71 lines
1.4 KiB
Kotlin
71 lines
1.4 KiB
Kotlin
package com.meloda.fast.database
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import android.database.Cursor
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import android.database.sqlite.SQLiteDatabase
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class QueryBuilder private constructor() {
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companion object {
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fun query(): QueryBuilder {
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return QueryBuilder()
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}
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}
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private val builder: StringBuilder = StringBuilder()
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fun select(column: String): QueryBuilder {
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builder.append("SELECT ")
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.append(column)
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.append(" ")
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return this
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}
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fun from(table: String): QueryBuilder {
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builder.append("FROM ")
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.append(table)
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.append(" ")
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return this
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}
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fun where(clause: String): QueryBuilder {
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builder.append("WHERE ")
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.append(clause)
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.append(" ")
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return this
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}
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fun leftJoin(table: String): QueryBuilder {
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builder.append("LEFT JOIN ")
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.append(table)
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.append(" ")
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return this
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}
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fun on(where: String): QueryBuilder {
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builder.append("ON ")
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.append(where)
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.append(" ")
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return this
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}
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fun and(): QueryBuilder {
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builder.append("AND ")
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return this
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}
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fun or(): QueryBuilder {
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builder.append("OR ")
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return this
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}
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fun asCursor(db: SQLiteDatabase): Cursor {
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return db.rawQuery(toString(), null)
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}
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override fun toString(): String {
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return builder.toString().trim()
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}
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} |