C/C++教程
重写ExpressionVisitor完成LINQ查询Where运算符表达式树解析生成Sql脚本（Oracle版本）
本文主要是介绍重写ExpressionVisitor完成LINQ查询Where运算符表达式树解析生成Sql脚本（Oracle版本），对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！
众所周知，ORM是一种为了解决面向对象编程与关系数据库存在的互不匹配的现象的技术，其目标是基于面向对象编程语言（如C#、Java等）持久化类及映射关系完成对数据库操作（一般为读操作与写操作，也就是常说的增删改查）。其中一个关键点则是如何生成关系数据库能够识别的Sql，此处只讨论C#ORM实现中读操作生成Sql，也就是如何完成C#中LINQ查询到Sql的转换。LINQ中定义了大量大查询操作符，而基于数据库查询一般都需要使用Where子句，故在此我们进一步缩小讨论范围至LINQ的Where操作符。
核心代码
核心代码
using FXY.Code.ORM.Mapping;
using System;
using System.Collections.Generic;
using System.Data.Linq.Mapping;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
using System.Text.RegularExpressions;
namespace FXY.Code.ORM.ExpressionVisit
{
public class WhereExpressionVisitor : ExpressionVisitor
{
/// <summary>
/// 是否启用数据库字段与实体属性之间的映射关系。
/// </summary>
private bool useColumnAttributeMap;
/// <summary>
/// 是否启用参数化
/// </summary>
private bool useDbParamter;
/// <summary>
/// 是否生成完整的查询语句
/// </summary>
private bool generateFullQuery;
/// <summary>
/// 参数化字典
/// </summary>
private Dictionary<string, object> dbParameters = new Dictionary<string, object>();
/// <summary>
/// 参数化关键字，如oracle为":Id"格式
/// </summary>
private string dbParamterKey = "";
/// <summary>
/// 是否启用表别名
/// </summary>
private bool useAlias;
private IDataBaseMapping dataBaseMapper;
/// <summary>
/// 构造函数
/// </summary>
/// <param name="useColumnAttributeMap">是否启用<see cref="ColumnAttribute"/>特性建立属性与数据库字段之间的映射关系。</param>
/// <param name="generateFullQuery">是否生成完成的数据库查询语句，false不会返回SELECT * FROM {TABLE} WHERE部分。</param>
/// <param name="useDbParamter">是否启用参数化</param>
/// <param name="dbParamterKey">参数化</param>
public WhereExpressionVisitor(bool useColumnAttributeMap,
bool generateFullQuery,
bool useDbParamter,
string dbParamterKey,
bool useAlias,
IDataBaseMapping dataBaseMapping = null)
{
this.useColumnAttributeMap = useColumnAttributeMap;
this.generateFullQuery = generateFullQuery;
this.useDbParamter = useDbParamter;
this.dbParamterKey = dbParamterKey;
this.useAlias = useAlias;
this.dataBaseMapper = dataBaseMapping ?? new DataBaseMapping();
}
/// 构造函数
/// </summary>
public WhereExpressionVisitor()
: base()
{
}
public void SetDataBaseMapper<T>() where T : DataBaseMapping, new()
{
this.dataBaseMapper = new T();
}
/// <summary>
/// 获取参数化字典
/// </summary>
/// <returns></returns>
public Dictionary<string, object> GetDbParamter() => dbParameters;
/// <summary>
/// 将表达式树解析为数据查询语句
/// </summary>
/// <typeparam name="TSource">实体</typeparam>
/// <param name="expression">表达式树</param>
/// <returns></returns>
public string ToSql<TSource>(Expression<Func<TSource, bool>> expression)
{
string result = "";
dbParameters.Clear();
if (generateFullQuery)
{
string dbName = dataBaseMapper.GetDbName<TSource>();
string tableName = dataBaseMapper.GetDbTableName<TSource>();
if (!string.IsNullOrWhiteSpace(dbName))
{
tableName = $"{dbName}.{tableName}";
};
result += $@"SELECT * FROM {tableName}";
if (useAlias)
{
LambdaExpression lambdaExpression = expression;
string tableParamterName = lambdaExpression.Parameters[0].Name;
result += $@" {tableParamterName}";
}
result += $@" WHERE ";
}
result += Visit(expression.Body);
return result;
}
public new string Visit(Expression node)
{
if (node is BinaryExpression binaryExpression)
{
return VisitBinary(binaryExpression);
}
else if (node is ConditionalExpression conditionalExpression)
{
return VisitConditional(conditionalExpression);
}
else if (node is ConstantExpression constantExpression)
{
return VisitConstant(constantExpression);
}
else if (node is MemberExpression memberExpression)
{
return VisitMember(memberExpression);
}
else if (node is ParameterExpression parameterExpression)
{
return VisitParameter(parameterExpression);
}
else if (node is MethodCallExpression methodCallExpression)
{
return VisitMethodCall(methodCallExpression);
}
else if (node is UnaryExpression unaryExpression)
{
return VisitUnary(unaryExpression);
}
else if (node is NewExpression newExpression)
{
return VisitNew(newExpression);
}
throw new NotSupportedException();
}
protected new string VisitBinary(BinaryExpression node)
{
if (node == null)
{
return string.Empty;
}
switch (node.NodeType)
{
/*条件布尔运算*/
case ExpressionType.AndAlso: return $"({Visit(node.Left)}) AND ({Visit(node.Right)})";
case ExpressionType.OrElse: return $"({Visit(node.Left)}) OR ({Visit(node.Right)})";
/*比较运算*/
case ExpressionType.GreaterThan: return $"{Visit(node.Left)}>{Visit(node.Right)}";
case ExpressionType.GreaterThanOrEqual: return $"{Visit(node.Left)}>={Visit(node.Right)}";
