Relation "department" 不存在 EF Core 迁移错误
Relation "department" does not exist EF Core migration error
我正在关注 EF Core with MVC tutorial on docs.microsoft.com。
我有以下迁移：
using Microsoft.EntityFrameworkCore.Migrations;
using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
#nullable disable
namespace ContosoUniversity.Migrations
{
public partial class ComplexDataModel : Migration
{
protected override void Up(MigrationBuilder migrationBuilder)
{
migrationBuilder.AlterColumn<DateTime>(
name: "EnrollmentDate",
table: "Student",
type: "timestamp with time zone",
nullable: true,
oldClrType: typeof(DateTime),
oldType: "timestamp with time zone"
);
migrationBuilder.AlterColumn<string>(
name: "Title",
table: "Course",
type: "character varying(50)",
maxLength: 50,
nullable: false,
oldClrType: typeof(string),
oldType: "text"
);
// migrationBuilder.AddColumn<int>(
// name: "DepartmentID",
// table: "Course",
// type: "integer",
// nullable: false,
// defaultValue: 0
// );
migrationBuilder.CreateTable(
name: "Instructor",
columns: table =>
new
{
ID = table
.Column<int>(type: "integer", nullable: false)
.Annotation(
"Npgsql:ValueGenerationStrategy",
NpgsqlValueGenerationStrategy.IdentityByDefaultColumn
),
LastName = table.Column<string>(
type: "character varying(50)",
maxLength: 50,
nullable: false
),
FirstName = table.Column<string>(
type: "character varying(50)",
maxLength: 50,
nullable: false
),
HireDate = table.Column<DateTime>(
type: "timestamp with time zone",
nullable: true
)
},
constraints: table => table.PrimaryKey("PK_Instructor", x => x.ID)
);
migrationBuilder.CreateTable(
name: "CourseAssignment",
columns: table =>
new
{
InstructorID = table.Column<int>(type: "integer", nullable: false),
CourseID = table.Column<int>(type: "integer", nullable: false)
},
constraints: table =>
{
table.PrimaryKey(
"PK_CourseAssignment",
x => new { x.CourseID, x.InstructorID }
);
table.ForeignKey(
name: "FK_CourseAssignment_Course_CourseID",
column: x => x.CourseID,
principalTable: "Course",
principalColumn: "CourseID",
onDelete: ReferentialAction.Cascade
);
table.ForeignKey(
name: "FK_CourseAssignment_Instructor_InstructorID",
column: x => x.InstructorID,
principalTable: "Instructor",
principalColumn: "ID",
onDelete: ReferentialAction.Cascade
);
}
);
migrationBuilder.CreateTable(
name: "Department",
columns: table =>
new
{
DepartmentID = table
.Column<int>(type: "integer", nullable: false)
.Annotation(
"Npgsql:ValueGenerationStrategy",
NpgsqlValueGenerationStrategy.IdentityByDefaultColumn
),
Name = table.Column<string>(
type: "character varying(50)",
maxLength: 50,
nullable: false
),
Budget = table.Column<decimal>(type: "money", nullable: false),
StartDate = table.Column<DateTime>(
type: "timestamp with time zone",
nullable: false
),
InstructorID = table.Column<int>(type: "integer", nullable: true)
},
constraints: table =>
{
table.PrimaryKey("PK_Department", x => x.DepartmentID);
table.ForeignKey(
name: "FK_Department_Instructor_InstructorID",
column: x => x.InstructorID,
principalTable: "Instructor",
principalColumn: "ID"
);
}
);
migrationBuilder.Sql(
"INSERT INTO Department (Name, Budget, StartDate) VALUES ('Temp', 0.00, GETDATE())"
);
// Default value for FK points to department created above, with
// defaultValue changed to 1 in following AddColumn statement.
