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466 lines
11 KiB
466 lines
11 KiB
package engine
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import (
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"testing"
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)
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func TestParseSQL_COUNT_Functions(t *testing.T) {
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tests := []struct {
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name string
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sql string
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wantErr bool
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validate func(t *testing.T, stmt Statement)
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}{
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{
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name: "COUNT(*) basic",
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sql: "SELECT COUNT(*) FROM test_table",
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wantErr: false,
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validate: func(t *testing.T, stmt Statement) {
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selectStmt, ok := stmt.(*SelectStatement)
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if !ok {
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t.Fatalf("Expected *SelectStatement, got %T", stmt)
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}
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if len(selectStmt.SelectExprs) != 1 {
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t.Fatalf("Expected 1 select expression, got %d", len(selectStmt.SelectExprs))
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}
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aliasedExpr, ok := selectStmt.SelectExprs[0].(*AliasedExpr)
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if !ok {
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t.Fatalf("Expected *AliasedExpr, got %T", selectStmt.SelectExprs[0])
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}
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funcExpr, ok := aliasedExpr.Expr.(*FuncExpr)
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if !ok {
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t.Fatalf("Expected *FuncExpr, got %T", aliasedExpr.Expr)
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}
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if funcExpr.Name.String() != "COUNT" {
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t.Errorf("Expected function name 'COUNT', got '%s'", funcExpr.Name.String())
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}
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if len(funcExpr.Exprs) != 1 {
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t.Fatalf("Expected 1 function argument, got %d", len(funcExpr.Exprs))
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}
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starExpr, ok := funcExpr.Exprs[0].(*StarExpr)
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if !ok {
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t.Errorf("Expected *StarExpr argument, got %T", funcExpr.Exprs[0])
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}
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_ = starExpr // Use the variable to avoid unused variable error
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},
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},
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{
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name: "COUNT(column_name)",
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sql: "SELECT COUNT(user_id) FROM users",
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wantErr: false,
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validate: func(t *testing.T, stmt Statement) {
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selectStmt, ok := stmt.(*SelectStatement)
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if !ok {
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t.Fatalf("Expected *SelectStatement, got %T", stmt)
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}
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aliasedExpr := selectStmt.SelectExprs[0].(*AliasedExpr)
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funcExpr := aliasedExpr.Expr.(*FuncExpr)
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if funcExpr.Name.String() != "COUNT" {
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t.Errorf("Expected function name 'COUNT', got '%s'", funcExpr.Name.String())
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}
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if len(funcExpr.Exprs) != 1 {
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t.Fatalf("Expected 1 function argument, got %d", len(funcExpr.Exprs))
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}
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argExpr, ok := funcExpr.Exprs[0].(*AliasedExpr)
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if !ok {
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t.Errorf("Expected *AliasedExpr argument, got %T", funcExpr.Exprs[0])
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}
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colName, ok := argExpr.Expr.(*ColName)
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if !ok {
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t.Errorf("Expected *ColName, got %T", argExpr.Expr)
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}
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if colName.Name.String() != "user_id" {
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t.Errorf("Expected column name 'user_id', got '%s'", colName.Name.String())
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}
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},
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},
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{
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name: "Multiple aggregate functions",
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sql: "SELECT COUNT(*), SUM(amount), AVG(score) FROM transactions",
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wantErr: false,
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validate: func(t *testing.T, stmt Statement) {
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selectStmt, ok := stmt.(*SelectStatement)
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if !ok {
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t.Fatalf("Expected *SelectStatement, got %T", stmt)
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}
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if len(selectStmt.SelectExprs) != 3 {
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t.Fatalf("Expected 3 select expressions, got %d", len(selectStmt.SelectExprs))
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}
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// Verify COUNT(*)
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countExpr := selectStmt.SelectExprs[0].(*AliasedExpr)
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countFunc := countExpr.Expr.(*FuncExpr)
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if countFunc.Name.String() != "COUNT" {
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t.Errorf("Expected first function to be COUNT, got %s", countFunc.Name.String())
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}
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// Verify SUM(amount)
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sumExpr := selectStmt.SelectExprs[1].(*AliasedExpr)
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sumFunc := sumExpr.Expr.(*FuncExpr)
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if sumFunc.Name.String() != "SUM" {
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t.Errorf("Expected second function to be SUM, got %s", sumFunc.Name.String())
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}
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// Verify AVG(score)
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avgExpr := selectStmt.SelectExprs[2].(*AliasedExpr)
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avgFunc := avgExpr.Expr.(*FuncExpr)
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if avgFunc.Name.String() != "AVG" {
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t.Errorf("Expected third function to be AVG, got %s", avgFunc.Name.String())
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}
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},
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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stmt, err := ParseSQL(tt.sql)
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if tt.wantErr {
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if err == nil {
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t.Errorf("Expected error, but got none")
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}
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return
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}
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if err != nil {
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t.Errorf("Unexpected error: %v", err)
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return
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}
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if tt.validate != nil {
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tt.validate(t, stmt)
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}
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})
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}
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}
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func TestParseSQL_SELECT_Expressions(t *testing.T) {
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tests := []struct {
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name string