case ExpressionType.Equal: return $"{Visit(node.Left)}={Visit(node.Right)}";
case ExpressionType.NotEqual: return $"{Visit(node.Left)}<>{Visit(node.Right)}";
case ExpressionType.LessThan: return $"{Visit(node.Left)}<{Visit(node.Right)}";
case ExpressionType.LessThanOrEqual: return $"{Visit(node.Left)}<={Visit(node.Right)}";
/*算术运算*/
case ExpressionType.Add: return Visit(Expression.Call(node.Method, node.Left, node.Right));
case ExpressionType.AddChecked: return Visit(Expression.Call(node.Method, node.Left, node.Right));
case ExpressionType.Divide: return Visit(Expression.Call(node.Method, node.Left, node.Right));
case ExpressionType.Modulo: return Visit(Expression.Call(node.Method, node.Left, node.Right));
case ExpressionType.Multiply: return Visit(Expression.Call(node.Method, node.Left, node.Right));
case ExpressionType.MultiplyChecked: return Visit(Expression.Call(node.Method, node.Left, node.Right));
case ExpressionType.Subtract: return Visit(Expression.Call(node.Method, node.Left, node.Right));
case ExpressionType.SubtractChecked: return Visit(Expression.Call(node.Method, node.Left, node.Right));
///*移位运算*/
//case ExpressionType.LeftShift:
//case ExpressionType.RightShift:
/*合并运算*/
case ExpressionType.Coalesce: return $" NVL({Visit(node.Left)},{Visit(node.Right)})";
///*数组索引操作*/
//case ExpressionType.ArrayIndex:
default: throw new NotSupportedException($"二元表达式树节点类型[{node.NodeType}]暂不支持解析。");
}
}
protected new string VisitConditional(ConditionalExpression node)
{
if (node.Test is BinaryExpression b)
{
return $" (CASE {Visit(b.Left)} WHEN {Visit(b.Right)} THEN {Visit(node.IfTrue)} ELSE {Visit(node.IfFalse)} END)";
}
throw new NotSupportedException();
}
protected new string VisitConstant(ConstantExpression node)
{
if (node == null
|| node.Value == null)
{
throw new NotSupportedException($"常量表达式树解析失败，不允许为空。");
}
Type type = node.Value.GetType();
string result = "";
if (type == typeof(string)
|| type == typeof(char))
{
result = $"'{node.Value}'";
}
else if (type == typeof(short)
|| type == typeof(int)
|| type == typeof(long)
|| type == typeof(float)
|| type == typeof(double)
|| type == typeof(decimal))
{
result = $"{node.Value}";
}
else if (type == typeof(DateTime))
{
DateTime.TryParse(node.Value.ToString(), out DateTime datetime);
result = $"TO_DATE('{datetime.ToString("yyyy-MM-dd HH:mm:ss")}','yyyy-MM-dd hh24:mi:ss')";
}
else
{
throw new NotSupportedException($"暂不支持[{type.FullName}]常量类型的解析。");
}
if (useDbParamter)
{
string paramName = $"{dbParamterKey}Param{dbParameters.Count}";
object paramValue = result;
dbParameters.Add(paramName, paramValue);
result = paramName;
}
return result;
}
protected new string VisitMember(MemberExpression node)
{
if (node == null)
{
return string.Empty;
}
if (node.Expression is ConstantExpression constantExpression)
{
object value = null;
if (node.Member is PropertyInfo propertyInfo)
{
value = propertyInfo.GetValue(constantExpression.Value);
}
if (node.Member is FieldInfo fieldInfo)
{
value = fieldInfo.GetValue(constantExpression.Value);
}
return Visit(Expression.Constant(value));
}
if (node.Expression is ParameterExpression parameterExpression)
{
string result = "";
if (useAlias)
{
result += $"{Visit(parameterExpression)}.";
}
string columnName = !useColumnAttributeMap
? node.Member.Name
: dataBaseMapper.GetColumnName(node.Member);
result += $"{columnName.ToUpper()}";
return result;
}
throw new NotSupportedException($"暂不支持[{node.Expression.ToString()}]MemberExpression的解析。");
}
protected new string VisitMethodCall(MethodCallExpression node)
{
switch (node.Method.ReturnType.Name)
{
case "Boolean": return VisitMethodCallReturnBoolean(node);
case "String": return VisitMethodCallReturnString(node);
default: return "";
}
}
protected new string VisitParameter(ParameterExpression node)
{
return useAlias ? $"{node.Name}" : string.Empty;
}
protected new string VisitUnary(UnaryExpression node)
{
return Visit(node.Operand);
}
protected new string VisitNew(NewExpression node)
{
if (node.Type == typeof(DateTime))
{
int hour = 0;
int minute = 0;
int second = 0;
int.TryParse(node.Arguments[0].ToString(), out int year);
int.TryParse(node.Arguments[1].ToString(), out int month);
int.TryParse(node.Arguments[2].ToString(), out int day);
if (node.Arguments.Count > 3)
{
int.TryParse(node.Arguments[3].ToString(), out hour);
int.TryParse(node.Arguments[4].ToString(), out minute);
int.TryParse(node.Arguments[5].ToString(), out second);
}
DateTime dateTime = new DateTime(year, month, day, hour, minute, second);
return $"TO_DATE('{dateTime.ToString("yyyy-MM-dd HH:mm:ss")}','yyyy-MM-dd hh24:mi:ss')";