migrationBuilder.AddColumn<int>(
name: "DepartmentID",
table: "Course",
nullable: false,
defaultValue: 1
);
migrationBuilder.CreateTable(
name: "OfficeAssignment",
columns: table =>
new
{
InstructorID = table.Column<int>(type: "integer", nullable: false),
Location = table.Column<string>(
type: "character varying(50)",
maxLength: 50,
nullable: false
)
},
constraints: table =>
{
table.PrimaryKey("PK_OfficeAssignment", x => x.InstructorID);
table.ForeignKey(
name: "FK_OfficeAssignment_Instructor_InstructorID",
column: x => x.InstructorID,
principalTable: "Instructor",
principalColumn: "ID",
onDelete: ReferentialAction.Cascade
);
}
);
migrationBuilder.CreateIndex(
name: "IX_Course_DepartmentID",
table: "Course",
column: "DepartmentID"
);
migrationBuilder.CreateIndex(
name: "IX_CourseAssignment_InstructorID",
table: "CourseAssignment",
column: "InstructorID"
);
migrationBuilder.CreateIndex(
name: "IX_Department_InstructorID",
table: "Department",
column: "InstructorID"
);
migrationBuilder.AddForeignKey(
name: "FK_Course_Department_DepartmentID",
table: "Course",
column: "DepartmentID",
principalTable: "Department",
principalColumn: "DepartmentID",
onDelete: ReferentialAction.Cascade
);
}
protected override void Down(MigrationBuilder migrationBuilder)
{
migrationBuilder.DropForeignKey(
name: "FK_Course_Department_DepartmentID",
table: "Course"
);
migrationBuilder.DropTable(name: "CourseAssignment");
migrationBuilder.DropTable(name: "Department");
migrationBuilder.DropTable(name: "OfficeAssignment");
migrationBuilder.DropTable(name: "Instructor");
migrationBuilder.DropIndex(name: "IX_Course_DepartmentID", table: "Course");
migrationBuilder.DropColumn(name: "DepartmentID", table: "Course");
migrationBuilder.AlterColumn<DateTime>(
name: "EnrollmentDate",
table: "Student",
type: "timestamp with time zone",
nullable: false,
defaultValue: new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
oldClrType: typeof(DateTime),
oldType: "timestamp with time zone",
oldNullable: true
);
migrationBuilder.AlterColumn<string>(
name: "Title",
table: "Course",
type: "text",
nullable: false,
oldClrType: typeof(string),
oldType: "character varying(50)",
oldMaxLength: 50
);
}
}
}
并且在尝试执行它时（数据库被预先删除所以它被重新创建）我得到以下 PostgreSQL 错误/.NET 堆栈跟踪：
dotnet ef database update
Build started...
Build succeeded.
info: Microsoft.EntityFrameworkCore.Infrastructure[10403]
Entity Framework Core 6.0.2 initialized 'SchoolContext' using provider 'Npgsql.EntityFrameworkCore.PostgreSQL:6.0.2+854d2438884c0bf3a4ba8ccde2c47f7ba1ea3a4c' with options: None
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (26,524ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
CREATE DATABASE contoso_university;
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (188ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
CREATE TABLE "__EFMigrationsHistory" (
"MigrationId" character varying(150) NOT NULL,
"ProductVersion" character varying(32) NOT NULL,
CONSTRAINT "PK___EFMigrationsHistory" PRIMARY KEY ("MigrationId")
);
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (39ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
SELECT EXISTS (SELECT 1 FROM pg_catalog.pg_class c JOIN pg_catalog.pg_namespace n ON n.oid=c.relnamespace WHERE c.relname='__EFMigrationsHistory');
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (2ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
SELECT "MigrationId", "ProductVersion"
FROM "__EFMigrationsHistory"
ORDER BY "MigrationId";
info: Microsoft.EntityFrameworkCore.Migrations[20402]
Applying migration '20220525123835_InitialCreate'.
Applying migration '20220525123835_InitialCreate'.
