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FreeSql/FreeSql/MySql/MySqlExpression.cs
28810 a2a3bb62d2 文字错误更正
2019-03-04 11:22:52 +08:00

316 lines
17 KiB
C#
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using FreeSql.Internal;
using FreeSql.Internal.Model;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
namespace FreeSql.MySql {
class MySqlExpression : CommonExpression {
public MySqlExpression(CommonUtils common) : base(common) { }
internal override string ExpressionLambdaToSqlOther(Expression exp, List<SelectTableInfo> _tables, List<SelectColumnInfo> _selectColumnMap, Func<Expression[], string> getSelectGroupingMapString, SelectTableInfoType tbtype, bool isQuoteName) {
Func<Expression, string> getExp = exparg => ExpressionLambdaToSql(exparg, _tables, _selectColumnMap, getSelectGroupingMapString, tbtype, isQuoteName);
switch (exp.NodeType) {
case ExpressionType.Call:
var callExp = exp as MethodCallExpression;
var objExp = callExp.Object;
var objType = objExp?.Type;
if (objType?.FullName == "System.Byte[]") return null;
var argIndex = 0;
if (objType == null && callExp.Method.DeclaringType.FullName == typeof(Enumerable).FullName) {
objExp = callExp.Arguments.FirstOrDefault();
objType = objExp?.Type;
argIndex++;
}
if (objType == null) objType = callExp.Method.DeclaringType;
if (objType != null) {
var left = objExp == null ? null : getExp(objExp);
if (objType.IsArray == true) {
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]));
}
return arrSb.Append(")").ToString();
}
return null;
}
internal override string ExpressionLambdaToSqlMemberAccessString(MemberExpression exp, List<SelectTableInfo> _tables, List<SelectColumnInfo> _selectColumnMap, Func<Expression[], string> getSelectGroupingMapString, SelectTableInfoType tbtype, bool isQuoteName) {
if (exp.Expression == null) {
switch (exp.Member.Name) {
case "Empty": return "''";
}
return null;
}
var left = ExpressionLambdaToSql(exp.Expression, _tables, _selectColumnMap, getSelectGroupingMapString, tbtype, isQuoteName);
switch (exp.Member.Name) {
case "Length": return $"char_length({left})";
}
return null;
}
internal override string ExpressionLambdaToSqlMemberAccessDateTime(MemberExpression exp, List<SelectTableInfo> _tables, List<SelectColumnInfo> _selectColumnMap, Func<Expression[], string> getSelectGroupingMapString, SelectTableInfoType tbtype, bool isQuoteName) {
if (exp.Expression == null) {
switch (exp.Member.Name) {
case "Now": return "now()";
case "UtcNow": return "utc_timestamp()";
case "Today": return "curdate()";
case "MinValue": return "cast('0001/1/1 0:00:00' as datetime)";
case "MaxValue": return "cast('9999/12/31 23:59:59' as datetime)";
}
return null;
}
var left = ExpressionLambdaToSql(exp.Expression, _tables, _selectColumnMap, getSelectGroupingMapString, tbtype, isQuoteName);
switch (exp.Member.Name) {
case "Date": return $"cast(date_format({left},'%Y-%m-%d') as datetime)";
case "TimeOfDay": return $"timestampdiff(microsecond, date_format({left},'%Y-%m-%d'), {left})";
case "DayOfWeek": return $"(dayofweek({left})-1)";
case "Day": return $"dayofmonth({left})";
case "DayOfYear": return $"dayofyear({left})";
case "Month": return $"month({left})";
case "Year": return $"year({left})";
case "Hour": return $"hour({left})";
case "Minute": return $"minute({left})";
case "Second": return $"second({left})";
case "Millisecond": return $"floor(microsecond({left})/1000)";
case "Ticks": return $"(timestampdiff(microsecond, '0001-1-1', {left})*10)";
}
return null;
}
internal override string ExpressionLambdaToSqlMemberAccessTimeSpan(MemberExpression exp, List<SelectTableInfo> _tables, List<SelectColumnInfo> _selectColumnMap, Func<Expression[], string> getSelectGroupingMapString, SelectTableInfoType tbtype, bool isQuoteName) {
if (exp.Expression == null) {
switch (exp.Member.Name) {
case "Zero": return "0";
case "MinValue": return "-922337203685477580"; //微秒 Ticks / 10
case "MaxValue": return "922337203685477580";
}
return null;
}