}
return string.Empty;
}
protected new string VisitBlock(BlockExpression node) { throw new NotSupportedException(); }
protected new string VisitDebugInfo(DebugInfoExpression node) { throw new NotSupportedException(); }
protected new string VisitDefault(DefaultExpression node) { throw new NotSupportedException(); }
protected new string VisitDynamic(DynamicExpression node) { throw new NotSupportedException(); }
protected new string VisitExtension(Expression node) { throw new NotSupportedException(); }
protected new string VisitGoto(GotoExpression node) { throw new NotSupportedException(); }
protected new string VisitIndex(IndexExpression node) { throw new NotSupportedException(); }
protected new string VisitInvocation(InvocationExpression node) { throw new NotSupportedException(); }
protected new string VisitLabel(LabelExpression node) { throw new NotSupportedException(); }
protected new string VisitLambda<T>(Expression<T> node) { throw new NotSupportedException(); }
protected new string VisitListInit(ListInitExpression node) { throw new NotSupportedException(); }
protected new string VisitLoop(LoopExpression node) { throw new NotSupportedException(); }
protected new string VisitMemberInit(MemberInitExpression node) { throw new NotSupportedException(); }
protected new string VisitNewArray(NewArrayExpression node) { throw new NotSupportedException(); }
protected new string VisitRuntimeVariables(RuntimeVariablesExpression node) { throw new NotSupportedException(); }
protected new string VisitSwitch(SwitchExpression node) { throw new NotSupportedException(); }
protected new string VisitTry(TryExpression node) { throw new NotSupportedException(); }
protected new string VisitTypeBinary(TypeBinaryExpression node) { throw new NotSupportedException(); }
#region VisitMethodCall By Return Type
public virtual string VisitMethodCallReturnBoolean(MethodCallExpression node)
{
switch (node.Method.Name)
{
case "StartsWith":
return $"{Visit(node.Object)} LIKE { string.Join("", Visit(node.Arguments[0]).LastSkip(1))}%'";
case "EndsWith":
return $"{Visit(node.Object)} LIKE '%{ string.Join("", Visit(node.Arguments[0]).Skip(1).LastSkip(1))}'";
case "Equals":
return $"{Visit(node.Object)}={string.Join("", Visit(node.Arguments[0]))}";
case "Contains":
return $"{ Visit(node.Object)} LIKE '%{ string.Join("", Visit(node.Arguments[0]).Skip(1).LastSkip(1))}%'";
default:
return string.Empty;
}
}
public virtual string VisitMethodCallReturnString(MethodCallExpression node)
{
switch (node.Method.Name)
{
case "Concat":
return $"'{string.Join("", node.Arguments.Select(p => Visit(p).RemoveFirstAndLastChar()))}'";
case "Format":
var array1 = Regex.Split(node.Arguments[0].ToString().Substring(1), "{[0-9]+}");
var array2 = node.Arguments.Skip(1).ToList();
if (node.Arguments.Count > 1 && node.Arguments[1] is NewArrayExpression newArrayExpression)
{
array2 = newArrayExpression.Expressions.ToList();
}
return $@"'{string.Join("",
array2.Select(p => array1[array2.IndexOf(p)] + Visit(p).RemoveFirstAndLastChar()))}'";
case "ToLower": return $"LOWER({Visit(node.Arguments[0])})";
case "ToUpper": return $"UPPER({Visit(node.Arguments[0])})";
default: return string.Empty;
}
}
#endregion
}
}
扩展辅助类
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
namespace FXY.Code.ORM.ExpressionVisit
{
public static class ExtensionExpression
{
public static object GetValue(this PropertyInfo propertyInfo, object obj)
{
return propertyInfo.GetValue(obj, null);
}
public static TAttribute GetAttribute<TAttribute>(this MemberInfo memberInfo)
where TAttribute : Attribute
{
var attributes = memberInfo.GetCustomAttributes(typeof(TAttribute), true);
if (attributes != null && attributes.Length > 0)
{
return attributes[0] as TAttribute;
}
return null;
}
public static TAttribute GetAttribute<TAttribute>(this Type type)
where TAttribute : Attribute
{
var attributes = type.GetCustomAttributes(typeof(TAttribute), true);
TAttribute attribute = attributes != null && attributes.Length > 0 ? attributes[0] as TAttribute : null;
return attribute;
}
public static void Add(this StringBuilder sb, string str)
{
}
public static IEnumerable<T> LastSkip<T>(this IEnumerable<T> equatable, int count)
{
return equatable.Take(equatable.Count() - count);
}
public static string RemoveFirstAndLastChar(this string str, char skip = '\'')
{
var list = str as IEnumerable<char>;
if (list?.FirstOrDefault() == skip)
{
list = list.Skip(1);
}
if (list?.LastOrDefault() == skip)
{
list = list.LastSkip(1);
}