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (348ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
CREATE TABLE "Course" (
"CourseID" integer NOT NULL,
"Title" text NOT NULL,
"Credits" integer NOT NULL,
CONSTRAINT "PK_Course" PRIMARY KEY ("CourseID")
);
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (281ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
CREATE TABLE "Student" (
"ID" integer GENERATED BY DEFAULT AS IDENTITY,
"LastName" text NOT NULL,
"FirstMidName" text NOT NULL,
"EnrollmentDate" timestamp with time zone NOT NULL,
CONSTRAINT "PK_Student" PRIMARY KEY ("ID")
);
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (95ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
CREATE TABLE "Enrollment" (
"EnrollmentID" integer GENERATED BY DEFAULT AS IDENTITY,
"CourseID" integer NOT NULL,
"StudentID" integer NOT NULL,
"Grade" integer NULL,
CONSTRAINT "PK_Enrollment" PRIMARY KEY ("EnrollmentID"),
CONSTRAINT "FK_Enrollment_Course_CourseID" FOREIGN KEY ("CourseID") REFERENCES "Course" ("CourseID") ON DELETE CASCADE,
CONSTRAINT "FK_Enrollment_Student_StudentID" FOREIGN KEY ("StudentID") REFERENCES "Student" ("ID") ON DELETE CASCADE
);
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (104ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
CREATE INDEX "IX_Enrollment_CourseID" ON "Enrollment" ("CourseID");
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (187ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
CREATE INDEX "IX_Enrollment_StudentID" ON "Enrollment" ("StudentID");
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (2ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
INSERT INTO "__EFMigrationsHistory" ("MigrationId", "ProductVersion")
VALUES ('20220525123835_InitialCreate', '6.0.2');
info: Microsoft.EntityFrameworkCore.Migrations[20402]
Applying migration '20220525130657_MaxLengthOnNames'.
Applying migration '20220525130657_MaxLengthOnNames'.
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (525ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
ALTER TABLE "Student" ALTER COLUMN "LastName" TYPE character varying(50);
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (175ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
ALTER TABLE "Student" ALTER COLUMN "FirstMidName" TYPE character varying(50);
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (1ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
INSERT INTO "__EFMigrationsHistory" ("MigrationId", "ProductVersion")
VALUES ('20220525130657_MaxLengthOnNames', '6.0.2');
Applying migration '20220525140736_ColumnFirstName'.
info: Microsoft.EntityFrameworkCore.Migrations[20402]
Applying migration '20220525140736_ColumnFirstName'.
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (1ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
ALTER TABLE "Student" RENAME COLUMN "FirstMidName" TO "FirstName";
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (0ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
INSERT INTO "__EFMigrationsHistory" ("MigrationId", "ProductVersion")
VALUES ('20220525140736_ColumnFirstName', '6.0.2');
Applying migration '20220526192225_ComplexDataModel'.info: Microsoft.EntityFrameworkCore.Migrations[20402]
Applying migration '20220526192225_ComplexDataModel'.