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sql string
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wantErr bool
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validate func(t *testing.T, stmt Statement)
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}{
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{
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name: "SELECT * FROM table",
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sql: "SELECT * FROM users",
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wantErr: false,
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validate: func(t *testing.T, stmt Statement) {
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selectStmt := stmt.(*SelectStatement)
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if len(selectStmt.SelectExprs) != 1 {
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t.Fatalf("Expected 1 select expression, got %d", len(selectStmt.SelectExprs))
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}
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_, ok := selectStmt.SelectExprs[0].(*StarExpr)
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if !ok {
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t.Errorf("Expected *StarExpr, got %T", selectStmt.SelectExprs[0])
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}
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},
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},
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{
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name: "SELECT column FROM table",
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sql: "SELECT user_id FROM users",
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wantErr: false,
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validate: func(t *testing.T, stmt Statement) {
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selectStmt := stmt.(*SelectStatement)
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if len(selectStmt.SelectExprs) != 1 {
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t.Fatalf("Expected 1 select expression, got %d", len(selectStmt.SelectExprs))
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}
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aliasedExpr, ok := selectStmt.SelectExprs[0].(*AliasedExpr)
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if !ok {
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t.Fatalf("Expected *AliasedExpr, got %T", selectStmt.SelectExprs[0])
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}
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colName, ok := aliasedExpr.Expr.(*ColName)
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if !ok {
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t.Fatalf("Expected *ColName, got %T", aliasedExpr.Expr)
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}
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if colName.Name.String() != "user_id" {
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t.Errorf("Expected column name 'user_id', got '%s'", colName.Name.String())
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}
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},
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},
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{
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name: "SELECT multiple columns",
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sql: "SELECT user_id, name, email FROM users",
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wantErr: false,
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validate: func(t *testing.T, stmt Statement) {
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selectStmt := stmt.(*SelectStatement)
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if len(selectStmt.SelectExprs) != 3 {
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t.Fatalf("Expected 3 select expressions, got %d", len(selectStmt.SelectExprs))
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}
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expectedColumns := []string{"user_id", "name", "email"}
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for i, expected := range expectedColumns {
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aliasedExpr := selectStmt.SelectExprs[i].(*AliasedExpr)
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colName := aliasedExpr.Expr.(*ColName)
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if colName.Name.String() != expected {
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t.Errorf("Expected column %d to be '%s', got '%s'", i, expected, colName.Name.String())
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}
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}
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},
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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stmt, err := ParseSQL(tt.sql)
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if tt.wantErr {
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if err == nil {
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t.Errorf("Expected error, but got none")
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}
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return
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}
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if err != nil {
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t.Errorf("Unexpected error: %v", err)
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return
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}
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if tt.validate != nil {
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tt.validate(t, stmt)
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}
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})
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}
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}
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func TestParseSQL_WHERE_Clauses(t *testing.T) {
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tests := []struct {
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name string
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sql string
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wantErr bool
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validate func(t *testing.T, stmt Statement)
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}{
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{
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name: "WHERE with simple comparison",
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sql: "SELECT * FROM users WHERE age > 18",
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wantErr: false,
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validate: func(t *testing.T, stmt Statement) {
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selectStmt := stmt.(*SelectStatement)
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if selectStmt.Where == nil {
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t.Fatal("Expected WHERE clause, got nil")
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}
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// Just verify we have a WHERE clause with an expression
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if selectStmt.Where.Expr == nil {
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t.Error("Expected WHERE expression, got nil")
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}
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},
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},
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{
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name: "WHERE with AND condition",
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sql: "SELECT * FROM users WHERE age > 18 AND status = 'active'",
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wantErr: false,
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validate: func(t *testing.T, stmt Statement) {
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selectStmt := stmt.(*SelectStatement)
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if selectStmt.Where == nil {
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t.Fatal("Expected WHERE clause, got nil")
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}
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// Verify we have an AND expression
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andExpr, ok := selectStmt.Where.Expr.(*AndExpr)
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if !ok {
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t.Errorf("Expected *AndExpr, got %T", selectStmt.Where.Expr)
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}
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_ = andExpr // Use variable to avoid unused error
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},
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},
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{
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name: "WHERE with OR condition",
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sql: "SELECT * FROM users WHERE age < 18 OR age > 65",
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wantErr: false,
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validate: func(t *testing.T, stmt Statement) {
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selectStmt := stmt.(*SelectStatement)
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if selectStmt.Where == nil {
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t.Fatal("Expected WHERE clause, got nil")
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}
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// Verify we have an OR expression
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orExpr, ok := selectStmt.Where.Expr.(*OrExpr)
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if !ok {