return new string(list.ToArray());
}
}
}
单元测试类
基本流程测试
测试用例中所谓参数，是基于
/// <summary>
/// 构造函数
/// </summary>
/// <param name="useColumnAttributeMap">是否启用<see cref="ColumnAttribute"/>特性建立属性与数据库字段之间的映射关系。</param>
/// <param name="generateFullQuery">是否生成完成的数据库查询语句，false不会返回SELECT * FROM {TABLE} WHERE部分。</param>
/// <param name="useDbParamter">是否启用参数化</param>
/// <param name="dbParamterKey">参数化</param>
public WhereExpressionVisitor(bool useColumnAttributeMap,
bool generateFullQuery,
bool useDbParamter,
string dbParamterKey,
bool useAlias,
IDataBaseMapping dataBaseMapping = null)
即
- 是否启用基于ColumnAttribute特性建立属性与数据库字段之间映射关系；
- 是否生成完成的数据库查询语句，false不会返回SELECT * FROM {TABLE} WHERE部分;
- 是否启用参数化；
- 是否启用表别名；
SingleParamVisitorUnitTest：单参数基本流程测试
using FXY.Code.ORM.ExpressionVisit;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System;
namespace FXY.Code.ORM.ExpressionVisit.Test
{
[TestClass]
public class SingleParamVisitorUnitTest
{
private WhereExpressionVisitor visitor = new WhereExpressionVisitor();
#region 单参数测试
[TestMethod]
public void BaseUseColumnMap()
{
visitor = new WhereExpressionVisitor(true, false, false, "", false);
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.ID == "20"), "PATIENT_ID='20'");
Assert.AreEqual(
visitor.ToSql<PatientInfo>(p => p.Age > 20 && p.Sex == 1),
"(PATIENT_AGE>20) AND (PATIENT_SEX=1)");
Assert.AreEqual(
visitor.ToSql<PatientInfo>(p => p.Age > 20
&& p.Sex == 1
&& p.TelePhone.StartsWith("135")),
"((PATIENT_AGE>20) AND (PATIENT_SEX=1)) AND (PATIENT_TELEPHONE LIKE '135%')");
Assert.AreEqual(
visitor.ToSql<PatientInfo>(p => p.Age > 20
&& p.Sex == 1
&& (p.TelePhone.StartsWith("135") || p.Province.Contains("云南"))),
"((PATIENT_AGE>20) AND (PATIENT_SEX=1)) AND ((PATIENT_TELEPHONE LIKE '135%') OR (PATIENT_PROVINCE LIKE '%云南%'))");
}
[TestMethod]
public void BaseGenetateFullQuery()
{
visitor = new WhereExpressionVisitor(false, true, false, "", false);
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.ID == "20"),
"SELECT * FROM PATIENT WHERE ID='20'");
Assert.AreEqual(
visitor.ToSql<PatientInfo>(p => p.Age > 20 && p.Sex == 1),
"SELECT * FROM PATIENT WHERE (AGE>20) AND (SEX=1)");
Assert.AreEqual(
visitor.ToSql<PatientInfo>(p => p.Age > 20
&& p.Sex == 1
&& p.TelePhone.StartsWith("135")),
"SELECT * FROM PATIENT WHERE ((AGE>20) AND (SEX=1)) AND (TELEPHONE LIKE '135%')");
Assert.AreEqual(
visitor.ToSql<PatientInfo>(p => p.Age > 20
&& p.Sex == 1
&& (p.TelePhone.StartsWith("135") || p.Province.Contains("云南"))),
"SELECT * FROM PATIENT WHERE ((AGE>20) AND (SEX=1)) AND ((TELEPHONE LIKE '135%') OR (PROVINCE LIKE '%云南%'))");
}
[TestMethod]
public void BaseUseDbParamter()
{
visitor = new WhereExpressionVisitor(false, false, true, ":", false);
{
string sql = visitor.ToSql<PatientInfo>(p => p.ID == "20");
var dbPramaters = visitor.GetDbParamter();
Assert.AreEqual(sql, "ID=:Param0");
Assert.IsTrue(dbPramaters != null && dbPramaters.Count == 1 && dbPramaters[":Param0"].ToString() == "'20'");
}
{
//Assert.ThrowsException<NotSupportedException>(() =>
//{
// visitor.ToSql<PatientInfo>(p => p.Age > 20
// && p.Sex == 1
// && (p.TelePhone.StartsWith("135") || p.Province.Contains("云南")));
//});
string sql = visitor.ToSql<PatientInfo>(p => p.Age > 20 && p.Sex == 1);
var dbPramaters = visitor.GetDbParamter();
Assert.AreEqual(sql, "(AGE>:Param0) AND (SEX=:Param1)");
Assert.IsTrue(dbPramaters != null
&& dbPramaters.Count == 2
&& Convert.ToInt32(dbPramaters[":Param0"].ToString()) == 20
&& Convert.ToInt32(dbPramaters[":Param1"].ToString()) == 1);
}
}
[TestMethod]
public void BaseUseAlias()
{
visitor = new WhereExpressionVisitor(false, false, false, "", true);
/*单条件*/
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.Age > 20), "p.AGE>20");
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.Age >= 20), "p.AGE>=20");
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.Age == 20), "p.AGE=20");
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.Age != 20), "p.AGE<>20");
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.Age < 20), "p.AGE<20");
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.Age <= 20), "p.AGE<=20");
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.TelePhone.StartsWith("135")), "p.TELEPHONE LIKE '135%'");
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.TelePhone.EndsWith("135")), "p.TELEPHONE LIKE '%135'");
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.TelePhone.Contains("135")), "p.TELEPHONE LIKE '%135%'");
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.TelePhone.Equals("w")), "p.TELEPHONE='w'");
/*多条件*/