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (1ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
ALTER TABLE "Student" ALTER COLUMN "EnrollmentDate" DROP NOT NULL;
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (145ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
ALTER TABLE "Course" ALTER COLUMN "Title" TYPE character varying(50);
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (83ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
CREATE TABLE "Instructor" (
"ID" integer GENERATED BY DEFAULT AS IDENTITY,
"LastName" character varying(50) NOT NULL,
"FirstName" character varying(50) NOT NULL,
"HireDate" timestamp with time zone NULL,
CONSTRAINT "PK_Instructor" PRIMARY KEY ("ID")
);
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (70ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
CREATE TABLE "CourseAssignment" (
"InstructorID" integer NOT NULL,
"CourseID" integer NOT NULL,
CONSTRAINT "PK_CourseAssignment" PRIMARY KEY ("CourseID", "InstructorID"),
CONSTRAINT "FK_CourseAssignment_Course_CourseID" FOREIGN KEY ("CourseID") REFERENCES "Course" ("CourseID") ON DELETE CASCADE,
CONSTRAINT "FK_CourseAssignment_Instructor_InstructorID" FOREIGN KEY ("InstructorID") REFERENCES "Instructor" ("ID") ON DELETE CASCADE
);
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (93ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
CREATE TABLE "Department" (
"DepartmentID" integer GENERATED BY DEFAULT AS IDENTITY,
"Name" character varying(50) NOT NULL,
"Budget" money NOT NULL,
"StartDate" timestamp with time zone NOT NULL,
"InstructorID" integer NULL,
CONSTRAINT "PK_Department" PRIMARY KEY ("DepartmentID"),
CONSTRAINT "FK_Department_Instructor_InstructorID" FOREIGN KEY ("InstructorID") REFERENCES "Instructor" ("ID")
);
fail: Microsoft.EntityFrameworkCore.Database.Command[20102]
Failed executing DbCommand (6ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
INSERT INTO Department (Name, Budget, StartDate) VALUES ('Temp', 0.00, GETDATE())
Failed executing DbCommand (6ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
INSERT INTO Department (Name, Budget, StartDate) VALUES ('Temp', 0.00, GETDATE())
Npgsql.PostgresException (0x80004005): 42P01: relation "department" does not exist
POSITION: 13
at Npgsql.Internal.NpgsqlConnector.<ReadMessage>g__ReadMessageLong|213_0(NpgsqlConnector connector, Boolean async, DataRowLoadingMode dataRowLoadingMode, Boolean readingNotifications, Boolean isReadingPrependedMessage)
at Npgsql.NpgsqlDataReader.NextResult(Boolean async, Boolean isConsuming, CancellationToken cancellationToken)
at Npgsql.NpgsqlDataReader.NextResult()
at Npgsql.NpgsqlCommand.ExecuteReader(CommandBehavior behavior, Boolean async, CancellationToken cancellationToken)
at Npgsql.NpgsqlCommand.ExecuteReader(CommandBehavior behavior, Boolean async, CancellationToken cancellationToken)
at Npgsql.NpgsqlCommand.ExecuteNonQuery(Boolean async, CancellationToken cancellationToken)
at Npgsql.NpgsqlCommand.ExecuteNonQuery()
at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteNonQuery(RelationalCommandParameterObject parameterObject)
at Microsoft.EntityFrameworkCore.Migrations.MigrationCommand.ExecuteNonQuery(IRelationalConnection connection, IReadOnlyDictionary`2 parameterValues)
at Microsoft.EntityFrameworkCore.Migrations.Internal.MigrationCommandExecutor.ExecuteNonQuery(IEnumerable`1 migrationCommands, IRelationalConnection connection)
at Microsoft.EntityFrameworkCore.Migrations.Internal.Migrator.Migrate(String targetMigration)
at Microsoft.EntityFrameworkCore.Design.Internal.MigrationsOperations.UpdateDatabase(String targetMigration, String connectionString, String contextType)
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.UpdateDatabaseImpl(String targetMigration, String connectionString, String contextType)
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.UpdateDatabase.<>c__DisplayClass0_0.<.ctor>b__0()