var left = ExpressionLambdaToSql(exp.Expression, _tables, _selectColumnMap, getSelectGroupingMapString, tbtype, isQuoteName);
switch (exp.Member.Name) {
case "Days": return $"(({left}) div {(long)1000000 * 60 * 60 * 24})";
case "Hours": return $"(({left}) div {(long)1000000 * 60 * 60} mod 24)";
case "Milliseconds": return $"(({left}) div 1000 mod 1000)";
case "Minutes": return $"(({left}) div {(long)1000000 * 60} mod 60)";
case "Seconds": return $"(({left}) div 1000000 mod 60)";
case "Ticks": return $"(({left}) * 10)";
case "TotalDays": return $"(({left}) / {(long)1000000 * 60 * 60 * 24})";
case "TotalHours": return $"(({left}) / {(long)1000000 * 60 * 60})";
case "TotalMilliseconds": return $"(({left}) / 1000)";
case "TotalMinutes": return $"(({left}) / {(long)1000000 * 60})";
case "TotalSeconds": return $"(({left}) / 1000000)";
}
return null;
}
internal override string ExpressionLambdaToSqlCallString(MethodCallExpression exp, List<SelectTableInfo> _tables, List<SelectColumnInfo> _selectColumnMap, Func<Expression[], string> getSelectGroupingMapString, SelectTableInfoType tbtype, bool isQuoteName) {
Func<Expression, string> getExp = exparg => ExpressionLambdaToSql(exparg, _tables, _selectColumnMap, getSelectGroupingMapString, tbtype, isQuoteName);
if (exp.Object == null) {
switch (exp.Method.Name) {
case "IsNullOrEmpty":
var arg1 = getExp(exp.Arguments[0]);
return $"({arg1} is null or {arg1} = '')";
}
} 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, "%") : $"concat({args0Value}, '%')")}";
if (exp.Method.Name == "EndsWith") return $"({left}) LIKE {(args0Value.StartsWith("'") ? args0Value.Insert(1, "%") : $"concat('%', {args0Value})")}";
if (args0Value.StartsWith("'") && args0Value.EndsWith("'")) return $"({left}) LIKE {args0Value.Insert(1, "%").Insert(args0Value.Length, "%")}";
return $"({left}) LIKE concat('%', {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 $"(locate({left}, {indexOfFindStr}, {locateArgs1})-1)";
}
return $"(locate({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})";
}
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) {
if (exp.Method.Name == "Trim") left = $"trim({getExp(argsTrim01)} from {left})";
if (exp.Method.Name == "TrimStart") left = $"trim(leading {getExp(argsTrim01)} from {left})";
if (exp.Method.Name == "TrimEnd") left = $"trim(trailing {getExp(argsTrim01)} from {left})";
}
}
return left;
case "Replace": return $"replace({left}, {getExp(exp.Arguments[0])}, {getExp(exp.Arguments[1])})";
case "CompareTo": return $"strcmp({left}, {getExp(exp.Arguments[0])})";
case "Equals": return $"({left} = {getExp(exp.Arguments[0])})";
}
}
throw new Exception($"MySqlExpression 未实现函数表达式 {exp} 解析");
}
internal override string ExpressionLambdaToSqlCallMath(MethodCallExpression exp, List<SelectTableInfo> _tables, List<SelectColumnInfo> _selectColumnMap, Func<Expression[], string> getSelectGroupingMapString, SelectTableInfoType tbtype, bool isQuoteName) {
Func<Expression, string> getExp = exparg => ExpressionLambdaToSql(exparg, _tables, _selectColumnMap, getSelectGroupingMapString, tbtype, isQuoteName);
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 $"pow({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 $"truncate({getExp(exp.Arguments[0])}, 0)";
}
throw new Exception($"MySqlExpression 未实现函数表达式 {exp} 解析");
}
internal override string ExpressionLambdaToSqlCallDateTime(MethodCallExpression exp, List<SelectTableInfo> _tables, List<SelectColumnInfo> _selectColumnMap, Func<Expression[], string> getSelectGroupingMapString, SelectTableInfoType tbtype, bool isQuoteName) {
Func<Expression, string> getExp = exparg => ExpressionLambdaToSql(exparg, _tables, _selectColumnMap, getSelectGroupingMapString, tbtype, isQuoteName);
if (exp.Object == null) {
switch (exp.Method.Name) {
case "Compare": return $"({getExp(exp.Arguments[0])} - ({getExp(exp.Arguments[1])}))";
case "DaysInMonth": return $"dayofmonth(last_day(concat({getExp(exp.Arguments[0])}, '-', {getExp(exp.Arguments[1])}, '-01')))";
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 $"cast({getExp(exp.Arguments[0])} as datetime)";