Assert.AreEqual(
visitor.ToSql<PatientInfo>(
p => p.Age > 20 && p.Sex == 1),
"(p.AGE>20) AND (p.SEX=1)");
Assert.AreEqual(
visitor.ToSql<PatientInfo>(
p => p.Age > 20 && p.Sex == 1 && p.TelePhone.StartsWith("135")),
"((p.AGE>20) AND (p.SEX=1)) AND (p.TELEPHONE LIKE '135%')");
Assert.AreEqual(
visitor.ToSql<PatientInfo>(
p => p.Age > 20 && p.Sex == 1 && (p.TelePhone.StartsWith("135") || p.Province.Contains("云南"))),
"((p.AGE>20) AND (p.SEX=1)) AND ((p.TELEPHONE LIKE '135%') OR (p.PROVINCE LIKE '%云南%'))");
}
#endregion
}
}
TwoParamVisitorUnitTest：两参数流程流程测试
using FXY.Code.ORM.ExpressionVisit;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System;
namespace FXY.Code.ORM.ExpressionVisit.Test
{
[TestClass]
public class TwoParamVisitorUnitTest
{
private WhereExpressionVisitor visitor = new WhereExpressionVisitor();
#region 两参数测试
[TestMethod]
public void BaseUseColumnMapAndFullQuery()
{
visitor = new WhereExpressionVisitor(true, true, false, "", false);
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.ID == "20"), "SELECT * FROM PATIENT WHERE PATIENT_ID='20'");
Assert.AreEqual(
visitor.ToSql<PatientInfo>(p => p.Age > 20 && p.Sex == 1),
"SELECT * FROM PATIENT WHERE (PATIENT_AGE>20) AND (PATIENT_SEX=1)");
Assert.AreEqual(
visitor.ToSql<PatientInfo>(p => p.Age > 20
&& p.Sex == 1
&& p.TelePhone.StartsWith("135")),
"SELECT * FROM PATIENT WHERE ((PATIENT_AGE>20) AND (PATIENT_SEX=1)) AND (PATIENT_TELEPHONE LIKE '135%')");
Assert.AreEqual(
visitor.ToSql<PatientInfo>(p => p.Age > 20
&& p.Sex == 1
&& (p.TelePhone.StartsWith("135") || p.Province.Contains("云南"))),
"SELECT * FROM PATIENT WHERE ((PATIENT_AGE>20) AND (PATIENT_SEX=1)) AND ((PATIENT_TELEPHONE LIKE '135%') OR (PATIENT_PROVINCE LIKE '%云南%'))");
}
[TestMethod]
public void BaseUseColumnMapAndDbParamter()
{
visitor = new WhereExpressionVisitor(true, false, true, ":", false);
{
string sql = visitor.ToSql<PatientInfo>(p => p.ID == "20");
var dbPramaters = visitor.GetDbParamter();
Assert.AreEqual(sql, "PATIENT_ID=:Param0");
Assert.IsTrue(dbPramaters != null && dbPramaters.Count == 1 && dbPramaters[":Param0"].ToString() == "'20'");
}
{
//Assert.ThrowsException<NotSupportedException>(() =>
//{
// visitor.ToSql<PatientInfo>(p => p.Age > 20
// && p.Sex == 1
// && (p.TelePhone.StartsWith("135") || p.Province.Contains("云南")));
//});
string sql = visitor.ToSql<PatientInfo>(p => p.Age > 20 && p.Sex == 1);
var dbPramaters = visitor.GetDbParamter();
Assert.AreEqual(sql, "(PATIENT_AGE>:Param0) AND (PATIENT_SEX=:Param1)");
Assert.IsTrue(dbPramaters != null
&& dbPramaters.Count == 2
&& Convert.ToInt32(dbPramaters[":Param0"].ToString()) == 20
&& Convert.ToInt32(dbPramaters[":Param1"].ToString()) == 1);
}
}
[TestMethod]
public void BaseUseColumnMapAndAlias()
{
visitor = new WhereExpressionVisitor(true, false, false, "", true);
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.ID == "20"), "p.PATIENT_ID='20'");
Assert.AreEqual(
visitor.ToSql<PatientInfo>(p => p.Age > 20 && p.Sex == 1),
"(p.PATIENT_AGE>20) AND (p.PATIENT_SEX=1)");
Assert.AreEqual(
visitor.ToSql<PatientInfo>(p => p.Age > 20
&& p.Sex == 1
&& p.TelePhone.StartsWith("135")),
"((p.PATIENT_AGE>20) AND (p.PATIENT_SEX=1)) AND (p.PATIENT_TELEPHONE LIKE '135%')");
Assert.AreEqual(
visitor.ToSql<PatientInfo>(p => p.Age > 20
&& p.Sex == 1
&& (p.TelePhone.StartsWith("135") || p.Province.Contains("云南"))),
"((p.PATIENT_AGE>20) AND (p.PATIENT_SEX=1)) AND ((p.PATIENT_TELEPHONE LIKE '135%') OR (p.PATIENT_PROVINCE LIKE '%云南%'))");
}
[TestMethod]
public void BaseGenetateFullQueryAndDbParamter()
{
visitor = new WhereExpressionVisitor(false, true, true, ":", false);
{
string sql = visitor.ToSql<PatientInfo>(p => p.ID == "20");
var dbPramaters = visitor.GetDbParamter();
Assert.AreEqual(sql, "SELECT * FROM PATIENT WHERE ID=:Param0");
Assert.IsTrue(dbPramaters != null && dbPramaters.Count == 1 && dbPramaters[":Param0"].ToString() == "'20'");
}
{
//Assert.ThrowsException<NotSupportedException>(() =>
//{
// visitor.ToSql<PatientInfo>(p => p.Age > 20
// && p.Sex == 1
// && (p.TelePhone.StartsWith("135") || p.Province.Contains("云南")));
//});
string sql = visitor.ToSql<PatientInfo>(p => p.Age > 20 && p.Sex == 1);
var dbPramaters = visitor.GetDbParamter();
Assert.AreEqual(sql, "SELECT * FROM PATIENT WHERE (AGE>:Param0) AND (SEX=:Param1)");
Assert.IsTrue(dbPramaters != null
&& dbPramaters.Count == 2
&& Convert.ToInt32(dbPramaters[":Param0"].ToString()) == 20
&& Convert.ToInt32(dbPramaters[":Param1"].ToString()) == 1);
}
}
[TestMethod]
public void BaseGenetateFullQueryAndUseAlias()
{