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action)
Exception data:
Severity: ERROR
SqlState: 42P01
MessageText: relation "department" does not exist
Position: 13
File: parse_relation.c
Line: 1381
Routine: parserOpenTable
42P01: relation "department" does not exist
POSITION: 13
我不知道那个关系应该存在于何处，为什么不存在，你能帮帮我吗？
编辑：正如 Belayer 的 中正确指出的那样，错误的原因是 EF Core 在其中生成命令，它使用双引号将列和表的名称括起来。在编写普通 SQL 语句时，也必须使用双引号将名称括起来。
我刚刚粘贴了 MS 教程中的那一行，并且该教程是在考虑 SQL 服务器而不是 PostgreSQL 的情况下制作的。也就是说，像这样的案例正是为什么普通的 SQL 几乎总是不是一件好事。
您创建了 table "Department"，但随后使用了 table Department。 它们不一样。 Postgres 将所有 non-doubled 带引号 ("...") 的标识符折叠为小写（与 SQL 将它们折叠为大写的标准相反）但在标识符被双引号时保持准确的大小写。但是，当使用双引号创建时，您必须 always 在引用时使用双引号。
我正在关注 EF Core with MVC tutorial on docs.microsoft.com。
我有以下迁移：
using Microsoft.EntityFrameworkCore.Migrations;
using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
#nullable disable
namespace ContosoUniversity.Migrations
{
public partial class ComplexDataModel : Migration
{
protected override void Up(MigrationBuilder migrationBuilder)
{
migrationBuilder.AlterColumn<DateTime>(
name: "EnrollmentDate",
table: "Student",
type: "timestamp with time zone",
nullable: true,
oldClrType: typeof(DateTime),
oldType: "timestamp with time zone"
);
migrationBuilder.AlterColumn<string>(
name: "Title",
table: "Course",
type: "character varying(50)",
maxLength: 50,
nullable: false,
oldClrType: typeof(string),
oldType: "text"
);
// migrationBuilder.AddColumn<int>(
// name: "DepartmentID",
// table: "Course",
// type: "integer",
// nullable: false,
// defaultValue: 0
// );
migrationBuilder.CreateTable(
name: "Instructor",
columns: table =>
new
{
ID = table
.Column<int>(type: "integer", nullable: false)
.Annotation(
"Npgsql:ValueGenerationStrategy",
NpgsqlValueGenerationStrategy.IdentityByDefaultColumn
),
LastName = table.Column<string>(
type: "character varying(50)",
maxLength: 50,
nullable: false
),
FirstName = table.Column<string>(
type: "character varying(50)",
maxLength: 50,
nullable: false
),
HireDate = table.Column<DateTime>(
type: "timestamp with time zone",
nullable: true
)
},
constraints: table => table.PrimaryKey("PK_Instructor", x => x.ID)
);
migrationBuilder.CreateTable(
name: "CourseAssignment",
columns: table =>
new
{
InstructorID = table.Column<int>(type: "integer", nullable: false),
CourseID = table.Column<int>(type: "integer", nullable: false)
},
constraints: table =>
{
table.PrimaryKey(
"PK_CourseAssignment",
x => new { x.CourseID, x.InstructorID }
);
table.ForeignKey(
name: "FK_CourseAssignment_Course_CourseID",
column: x => x.CourseID,
principalTable: "Course",
principalColumn: "CourseID",
onDelete: ReferentialAction.Cascade
);
table.ForeignKey(
name: "FK_CourseAssignment_Instructor_InstructorID",
column: x => x.InstructorID,
principalTable: "Instructor",
principalColumn: "ID",
onDelete: ReferentialAction.Cascade
);
}
);
migrationBuilder.CreateTable(
name: "Department",
columns: table =>
new
{
DepartmentID = table
.Column<int>(type: "integer", nullable: false)
.Annotation(
"Npgsql:ValueGenerationStrategy",
NpgsqlValueGenerationStrategy.IdentityByDefaultColumn
),
Name = table.Column<string>(
type: "character varying(50)",
maxLength: 50,
nullable: false
),
Budget = table.Column<decimal>(type: "money", nullable: false),
StartDate = table.Column<DateTime>(
type: "timestamp with time zone",
nullable: false
),
InstructorID = table.Column<int>(type: "integer", nullable: true)
},
constraints: table =>
{
table.PrimaryKey("PK_Department", x => x.DepartmentID);
table.ForeignKey(
name: "FK_Department_Instructor_InstructorID",
column: x => x.InstructorID,
principalTable: "Instructor",
principalColumn: "ID"
);
}
);
migrationBuilder.Sql(
"INSERT INTO Department (Name, Budget, StartDate) VALUES ('Temp', 0.00, GETDATE())"
);
// Default value for FK points to department created above, with
// defaultValue changed to 1 in following AddColumn statement.