case "ParseExact":
case "TryParse":
case "TryParseExact": return $"cast({getExp(exp.Arguments[0])} as datetime)";
}
} else {
var left = getExp(exp.Object);
var args1 = exp.Arguments.Count == 0 ? null : getExp(exp.Arguments[0]);
switch (exp.Method.Name) {
case "Add": return $"date_add({left}, interval ({args1}) microsecond)";
case "AddDays": return $"date_add({left}, interval ({args1}) day)";
case "AddHours": return $"date_add({left}, interval ({args1}) hour)";
case "AddMilliseconds": return $"date_add({left}, interval ({args1})*1000 microsecond)";
case "AddMinutes": return $"date_add({left}, interval ({args1}) minute)";
case "AddMonths": return $"date_add({left}, interval ({args1}) month)";
case "AddSeconds": return $"date_add({left}, interval ({args1}) second)";
case "AddTicks": return $"date_add({left}, interval ({args1})/10 microsecond)";
case "AddYears": return $"date_add({left}, interval ({args1}) year)";
case "Subtract":
switch((exp.Arguments[0].Type.IsNullableType() ? exp.Arguments[0].Type.GenericTypeArguments.FirstOrDefault() : exp.Arguments[0].Type).FullName) {
case "System.DateTime": return $"timestampdiff(microsecond, {args1}, {left})";
case "System.TimeSpan": return $"date_sub({left}, interval ({args1}) microsecond)";
}
break;
case "Equals": return $"({left} = {getExp(exp.Arguments[0])})";
case "CompareTo": return $"(({left}) - ({getExp(exp.Arguments[0])}))";
case "ToString": return $"date_format({left}, '%Y-%m-%d %H:%i:%s.%f')";
}
}
throw new Exception($"MySqlExpression 未实现函数表达式 {exp} 解析");
}
internal override string ExpressionLambdaToSqlCallTimeSpan(MethodCallExpression exp, List<SelectTableInfo> _tables, List<SelectColumnInfo> _selectColumnMap, Func<Expression[], string> getSelectGroupingMapString, SelectTableInfoType tbtype, bool isQuoteName) {
Func<Expression, string> getExp = exparg => ExpressionLambdaToSql(exparg, _tables, _selectColumnMap, getSelectGroupingMapString, tbtype, isQuoteName);
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])})*{(long)1000000 * 60 * 60 * 24})";
case "FromHours": return $"(({getExp(exp.Arguments[0])})*{(long)1000000 * 60 * 60})";
case "FromMilliseconds": return $"(({getExp(exp.Arguments[0])})*1000)";
case "FromMinutes": return $"(({getExp(exp.Arguments[0])})*{(long)1000000 * 60})";
case "FromSeconds": return $"(({getExp(exp.Arguments[0])})*1000000)";
case "FromTicks": return $"(({getExp(exp.Arguments[0])})/10)";
case "Parse": return $"cast({getExp(exp.Arguments[0])} as signed)";
case "ParseExact":
case "TryParse":
case "TryParseExact": return $"cast({getExp(exp.Arguments[0])} as signed)";
}
} 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 $"cast({left} as char)";
}
}
throw new Exception($"MySqlExpression 未实现函数表达式 {exp} 解析");
}
internal override string ExpressionLambdaToSqlCallConvert(MethodCallExpression exp, List<SelectTableInfo> _tables, List<SelectColumnInfo> _selectColumnMap, Func<Expression[], string> getSelectGroupingMapString, SelectTableInfoType tbtype, bool isQuoteName) {
Func<Expression, string> getExp = exparg => ExpressionLambdaToSql(exparg, _tables, _selectColumnMap, getSelectGroupingMapString, tbtype, isQuoteName);
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 unsigned)";
case "ToChar": return $"substr(cast({getExp(exp.Arguments[0])} as char), 1, 1)";
case "ToDateTime": return $"cast({getExp(exp.Arguments[0])} as datetime)";
case "ToDecimal": return $"cast({getExp(exp.Arguments[0])} as decimal(36,18))";
case "ToDouble": return $"cast({getExp(exp.Arguments[0])} as decimal(32,16))";
case "ToInt16":
case "ToInt32":
case "ToInt64":
case "ToSByte": return $"cast({getExp(exp.Arguments[0])} as signed)";
case "ToSingle": return $"cast({getExp(exp.Arguments[0])} as decimal(14,7))";
case "ToString": return $"cast({getExp(exp.Arguments[0])} as char)";
case "ToUInt16":
case "ToUInt32":
case "ToUInt64": return $"cast({getExp(exp.Arguments[0])} as unsigned)";
}
}
throw new Exception($"MySqlExpression 未实现函数表达式 {exp} 解析");
}
}
}
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