visitor = new WhereExpressionVisitor(false, true, false, "", true);
/*不启用字段映射，不生成完整查询语句，不使用参数化，使用表别名，单条件*/
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.Age > 20), "SELECT * FROM PATIENT p WHERE p.AGE>20");
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.Age >= 20), "SELECT * FROM PATIENT p WHERE p.AGE>=20");
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.Age == 20), "SELECT * FROM PATIENT p WHERE p.AGE=20");
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.Age != 20), "SELECT * FROM PATIENT p WHERE p.AGE<>20");
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.Age < 20), "SELECT * FROM PATIENT p WHERE p.AGE<20");
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.Age <= 20), "SELECT * FROM PATIENT p WHERE p.AGE<=20");
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.TelePhone.StartsWith("135")), "SELECT * FROM PATIENT p WHERE p.TELEPHONE LIKE '135%'");
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.TelePhone.EndsWith("135")), "SELECT * FROM PATIENT p WHERE p.TELEPHONE LIKE '%135'");
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.TelePhone.Contains("135")), "SELECT * FROM PATIENT p WHERE p.TELEPHONE LIKE '%135%'");
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.TelePhone.Equals("w")), "SELECT * FROM PATIENT p WHERE p.TELEPHONE='w'");
/*不启用字段映射，不生成完整查询语句，不使用参数化，使用表别名，多条件*/
Assert.AreEqual(
visitor.ToSql<PatientInfo>(
p => p.Age > 20 && p.Sex == 1),
"SELECT * FROM PATIENT p WHERE (p.AGE>20) AND (p.SEX=1)");
Assert.AreEqual(
visitor.ToSql<PatientInfo>(
p => p.Age > 20 && p.Sex == 1 && p.TelePhone.StartsWith("135")),
"SELECT * FROM PATIENT p WHERE ((p.AGE>20) AND (p.SEX=1)) AND (p.TELEPHONE LIKE '135%')");
Assert.AreEqual(
visitor.ToSql<PatientInfo>(
p => p.Age > 20 && p.Sex == 1 && (p.TelePhone.StartsWith("135") || p.Province.Contains("云南"))),
"SELECT * FROM PATIENT p WHERE ((p.AGE>20) AND (p.SEX=1)) AND ((p.TELEPHONE LIKE '135%') OR (p.PROVINCE LIKE '%云南%'))");
}
[TestMethod]
public void BaseUseDbParamterAndUseAlias()
{
visitor = new WhereExpressionVisitor(false, false, true, ":", true);
{
string sql = visitor.ToSql<PatientInfo>(p => p.ID == "20");
var dbPramaters = visitor.GetDbParamter();
Assert.AreEqual(sql, "p.ID=:Param0");
Assert.IsTrue(dbPramaters != null && dbPramaters.Count == 1 && dbPramaters[":Param0"].ToString() == "'20'");
}
{
//Assert.ThrowsException<NotSupportedException>(() =>
//{
// visitor.ToSql<PatientInfo>(p => p.Age > 20
// && p.Sex == 1
// && (p.TelePhone.StartsWith("135") || p.Province.Contains("云南")));
//});
string sql = visitor.ToSql<PatientInfo>(p => p.Age > 20 && p.Sex == 1);
var dbPramaters = visitor.GetDbParamter();
Assert.AreEqual(sql, "(p.AGE>:Param0) AND (p.SEX=:Param1)");
Assert.IsTrue(dbPramaters != null
&& dbPramaters.Count == 2
&& Convert.ToInt32(dbPramaters[":Param0"].ToString()) == 20
&& Convert.ToInt32(dbPramaters[":Param1"].ToString()) == 1);
}
}
#endregion
}
}
ThreeParamVisitorUnitTest：三参数基本流程测试
using FXY.Code.ORM.ExpressionVisit;
using Microsoft.VisualStudio.TestTools.UnitTesting;
namespace FXY.Code.ORM.ExpressionVisit.Test
{
[TestClass]
public class ThreeParamVisitorUnitTest
{
private WhereExpressionVisitor visitor = new WhereExpressionVisitor();
#region 三参数测试
[TestMethod]
public void BaseUseColumnMapAndFullQueryAndDbParamter()
{
visitor = new WhereExpressionVisitor(true, true, true, ":", false);
string sql = visitor.ToSql<PatientInfo>(p => p.ID == "20");
var dbPramaters = visitor.GetDbParamter();
Assert.AreEqual(sql, "SELECT * FROM PATIENT WHERE PATIENT_ID=:Param0");
Assert.IsTrue(dbPramaters != null && dbPramaters.Count == 1 && dbPramaters[":Param0"].ToString() == "'20'");
}
[TestMethod]
public void BaseUseColumnMapAndFullQueryAndAlias()
{
visitor = new WhereExpressionVisitor(true, true, false, "", true);
string sql = visitor.ToSql<PatientInfo>(p => p.ID == "20");
Assert.AreEqual(sql, "SELECT * FROM PATIENT p WHERE p.PATIENT_ID='20'");
}
[TestMethod]
public void BaseUseFullQueryAndDbParamterAndAlias()
{
visitor = new WhereExpressionVisitor(false, true, true, ":", true);
string sql = visitor.ToSql<PatientInfo>(p => p.ID == "20");
var dbPramaters = visitor.GetDbParamter();
Assert.AreEqual(sql, "SELECT * FROM PATIENT p WHERE p.ID=:Param0");
Assert.IsTrue(dbPramaters != null && dbPramaters.Count == 1 && dbPramaters[":Param0"].ToString() == "'20'");
}
[TestMethod]
public void BaseUseColumnMapAndDbParamterAndAlias()
{
visitor = new WhereExpressionVisitor(true, false, true, ":", true);
string sql = visitor.ToSql<PatientInfo>(p => p.ID == "20");