migrationBuilder.AddColumn<int>(
name: "DepartmentID",
table: "Course",
nullable: false,
defaultValue: 1
);
migrationBuilder.CreateTable(
name: "OfficeAssignment",
columns: table =>
new
{
InstructorID = table.Column<int>(type: "integer", nullable: false),
Location = table.Column<string>(
type: "character varying(50)",
maxLength: 50,
nullable: false
)
},
constraints: table =>
{
table.PrimaryKey("PK_OfficeAssignment", x => x.InstructorID);
table.ForeignKey(
name: "FK_OfficeAssignment_Instructor_InstructorID",
column: x => x.InstructorID,
principalTable: "Instructor",
principalColumn: "ID",
onDelete: ReferentialAction.Cascade
);
}
);
migrationBuilder.CreateIndex(
name: "IX_Course_DepartmentID",
table: "Course",
column: "DepartmentID"
);
migrationBuilder.CreateIndex(
name: "IX_CourseAssignment_InstructorID",
table: "CourseAssignment",
column: "InstructorID"
);
migrationBuilder.CreateIndex(
name: "IX_Department_InstructorID",
table: "Department",
column: "InstructorID"
);
migrationBuilder.AddForeignKey(
name: "FK_Course_Department_DepartmentID",
table: "Course",
column: "DepartmentID",
principalTable: "Department",
principalColumn: "DepartmentID",
onDelete: ReferentialAction.Cascade
);
}
protected override void Down(MigrationBuilder migrationBuilder)
{
migrationBuilder.DropForeignKey(
name: "FK_Course_Department_DepartmentID",
table: "Course"
);
migrationBuilder.DropTable(name: "CourseAssignment");
migrationBuilder.DropTable(name: "Department");
migrationBuilder.DropTable(name: "OfficeAssignment");
migrationBuilder.DropTable(name: "Instructor");
migrationBuilder.DropIndex(name: "IX_Course_DepartmentID", table: "Course");
migrationBuilder.DropColumn(name: "DepartmentID", table: "Course");
migrationBuilder.AlterColumn<DateTime>(
name: "EnrollmentDate",
table: "Student",
type: "timestamp with time zone",
nullable: false,
defaultValue: new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
oldClrType: typeof(DateTime),
oldType: "timestamp with time zone",
oldNullable: true
);
migrationBuilder.AlterColumn<string>(
name: "Title",
table: "Course",
type: "text",
nullable: false,
oldClrType: typeof(string),
oldType: "character varying(50)",
oldMaxLength: 50
);
}
}
}
并且在尝试执行它时（数据库被预先删除所以它被重新创建）我得到以下 PostgreSQL 错误/.NET 堆栈跟踪：
dotnet ef database update
Build started...
Build succeeded.
info: Microsoft.EntityFrameworkCore.Infrastructure[10403]
Entity Framework Core 6.0.2 initialized 'SchoolContext' using provider 'Npgsql.EntityFrameworkCore.PostgreSQL:6.0.2+854d2438884c0bf3a4ba8ccde2c47f7ba1ea3a4c' with options: None
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (26,524ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
CREATE DATABASE contoso_university;
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (188ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
CREATE TABLE "__EFMigrationsHistory" (
"MigrationId" character varying(150) NOT NULL,
"ProductVersion" character varying(32) NOT NULL,
CONSTRAINT "PK___EFMigrationsHistory" PRIMARY KEY ("MigrationId")
);
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (39ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
SELECT EXISTS (SELECT 1 FROM pg_catalog.pg_class c JOIN pg_catalog.pg_namespace n ON n.oid=c.relnamespace WHERE c.relname='__EFMigrationsHistory');
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (2ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
SELECT "MigrationId", "ProductVersion"
FROM "__EFMigrationsHistory"
ORDER BY "MigrationId";
info: Microsoft.EntityFrameworkCore.Migrations[20402]
Applying migration '20220525123835_InitialCreate'.
