79 lines
1.8 KiB
C#
79 lines
1.8 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Linq.Expressions;
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using System.Text;
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namespace SqlSugar
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{
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public class SubTop : ISubOperation
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{
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public bool HasWhere
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{
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get; set;
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}
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public ExpressionContext Context
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{
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get; set;
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}
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public Expression Expression
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{
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get; set;
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}
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public string Name
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{
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get
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{
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return "Top";
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}
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}
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public int Sort
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{
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get
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{
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if (this.Context is SqlServerExpressionContext || this.Context.GetType().Name.Contains("Access"))
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{
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return 150;
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}
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else if (this.Context is OracleExpressionContext) {
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return 401;
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}
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else
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{
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return 490;
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}
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}
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}
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public string GetValue(Expression expression)
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{
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if (this.Context is SqlServerExpressionContext|| this.Context.GetType().Name.Contains("Access"))
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{
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return "TOP 1";
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}
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else if (this.Context is OracleExpressionContext)
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{
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return (HasWhere?"AND":"WHERE")+ " ROWNUM=1";
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}
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else if (this.Context is PostgreSQLExpressionContext||this.Context?.SugarContext?.Context?.CurrentConnectionConfig?.MoreSettings?.DatabaseModel==DbType.PostgreSQL)
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{
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return "limit 1";
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}
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else if (this.Context.GetLimit()!=null)
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{
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return this.Context.GetLimit();
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}
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else
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{
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return "limit 0,1";
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}
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}
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}
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}
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