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https://gitee.com/dromara/mayfly-go
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refactor: dbm
This commit is contained in:
meilin.huang
226
server/internal/db/dbm/oracle/sqlgen.go
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226
server/internal/db/dbm/oracle/sqlgen.go
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@@ -0,0 +1,226 @@
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package oracle
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import (
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"fmt"
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"mayfly-go/internal/db/dbm/dbi"
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"mayfly-go/pkg/utils/collx"
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"strings"
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)
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type SQLGenerator struct {
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Dialect dbi.Dialect
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Metadata dbi.Metadata
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}
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func (sg *SQLGenerator) GenTableDDL(table dbi.Table, columns []dbi.Column, dropBeforeCreate bool) []string {
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quoter := sg.Dialect.Quoter()
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quote := quoter.Quote
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quoteTableName := quote(table.TableName)
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sqlArr := make([]string, 0)
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if dropBeforeCreate {
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dropSqlTmp := `
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declare
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num number;
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begin
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select count(1) into num from user_tables where table_name = '%s' and owner = (SELECT sys_context('USERENV', 'CURRENT_SCHEMA') FROM dual) ;
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if num > 0 then
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execute immediate 'drop table "%s"' ;
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end if;
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end`
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sqlArr = append(sqlArr, fmt.Sprintf(dropSqlTmp, table.TableName, table.TableName))
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}
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// 组装建表语句
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createSql := fmt.Sprintf("CREATE TABLE %s ( \n", quoteTableName)
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fields := make([]string, 0)
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pks := make([]string, 0)
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columnComments := make([]string, 0)
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// 把通用类型转换为达梦类型
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for _, column := range columns {
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if column.IsPrimaryKey {
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pks = append(pks, quote(column.ColumnName))
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}
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quote := quoter.Quote
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fields = append(fields, sg.genColumnBasicSql(quoter, column))
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// 防止注释内含有特殊字符串导致sql出错
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if column.ColumnComment != "" {
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comment := dbi.QuoteEscape(column.ColumnComment)
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columnComments = append(columnComments, fmt.Sprintf("COMMENT ON COLUMN %s.%s IS '%s'", quoteTableName, quote(column.ColumnName), comment))
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}
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}
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// 建表
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createSql += strings.Join(fields, ",\n")
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if len(pks) > 0 {
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createSql += fmt.Sprintf(", \nPRIMARY KEY (%s)", strings.Join(pks, ","))
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}
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createSql += "\n)"
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sqlArr = append(sqlArr, createSql)
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// 表注释
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tableCommentSql := ""
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if table.TableComment != "" {
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tableCommentSql = fmt.Sprintf("COMMENT ON TABLE %s is '%s'", quote(table.TableName), dbi.QuoteEscape(table.TableComment))
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sqlArr = append(sqlArr, tableCommentSql)
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}
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// 列注释
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if len(columnComments) > 0 {
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sqlArr = append(sqlArr, columnComments...)
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}
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otherSql := sg.GenerateTableOtherDDL(table, quoteTableName, columns)
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if len(otherSql) > 0 {
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sqlArr = append(sqlArr, otherSql...)
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}
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return sqlArr
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}
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func (sg *SQLGenerator) GenIndexDDL(table dbi.Table, indexs []dbi.Index) []string {
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sqls := make([]string, 0)
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comments := make([]string, 0)
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quote := sg.Dialect.Quoter().Quote
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for _, index := range indexs {
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unique := ""
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if index.IsUnique {
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unique = "unique"
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}
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// 取出列名，添加引号
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cols := strings.Split(index.ColumnName, ",")
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colNames := make([]string, len(cols))
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for i, name := range cols {
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colNames[i] = quote(name)
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}
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sqls = append(sqls, fmt.Sprintf("CREATE %s INDEX %s ON %s(%s)", unique, quote(index.IndexName), quote(table.TableName), strings.Join(colNames, ",")))
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}
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sqlArr := make([]string, 0)
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sqlArr = append(sqlArr, sqls...)
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if len(comments) > 0 {
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sqlArr = append(sqlArr, comments...)