Applying migration '20220525123835_InitialCreate'.
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (348ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
CREATE TABLE "Course" (
"CourseID" integer NOT NULL,
"Title" text NOT NULL,
"Credits" integer NOT NULL,
CONSTRAINT "PK_Course" PRIMARY KEY ("CourseID")
);
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (281ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
CREATE TABLE "Student" (
"ID" integer GENERATED BY DEFAULT AS IDENTITY,
"LastName" text NOT NULL,
"FirstMidName" text NOT NULL,
"EnrollmentDate" timestamp with time zone NOT NULL,
CONSTRAINT "PK_Student" PRIMARY KEY ("ID")
);
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (95ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
CREATE TABLE "Enrollment" (
"EnrollmentID" integer GENERATED BY DEFAULT AS IDENTITY,
"CourseID" integer NOT NULL,
"StudentID" integer NOT NULL,
"Grade" integer NULL,
CONSTRAINT "PK_Enrollment" PRIMARY KEY ("EnrollmentID"),
CONSTRAINT "FK_Enrollment_Course_CourseID" FOREIGN KEY ("CourseID") REFERENCES "Course" ("CourseID") ON DELETE CASCADE,
CONSTRAINT "FK_Enrollment_Student_StudentID" FOREIGN KEY ("StudentID") REFERENCES "Student" ("ID") ON DELETE CASCADE
);
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (104ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
CREATE INDEX "IX_Enrollment_CourseID" ON "Enrollment" ("CourseID");
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (187ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
CREATE INDEX "IX_Enrollment_StudentID" ON "Enrollment" ("StudentID");
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (2ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
INSERT INTO "__EFMigrationsHistory" ("MigrationId", "ProductVersion")
VALUES ('20220525123835_InitialCreate', '6.0.2');
info: Microsoft.EntityFrameworkCore.Migrations[20402]
Applying migration '20220525130657_MaxLengthOnNames'.
Applying migration '20220525130657_MaxLengthOnNames'.
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (525ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
ALTER TABLE "Student" ALTER COLUMN "LastName" TYPE character varying(50);
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (175ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
ALTER TABLE "Student" ALTER COLUMN "FirstMidName" TYPE character varying(50);
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (1ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
INSERT INTO "__EFMigrationsHistory" ("MigrationId", "ProductVersion")
VALUES ('20220525130657_MaxLengthOnNames', '6.0.2');
Applying migration '20220525140736_ColumnFirstName'.
info: Microsoft.EntityFrameworkCore.Migrations[20402]
Applying migration '20220525140736_ColumnFirstName'.
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (1ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
ALTER TABLE "Student" RENAME COLUMN "FirstMidName" TO "FirstName";
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (0ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
INSERT INTO "__EFMigrationsHistory" ("MigrationId", "ProductVersion")
VALUES ('20220525140736_ColumnFirstName', '6.0.2');
Applying migration '20220526192225_ComplexDataModel'.info: Microsoft.EntityFrameworkCore.Migrations[20402]
Applying migration '20220526192225_ComplexDataModel'.