var dbPramaters = visitor.GetDbParamter();
Assert.AreEqual(sql, "p.PATIENT_ID=:Param0");
Assert.IsTrue(dbPramaters != null && dbPramaters.Count == 1 && dbPramaters[":Param0"].ToString() == "'20'");
}
#endregion
}
}
FourParamVisitorUnitTest：四参数基本流程测试
using FXY.Code.ORM.ExpressionVisit;
using Microsoft.VisualStudio.TestTools.UnitTesting;
namespace FXY.Code.ORM.ExpressionVisit.Test
{
[TestClass]
public class FourParamVisitorUnitTest
{
private WhereExpressionVisitor visitor = new WhereExpressionVisitor();
#region 四参数测试
[TestMethod]
public void BaseUseColumnMapAndFullQueryAndDbParamterAndAlias()
{
visitor = new WhereExpressionVisitor(true, true, true, ":", true);
string sql = visitor.ToSql<PatientInfo>(p => p.ID == "20");
var dbPramaters = visitor.GetDbParamter();
Assert.AreEqual(sql, "SELECT * FROM PATIENT p WHERE p.PATIENT_ID=:Param0");
Assert.IsTrue(dbPramaters != null && dbPramaters.Count == 1 && dbPramaters[":Param0"].ToString() == "'20'");
}
#endregion
}
}
其他测试
CoalesceUnitTest：二元空值运算符，格式为：a??b
using FXY.Code.ORM.ExpressionVisit;
using Microsoft.VisualStudio.TestTools.UnitTesting;
namespace FXY.Code.ORM.ExpressionVisit.Test
{
[TestClass]
public class CoalesceUnitTest
{
private WhereExpressionVisitor visitor = new WhereExpressionVisitor(true, false, false, "", false);
[TestMethod]
public void CoalesceTest()
{
Assert.AreEqual(
visitor.ToSql<PatientInfo>(p => p.City == (p.Province ?? "成都")),
"PATIENT_CITY= NVL(PATIENT_PROVINCE,'成都')");
}
}
}
ConditionalExpressionUnitTest：三元条件运算符，语法为：条件表达式？表达式1：表达式2
using FXY.Code.ORM.ExpressionVisit.Test;
using FXY.Code.ORM.ExpressionVisit;
using Microsoft.VisualStudio.TestTools.UnitTesting;
namespace FXY.Code.ORM.ExpressionVisit.Test
{
[TestClass]
public class ConditionalExpressionUnitTest
{
private WhereExpressionVisitor visitor = new WhereExpressionVisitor(true, false, false, "", false);
[TestMethod]
public void BaseTest()
{
Assert.AreEqual(
visitor.ToSql<PatientInfo>(p => p.Age == (p.Sex == 1 ? 22 : 20)),
"PATIENT_AGE= (CASE PATIENT_SEX WHEN 1 THEN 22 ELSE 20 END)");
Assert.AreEqual(
visitor.ToSql<PatientInfo>(p => p.City == (p.Sex == 1 ? "成都" : "昆明")),
"PATIENT_CITY= (CASE PATIENT_SEX WHEN 1 THEN '成都' ELSE '昆明' END)");
}
}
}
DateTimeCompareUnitTest：时间比较
using FXY.Code.ORM.ExpressionVisit;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System;
namespace FXY.Code.ORM.ExpressionVisit.Test
{
[TestClass]
public class DateTimeCompareUnitTest
{
private WhereExpressionVisitor visitor = new WhereExpressionVisitor(true, false, false, "", false);
[TestMethod]
public void BaseDatetieCompareByNew1()
{
Assert.AreEqual(
visitor.ToSql<PatientInfo>(p => p.Birthday > new DateTime(1900, 01, 01)),
"PATIENT_BIRTHDAY>TO_DATE('1900-01-01 00:00:00','yyyy-MM-dd hh24:mi:ss')");
}
[TestMethod]
public void BaseDatetieCompareByNew2()
{
Assert.AreEqual(
visitor.ToSql<PatientInfo>(p => p.Birthday > new DateTime(1900, 01, 01, 2, 3, 4)),
"PATIENT_BIRTHDAY>TO_DATE('1900-01-01 02:03:04','yyyy-MM-dd hh24:mi:ss')");
}
[TestMethod]
public void BaseDatetieCompareByConstant1()
{
DateTime dateTime = new DateTime(1900, 01, 01);
Assert.AreEqual(
visitor.ToSql<PatientInfo>(p => p.Birthday > dateTime),
"PATIENT_BIRTHDAY>TO_DATE('1900-01-01 00:00:00','yyyy-MM-dd hh24:mi:ss')");
}
[TestMethod]
public void BaseDatetieCompareByConstant2()
{
DateTime dateTime = new DateTime(1900, 01, 01, 2, 3, 4);
Assert.AreEqual(
visitor.ToSql<PatientInfo>(p => p.Birthday > dateTime),
"PATIENT_BIRTHDAY>TO_DATE('1900-01-01 02:03:04','yyyy-MM-dd hh24:mi:ss')");
}
[TestMethod]
public void BaseDateTimeCanNull()
{
DateTime? dateTime = new DateTime(1900, 01, 01, 2, 3, 4);
Assert.AreEqual(
visitor.ToSql<PatientInfo>(p => p.Birthday > dateTime),
"PATIENT_BIRTHDAY>TO_DATE('1900-01-01 02:03:04','yyyy-MM-dd hh24:mi:ss')");
dateTime = null;
Assert.ThrowsException<NotSupportedException>(() =>
{
Assert.AreEqual(
visitor.ToSql<PatientInfo>(p => p.Birthday > dateTime),
"PATIENT_BIRTHDAY>TO_DATE('1900-01-01 02:03:04','yyyy-MM-dd hh24:mi:ss')");
});
}
}
}
StringConcatVisitorUnitTest：字符串连接测试
using FXY.Code.ORM.ExpressionVisit;
using Microsoft.VisualStudio.TestTools.UnitTesting;
namespace FXY.Code.ORM.ExpressionVisit.Test
{
[TestClass]
public class StringConcatVisitorUnitTest
{
private WhereExpressionVisitor visitor = new WhereExpressionVisitor();
[TestMethod]
public void OneStringConcat()
{
visitor = new WhereExpressionVisitor(true, true, false, "", true);
string id = "1";
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.ID == "0_" + id),
"SELECT * FROM PATIENT p WHERE p.PATIENT_ID='0_1'");
}
[TestMethod]