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}
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return sqlArr
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}
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func (sg *SQLGenerator) GenInsert(tableName string, columns []dbi.Column, values [][]any, duplicateStrategy int) []string {
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quoter := sg.Dialect.Quoter()
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quote := quoter.Quote
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if duplicateStrategy == dbi.DuplicateStrategyNone {
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identityInsert := fmt.Sprintf("set identity_insert %s on;", quote(tableName))
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// 达梦数据库只能一条条的执行insert语句，所以这里需要将values拆分成多条insert语句
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return collx.ArrayMap(values, func(value []any) string {
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columnStr, valuesStrs := dbi.GenInsertSqlColumnAndValues(sg.Dialect, DbTypeOracle, columns, [][]any{value})
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return fmt.Sprintf("%s insert into %s (%s) values %s", identityInsert, quote(tableName), columnStr, strings.Join(valuesStrs, ",\n"))
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})
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}
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// 查询主键字段
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uniqueCols := make([]string, 0)
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caseSqls := make([]string, 0)
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metadata := sg.Metadata
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tableCols, _ := metadata.GetColumns(tableName)
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identityCols := make([]string, 0)
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for _, col := range tableCols {
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if col.IsPrimaryKey {
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uniqueCols = append(uniqueCols, col.ColumnName)
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caseSqls = append(caseSqls, fmt.Sprintf("( T1.%s = T2.%s )", quote(col.ColumnName), quote(col.ColumnName)))
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}
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if col.IsIdentity {
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// 自增字段不放入insert内，即使是设置了identity_insert on也不起作用
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identityCols = append(identityCols, quote(col.ColumnName))
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}
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}
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// 查询唯一索引涉及到的字段，并组装到match条件内
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indexs, _ := metadata.GetTableIndex(tableName)
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for _, index := range indexs {
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if index.IsUnique {
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cols := strings.Split(index.ColumnName, ",")
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tmp := make([]string, 0)
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for _, col := range cols {
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uniqueCols = append(uniqueCols, col)
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tmp = append(tmp, fmt.Sprintf(" T1.%s = T2.%s ", quote(col), quote(col)))
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}
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caseSqls = append(caseSqls, fmt.Sprintf("( %s )", strings.Join(tmp, " AND ")))
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}
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}
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// 重复数据处理策略
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phs := make([]string, 0)
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insertVals := make([]string, 0)
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upds := make([]string, 0)
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insertCols := make([]string, 0)
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for _, column := range columns {
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columnName := column.ColumnName
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phs = append(phs, fmt.Sprintf("? %s", columnName))
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if !collx.ArrayContains(uniqueCols, quoter.Trim(columnName)) {
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upds = append(upds, fmt.Sprintf("T1.%s = T2.%s", columnName, columnName))
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}
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if !collx.ArrayContains(identityCols, columnName) {
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insertCols = append(insertCols, columnName)
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insertVals = append(insertVals, fmt.Sprintf("T2.%s", columnName))
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}
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}
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t2s := make([]string, 0)
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for i := 0; i < len(values); i++ {
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t2s = append(t2s, fmt.Sprintf("SELECT %s FROM dual", strings.Join(phs, ",")))
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}
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t2 := strings.Join(t2s, " UNION ALL ")
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sqlTemp := "MERGE INTO " + quote(tableName) + " T1 USING (" + t2 + ") T2 ON " + strings.Join(caseSqls, " OR ")
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sqlTemp += "WHEN NOT MATCHED THEN INSERT (" + strings.Join(insertCols, ",") + ") VALUES (" + strings.Join(insertVals, ",") + ")"
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sqlTemp += "WHEN MATCHED THEN UPDATE SET " + strings.Join(upds, ",")
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return collx.AsArray(sqlTemp)
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}
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func (msg *SQLGenerator) genColumnBasicSql(quoter dbi.Quoter, column dbi.Column) string {
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colName := quoter.Quote(column.ColumnName)
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if column.IsIdentity {
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// 如果是自增，不需要设置默认值和空值，自增列数据类型必须是number
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return fmt.Sprintf(" %s NUMBER generated by default as IDENTITY", colName)
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}
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nullAble := ""
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if !column.Nullable {
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nullAble = " NOT NULL"
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}
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defVal := ""
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if column.ColumnDefault != "" {
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defVal = fmt.Sprintf(" DEFAULT %v", column.ColumnDefault)
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}
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columnSql := fmt.Sprintf(" %s %s%s%s", colName, column.GetColumnType(), defVal, nullAble)
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return columnSql
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}
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// 11g及以下版本会设置自增序列
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func (sg *SQLGenerator) GenerateTableOtherDDL(tableInfo dbi.Table, quoteTableName string, columns []dbi.Column) []string {
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return nil
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}
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// 11g及以下版本会设置自增序列和触发器
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func (sg *SQLGenerator) Oracle11GenerateTableOtherDDL(tableInfo dbi.Table, quoteTableName string, columns []dbi.Column) []string {
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result := make([]string, 0)
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for _, col := range columns {
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if col.IsIdentity {
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seqName := fmt.Sprintf("%s_%s_seq", tableInfo.TableName, col.ColumnName)
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trgName := fmt.Sprintf("%s_%s_trg", tableInfo.TableName, col.ColumnName)
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result = append(result, fmt.Sprintf("CREATE SEQUENCE %s START WITH 1 INCREMENT BY 1", seqName))
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result = append(result, fmt.Sprintf("CREATE OR REPLACE TRIGGER %s BEFORE INSERT ON %s FOR EACH ROW WHEN (NEW.%s IS NULL) BEGIN SELECT %s.nextval INTO :new.%s FROM dual; END", trgName, quoteTableName, col.ColumnName, seqName, col.ColumnName))
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}
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}
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return result
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}
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