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (1ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
ALTER TABLE "Student" ALTER COLUMN "EnrollmentDate" DROP NOT NULL;
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (145ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
ALTER TABLE "Course" ALTER COLUMN "Title" TYPE character varying(50);
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (83ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
CREATE TABLE "Instructor" (
"ID" integer GENERATED BY DEFAULT AS IDENTITY,
"LastName" character varying(50) NOT NULL,
"FirstName" character varying(50) NOT NULL,
"HireDate" timestamp with time zone NULL,
CONSTRAINT "PK_Instructor" PRIMARY KEY ("ID")
);
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (70ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
CREATE TABLE "CourseAssignment" (
"InstructorID" integer NOT NULL,
"CourseID" integer NOT NULL,
CONSTRAINT "PK_CourseAssignment" PRIMARY KEY ("CourseID", "InstructorID"),
CONSTRAINT "FK_CourseAssignment_Course_CourseID" FOREIGN KEY ("CourseID") REFERENCES "Course" ("CourseID") ON DELETE CASCADE,
CONSTRAINT "FK_CourseAssignment_Instructor_InstructorID" FOREIGN KEY ("InstructorID") REFERENCES "Instructor" ("ID") ON DELETE CASCADE
);
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (93ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
CREATE TABLE "Department" (
"DepartmentID" integer GENERATED BY DEFAULT AS IDENTITY,
"Name" character varying(50) NOT NULL,
"Budget" money NOT NULL,
"StartDate" timestamp with time zone NOT NULL,
"InstructorID" integer NULL,
CONSTRAINT "PK_Department" PRIMARY KEY ("DepartmentID"),
CONSTRAINT "FK_Department_Instructor_InstructorID" FOREIGN KEY ("InstructorID") REFERENCES "Instructor" ("ID")
);
fail: Microsoft.EntityFrameworkCore.Database.Command[20102]
Failed executing DbCommand (6ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
INSERT INTO Department (Name, Budget, StartDate) VALUES ('Temp', 0.00, GETDATE())
Failed executing DbCommand (6ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
INSERT INTO Department (Name, Budget, StartDate) VALUES ('Temp', 0.00, GETDATE())
Npgsql.PostgresException (0x80004005): 42P01: relation "department" does not exist
POSITION: 13
at Npgsql.Internal.NpgsqlConnector.<ReadMessage>g__ReadMessageLong|213_0(NpgsqlConnector connector, Boolean async, DataRowLoadingMode dataRowLoadingMode, Boolean readingNotifications, Boolean isReadingPrependedMessage)
at Npgsql.NpgsqlDataReader.NextResult(Boolean async, Boolean isConsuming, CancellationToken cancellationToken)
at Npgsql.NpgsqlDataReader.NextResult()
at Npgsql.NpgsqlCommand.ExecuteReader(CommandBehavior behavior, Boolean async, CancellationToken cancellationToken)
at Npgsql.NpgsqlCommand.ExecuteReader(CommandBehavior behavior, Boolean async, CancellationToken cancellationToken)
at Npgsql.NpgsqlCommand.ExecuteNonQuery(Boolean async, CancellationToken cancellationToken)
at Npgsql.NpgsqlCommand.ExecuteNonQuery()
at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteNonQuery(RelationalCommandParameterObject parameterObject)
at Microsoft.EntityFrameworkCore.Migrations.MigrationCommand.ExecuteNonQuery(IRelationalConnection connection, IReadOnlyDictionary`2 parameterValues)
at Microsoft.EntityFrameworkCore.Migrations.Internal.MigrationCommandExecutor.ExecuteNonQuery(IEnumerable`1 migrationCommands, IRelationalConnection connection)
at Microsoft.EntityFrameworkCore.Migrations.Internal.Migrator.Migrate(String targetMigration)
at Microsoft.EntityFrameworkCore.Design.Internal.MigrationsOperations.UpdateDatabase(String targetMigration, String connectionString, String contextType)
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.UpdateDatabaseImpl(String targetMigration, String connectionString, String contextType)
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.UpdateDatabase.<>c__DisplayClass0_0.<.ctor>b__0()
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action)
Exception data:
Severity: ERROR
SqlState: 42P01
MessageText: relation "department" does not exist
Position: 13
File: parse_relation.c
Line: 1381
Routine: parserOpenTable
42P01: relation "department" does not exist
POSITION: 13
我不知道那个关系应该存在于何处，为什么不存在，你能帮帮我吗？
编辑：正如 Belayer 的
您创建了 table "Department"，但随后使用了 table Department。 它们不一样。 Postgres 将所有 non-doubled 带引号 ("...") 的标识符折叠为小写（与 SQL 将它们折叠为大写的标准相反）但在标识符被双引号时保持准确的大小写。但是，当使用双引号创建时，您必须 always 在引用时使用双引号。