public void TwoStringConcat()
{
visitor = new WhereExpressionVisitor(true, true, false, "", true);
string id1 = "1";
string id2 = "2";
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.ID == "0_" + id1 + "_" + id2),
"SELECT * FROM PATIENT p WHERE p.PATIENT_ID='0_1_2'");
}
[TestMethod]
public void ThreeStringConcat()
{
visitor = new WhereExpressionVisitor(true, true, false, "", true);
string id1 = "1";
string id2 = "2";
string id3 = "3";
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.ID == "0_" + id1 + "_" + id2 + "_" + id3),
"SELECT * FROM PATIENT p WHERE p.PATIENT_ID='0_1_2_3'");
}
[TestMethod]
public void FourStringConcat()
{
visitor = new WhereExpressionVisitor(true, true, false, "", true);
string id1 = "1";
string id2 = "2";
string id3 = "3";
string id4 = "4";
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.ID == "0_" + id1 + "_" + id2 + "_" + id3 + "_" + id4),
"SELECT * FROM PATIENT p WHERE p.PATIENT_ID='0_1_2_3_4'");
}
[TestMethod]
public void OneObjectConcat()
{
visitor = new WhereExpressionVisitor(true, true, false, "", true);
object id = "1";
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.ID == "0_" + id),
"SELECT * FROM PATIENT p WHERE p.PATIENT_ID='0_1'");
}
[TestMethod]
public void TwoObjectConcat()
{
visitor = new WhereExpressionVisitor(true, true, false, "", true);
object id1 = "1";
object id2 = "2";
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.ID == "0_" + id1 + "_" + id2),
"SELECT * FROM PATIENT p WHERE p.PATIENT_ID='0_1_2'");
}
[TestMethod]
public void OneIntConcat()
{
visitor = new WhereExpressionVisitor(true, true, false, "", true);
int id = 1;
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.ID == "0_" + id),
"SELECT * FROM PATIENT p WHERE p.PATIENT_ID='0_1'");
}
[TestMethod]
public void TwoIntConcat()
{
visitor = new WhereExpressionVisitor(true, true, false, "", true);
int id1 = 1;
int id2 = 2;
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.ID == "0_" + id1 + "_" + id2),
"SELECT * FROM PATIENT p WHERE p.PATIENT_ID='0_1_2'");
}
}
}
StringFormatVisitorUnitTest：字符串内插测试
using FXY.Code.ORM.ExpressionVisit;
using Microsoft.VisualStudio.TestTools.UnitTesting;
namespace FXY.Code.ORM.ExpressionVisit.Test
{
[TestClass]
public class StringFormatVisitorUnitTest
{
private WhereExpressionVisitor visitor = new WhereExpressionVisitor();
[TestMethod]
public void ExtensionUseVariableConstant()
{
visitor = new WhereExpressionVisitor(true, true, false, "", true);
string id = "1";
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.ID == id),
"SELECT * FROM PATIENT p WHERE p.PATIENT_ID='1'");
}
[TestMethod]
public void ExtensionStringInterpolation()
{
visitor = new WhereExpressionVisitor(true, true, false, "", true);
string id = "1";
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.ID == $"1_{id}"),
"SELECT * FROM PATIENT p WHERE p.PATIENT_ID='1_1'");
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.ID == $"1_{id}_{id}"),
"SELECT * FROM PATIENT p WHERE p.PATIENT_ID='1_1_1'");
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.ID == $"1_{id}_{id}_{id}"),
"SELECT * FROM PATIENT p WHERE p.PATIENT_ID='1_1_1_1'");
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.ID == $"1_{id}_{id}_{id}_{id}"),
"SELECT * FROM PATIENT p WHERE p.PATIENT_ID='1_1_1_1_1'");
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.ID == $"1_{id}_{id}_{id}_{id}_{id}"),
"SELECT * FROM PATIENT p WHERE p.PATIENT_ID='1_1_1_1_1_1'");
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.ID == $"1_{id}_{id}_{id}_{id}_{id}_{id}"),
"SELECT * FROM PATIENT p WHERE p.PATIENT_ID='1_1_1_1_1_1_1'");
}
}
}
StringJoinVisitorUnitTest：string.Join函数测试
using FXY.Code.ORM.ExpressionVisit;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System.Collections.Generic;
namespace FXY.Code.ORM.ExpressionVisit.Test
{
[TestClass]
public class StringJoinVisitorUnitTest
{
private WhereExpressionVisitor visitor = new WhereExpressionVisitor();
public void StringJoin()
{
visitor = new WhereExpressionVisitor(true, true, false, "", true);
var list = new List<string>() { "1", "2", "3" };
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.ID == string.Join(",", list)),
"SELECT * FROM PATIENT p WHERE p.PATIENT_ID='1,2,3'");
}
public void IntJoin()
{
visitor = new WhereExpressionVisitor(true, true, false, "", true);
var list = new List<int>() { 1, 2, 3 };
Assert.AreEqual(visitor.ToSql<PatientInfo>(p => p.ID == string.Join(",", list)),
"SELECT * FROM PATIENT p WHERE p.PATIENT_ID='1,2,3'");
}
}
}
单元测试结果
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