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t.Errorf("Expected *OrExpr, got %T", selectStmt.Where.Expr)
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}
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_ = orExpr // Use variable to avoid unused error
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},
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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stmt, err := ParseSQL(tt.sql)
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if tt.wantErr {
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if err == nil {
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t.Errorf("Expected error, but got none")
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}
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return
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}
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if err != nil {
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t.Errorf("Unexpected error: %v", err)
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return
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}
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if tt.validate != nil {
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tt.validate(t, stmt)
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}
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})
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}
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}
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func TestParseSQL_LIMIT_Clauses(t *testing.T) {
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tests := []struct {
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name string
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sql string
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wantErr bool
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validate func(t *testing.T, stmt Statement)
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}{
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{
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name: "LIMIT with number",
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sql: "SELECT * FROM users LIMIT 10",
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wantErr: false,
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validate: func(t *testing.T, stmt Statement) {
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selectStmt := stmt.(*SelectStatement)
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if selectStmt.Limit == nil {
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t.Fatal("Expected LIMIT clause, got nil")
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}
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if selectStmt.Limit.Rowcount == nil {
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t.Error("Expected LIMIT rowcount, got nil")
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}
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sqlVal, ok := selectStmt.Limit.Rowcount.(*SQLVal)
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if !ok {
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t.Errorf("Expected *SQLVal, got %T", selectStmt.Limit.Rowcount)
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}
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if sqlVal.Type != IntVal {
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t.Errorf("Expected IntVal type, got %d", sqlVal.Type)
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}
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if string(sqlVal.Val) != "10" {
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t.Errorf("Expected limit value '10', got '%s'", string(sqlVal.Val))
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}
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},
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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stmt, err := ParseSQL(tt.sql)
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if tt.wantErr {
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if err == nil {
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t.Errorf("Expected error, but got none")
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}
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return
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}
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if err != nil {
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t.Errorf("Unexpected error: %v", err)
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return
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}
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if tt.validate != nil {
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tt.validate(t, stmt)
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}
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})
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}
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}
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func TestParseSQL_SHOW_Statements(t *testing.T) {
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tests := []struct {
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name string
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sql string
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wantErr bool
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validate func(t *testing.T, stmt Statement)
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}{
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{
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name: "SHOW DATABASES",
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sql: "SHOW DATABASES",
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wantErr: false,
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validate: func(t *testing.T, stmt Statement) {
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showStmt, ok := stmt.(*ShowStatement)
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if !ok {
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t.Fatalf("Expected *ShowStatement, got %T", stmt)
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}
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if showStmt.Type != "databases" {
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t.Errorf("Expected type 'databases', got '%s'", showStmt.Type)
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}
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},
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},
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{
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name: "SHOW TABLES",
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sql: "SHOW TABLES",
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wantErr: false,
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validate: func(t *testing.T, stmt Statement) {
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showStmt, ok := stmt.(*ShowStatement)
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if !ok {
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t.Fatalf("Expected *ShowStatement, got %T", stmt)
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}
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if showStmt.Type != "tables" {
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t.Errorf("Expected type 'tables', got '%s'", showStmt.Type)
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}
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},
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},
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{
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name: "SHOW TABLES FROM database",
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sql: "SHOW TABLES FROM \"test_db\"",
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wantErr: false,
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validate: func(t *testing.T, stmt Statement) {
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showStmt, ok := stmt.(*ShowStatement)
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if !ok {
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t.Fatalf("Expected *ShowStatement, got %T", stmt)
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}
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if showStmt.Type != "tables" {
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t.Errorf("Expected type 'tables', got '%s'", showStmt.Type)
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}
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if showStmt.Schema != "test_db" {
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t.Errorf("Expected schema 'test_db', got '%s'", showStmt.Schema)
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}
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},
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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stmt, err := ParseSQL(tt.sql)
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if tt.wantErr {
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if err == nil {
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t.Errorf("Expected error, but got none")
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}
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return
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}
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if err != nil {
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t.Errorf("Unexpected error: %v", err)
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return
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}
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if tt.validate != nil {
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tt.validate(t, stmt)
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}
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})
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}
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}
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