp(exp.Arguments[0])})";
case "Atan": return $"atan({getExp(exp.Arguments[0])})";
case "Atan2": return $"atan2({getExp(exp.Arguments[0])}, {getExp(exp.Arguments[1])})";
//case "Truncate": return $"truncate({getExp(exp.Arguments[0])}, 0)";
}
throw new Exception($"SqliteExpression 未实现函数表达式 {exp} 解析");
}
internal override string ExpressionLambdaToSqlCallDateTime(MethodCallExpression exp, ExpTSC tsc) {
Func<Expression, string> getExp = exparg => ExpressionLambdaToSql(exparg, tsc);
if (exp.Object == null) {
switch (exp.Method.Name) {
case "Compare": return $"(strftime('%s',{getExp(exp.Arguments[0])}) -strftime('%s',{getExp(exp.Arguments[1])}))";
case "DaysInMonth": return $"strftime('%d',date({getExp(exp.Arguments[0])}||'-01-01',{getExp(exp.Arguments[1])}||' months','-1 days'))";
case "Equals": return $"({getExp(exp.Arguments[0])} = {getExp(exp.Arguments[1])})";
case "IsLeapYear":
var isLeapYearArgs1 = getExp(exp.Arguments[0]);
return $"(({isLeapYearArgs1})%4=0 AND ({isLeapYearArgs1})%100<>0 OR ({isLeapYearArgs1})%400=0)";
case "Parse": return $"datetime({getExp(exp.Arguments[0])})";
case "ParseExact":
case "TryParse":
case "TryParseExact": return $"datetime({getExp(exp.Arguments[0])})";
}
} else {
var left = getExp(exp.Object);
var args1 = exp.Arguments.Count == 0 ? null : getExp(exp.Arguments[0]);
switch (exp.Method.Name) {
case "Add": return $"datetime({left},({args1})||' seconds')";
case "AddDays": return $"datetime({left},({args1})||' days')";
case "AddHours": return $"datetime({left},({args1})||' hours')";
case "AddMilliseconds": return $"datetime({left},(({args1})/1000)||' seconds')";
case "AddMinutes": return $"datetime({left},({args1})||' seconds')";
case "AddMonths": return $"datetime({left},({args1})||' months')";
case "AddSeconds": return $"datetime({left},({args1})||' seconds')";
case "AddTicks": return $"datetime({left},(({args1})/10000000)||' seconds')";
case "AddYears": return $"datetime({left},({args1})||' years')";
case "Subtract":
switch ((exp.Arguments[0].Type.IsNullableType() ? exp.Arguments[0].Type.GenericTypeArguments.FirstOrDefault() : exp.Arguments[0].Type).FullName) {
case "System.DateTime": return $"(strftime('%s',{left})-strftime('%s',{args1}))";
case "System.TimeSpan": return $"datetime({left},(-{args1})||' seconds')";
}
break;
case "Equals": return $"({left} = {getExp(exp.Arguments[0])})";
case "CompareTo": return $"(strftime('%s',{left})-strftime('%s',{args1}))";
case "ToString": return $"strftime('%Y-%m-%d %H:%M.%f',{left})";
}
}
throw new Exception($"SqliteExpression 未实现函数表达式 {exp} 解析");
}
internal override string ExpressionLambdaToSqlCallTimeSpan(MethodCallExpression exp, ExpTSC tsc) {
Func<Expression, string> getExp = exparg => ExpressionLambdaToSql(exparg, tsc);
if (exp.Object == null) {
switch (exp.Method.Name) {
case "Compare": return $"({getExp(exp.Arguments[0])}-({getExp(exp.Arguments[1])}))";
case "Equals": return $"({getExp(exp.Arguments[0])} = {getExp(exp.Arguments[1])})";
case "FromDays": return $"(({getExp(exp.Arguments[0])})*{60 * 60 * 24})";
case "FromHours": return $"(({getExp(exp.Arguments[0])})*{60 * 60})";
case "FromMilliseconds": return $"(({getExp(exp.Arguments[0])})/1000)";
case "FromMinutes": return $"(({getExp(exp.Arguments[0])})*60)";
case "FromSeconds": return $"(({getExp(exp.Arguments[0])}))";
case "FromTicks": return $"(({getExp(exp.Arguments[0])})/10000000)";
case "Parse": return $"cast({getExp(exp.Arguments[0])} as bigint)";
case "ParseExact":
case "TryParse":
case "TryParseExact": return $"cast({getExp(exp.Arguments[0])} as bigint)";
}
} else {
var left = getExp(exp.Object);
var args1 = exp.Arguments.Count == 0 ? null : getExp(exp.Arguments[0]);
switch (exp.Method.Name) {
case "Add": return $"({left}+{args1})";
case "Subtract": return $"({left}-({args1}))";
case "Equals": return $"({left} = {getExp(exp.Arguments[0])})";
case "CompareTo": return $"({left}-({getExp(exp.Arguments[0])}))";
case "ToString": return $"cast({left} as character)";
}
}
throw new Exception($"SqliteExpression 未实现函数表达式 {exp} 解析");
}
internal override string ExpressionLambdaToSqlCallConvert(MethodCallExpression exp, ExpTSC tsc) {
Func<Expression, string> getExp = exparg => ExpressionLambdaToSql(exparg, tsc);
if (exp.Object == null) {
switch (exp.Method.Name) {
case "ToBoolean": return $"({getExp(exp.Arguments[0])} not in ('0','false'))";
case "ToByte": return $"cast({getExp(exp.Arguments[0])} as int2)";
case "ToChar": return $"substr(cast({getExp(exp.Arguments[0])} as character), 1, 1)";
case "ToDateTime": return $"datetime({getExp(exp.Arguments[0])})";
case "ToDecimal": return $"cast({getExp(exp.Arguments[0])} as decimal(36,18))";
case "ToDouble": return $"cast({getExp(exp.Arguments[0])} as double)";
case "ToInt16":
case "ToInt32":
case "ToInt64":
case "ToSByte": return $"cast({getExp(exp.Arguments[0])} as smallint)";
case "ToSingle": return $"cast({getExp(exp.Arguments[0])} as float)";
case "ToString": return $"cast({getExp(exp.Arguments[0])} as character)";
case "ToUInt16": return $"cast({getExp(exp.Arguments[0])} as unsigned)";
case "ToUInt32": return $"cast({getExp(exp.Arguments[0])} as decimal(10,0))";
case "ToUInt64": return $"cast({getExp(exp.Arguments[0])} as decimal(21,0))";
}
}
throw new Exception($"SqliteExpression 未实现函数表达式 {exp} 解析");
}
}
}
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